DNSSEC Debugger

Back to Verisign Labs Tools

Domain Name:

Detail: more(+) / less(-)

Time: 2026-09-17 19:18:17 UTC

Analyzing DNSSEC problems for nic.cz

DS=20326/SHA-256 is now in the chain-of-trust

DS=38696/SHA-256 is now in the chain-of-trust

	Checking DS between Trust Anchor and .
	`. IN DS ( 20326 8 2 e06d44b80b8f1d39a95c0b0d7c65d08458e880409bbc683457104237c7f8ec8d )`
	`. IN DS ( 38696 8 2 683d2d0acb8c9b712a1948b27f741219298d0a450d612c483af444a4c0fb2b16 )`
	Query to e.root-servers.net for ./DNSKEY
	Received 1139 bytes from 192.203.230.10
	;; Response received from [192.203.230.10] 1139 octets ;; HEADER SECTION ;; id = 44965 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 4 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1472, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; . IN DNSKEY ;; ANSWER SECTION (4 records) . 172800 IN DNSKEY ( 256 3 8 AwEAAeCYD6Z7WWKVLeuWgowKP+3g+Gs1cnLKq7a3CaQxQpv8bfuFVI0WnG33qaSH/Mw9IBgifrdz f4XY/DQLnyBJ9MfaOyAWuEaEmYJ+GQPiwVVfstGwSA1McfFJUttTgq2Huu74KARhtA8wPo/N3Xcy YQtNhz+qCM5NBb3ecx/naw6sYab9LxS6f2cU0q03++BP5Ks0Uef8WJCa/1izCYE+vMkwoltV+tEN a3hpXiZ7jle/xdgaZrPi5ZGmyLVI34g1XVYrNlsCCTmNvFQIfzW5STFQFsQpizczyFn9r3LzSxxP CNwdlCG84bER0BmdwqbF6Tanv+FxMOavrahkj4wIy5k= ) ; keytag 57780 . 172800 IN DNSKEY ( 257 3 8 AwEAAaz/tAm8yTn4Mfeh5eyI96WSVexTBAvkMgJzkKTOiW1vkIbzxeF3+/4RgWOq7HrxRixHlFlE xOLAJr5emLvN7SWXgnLh4+B5xQlNVz8Og8kvArMtNROxVQuCaSnIDdD5LKyWbRd2n9WGe2R8PzgC mr3EgVLrjyBxWezF0jLHwVN8efS3rCj/EWgvIWgb9tarpVUDK/b58Da+sqqls3eNbuv7pr+eoZG+ SrDK6nWeL3c6H5Apxz7LjVc1uTIdsIXxuOLYA4/ilBmSVIzuDWfdRUfhHdY6+cn8HFRm+2hM8AnX GXws9555KrUB5qihylGa8subX2Nn6UwNR1AkUTV74bU= ) ; keytag 20326 . 172800 IN DNSKEY ( 257 3 8 AwEAAa96jeuknZlaeSrvyAJj6ZHv28hhOKkx3rLGXVaC6rXTsDc449/cidltpkyGwCJNnOAlFNKF 2jBosZBU5eeHspaQWOmOElZsjICMQMC3aeHbGiShvZsx4wMYSjH8e7Vrhbu6irwCzVBApESjbUdp WWmEnhathWu1jo+siFUiRAAxm9qyJNg/wOZqqzL/dL/q8PkcRU5oUKEpUge71M3ej2/7CPqpdVwu MoTvoB+ZOT4YeGyxMvHmbrxlFzGOHOijtzN+u1TQNatX2XBuzZNQ1K+s2CXkPIZo7s6JgZyvaBev YtxPvYLw4z9mR7K2vaF18UYH9Z9GNUUeayffKC73PYc= ) ; keytag 38696 . 172800 IN RRSIG ( DNSKEY 8 0 172800 20260930000000 20260909000000 20326 . oYSvB9Md+++cwEvRgKH+7O3u5mSWT8tgQ6zxO+A22wU/xfavUVWD6q0A4Tpr1ez840UhnuYEZll3 AoYA+Gv06zGip99UY71evaZ/cSG04Ipz2t6erwiKMbMVQDf4Cx25g28PTJjGuFG62BQxN9GOF8aT F+4KgY3/6kAoLiGVtALiW9d+Pa5LvbLicTif3qvus0u6c63BJ22rK8RXEKaXFD93TlyLprBR80Zv 4smHeqO5hVuVtwxq7/daXiv8laEVQfs9Joq/yjPxz7vaFbaJn00/LgpbpLG6r+y2GteVTLrtvT3v FrxfNH9b9NeYogbF7eUFujmm9TukkkjVxp5tKg== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	Found 3 DNSKEY records for .
	`. 172800 IN DNSKEY ( 256 3 8 AwEAAeCYD6Z7WWKVLeuWgowKP+3g+Gs1cnLKq7a3CaQxQpv8bfuFVI0WnG33qaSH/Mw9IBgifrdz f4XY/DQLnyBJ9MfaOyAWuEaEmYJ+GQPiwVVfstGwSA1McfFJUttTgq2Huu74KARhtA8wPo/N3Xcy YQtNhz+qCM5NBb3ecx/naw6sYab9LxS6f2cU0q03++BP5Ks0Uef8WJCa/1izCYE+vMkwoltV+tEN a3hpXiZ7jle/xdgaZrPi5ZGmyLVI34g1XVYrNlsCCTmNvFQIfzW5STFQFsQpizczyFn9r3LzSxxP CNwdlCG84bER0BmdwqbF6Tanv+FxMOavrahkj4wIy5k= ) ; keytag 57780`
	`. 172800 IN DNSKEY ( 257 3 8 AwEAAaz/tAm8yTn4Mfeh5eyI96WSVexTBAvkMgJzkKTOiW1vkIbzxeF3+/4RgWOq7HrxRixHlFlE xOLAJr5emLvN7SWXgnLh4+B5xQlNVz8Og8kvArMtNROxVQuCaSnIDdD5LKyWbRd2n9WGe2R8PzgC mr3EgVLrjyBxWezF0jLHwVN8efS3rCj/EWgvIWgb9tarpVUDK/b58Da+sqqls3eNbuv7pr+eoZG+ SrDK6nWeL3c6H5Apxz7LjVc1uTIdsIXxuOLYA4/ilBmSVIzuDWfdRUfhHdY6+cn8HFRm+2hM8AnX GXws9555KrUB5qihylGa8subX2Nn6UwNR1AkUTV74bU= ) ; keytag 20326`
	`. 172800 IN DNSKEY ( 257 3 8 AwEAAa96jeuknZlaeSrvyAJj6ZHv28hhOKkx3rLGXVaC6rXTsDc449/cidltpkyGwCJNnOAlFNKF 2jBosZBU5eeHspaQWOmOElZsjICMQMC3aeHbGiShvZsx4wMYSjH8e7Vrhbu6irwCzVBApESjbUdp WWmEnhathWu1jo+siFUiRAAxm9qyJNg/wOZqqzL/dL/q8PkcRU5oUKEpUge71M3ej2/7CPqpdVwu MoTvoB+ZOT4YeGyxMvHmbrxlFzGOHOijtzN+u1TQNatX2XBuzZNQ1K+s2CXkPIZo7s6JgZyvaBev YtxPvYLw4z9mR7K2vaF18UYH9Z9GNUUeayffKC73PYc= ) ; keytag 38696`
	DNSKEY=20326/SEP is now in the chain-of-trust
	DS=20326/SHA-256 verifies DNSKEY=20326/SEP
	DNSKEY=38696/SEP is now in the chain-of-trust
	DS=38696/SHA-256 verifies DNSKEY=38696/SEP
	Found 1 RRSIGs over DNSKEY RRset
	`. 172800 IN RRSIG ( DNSKEY 8 0 172800 20260930000000 20260909000000 20326 . oYSvB9Md+++cwEvRgKH+7O3u5mSWT8tgQ6zxO+A22wU/xfavUVWD6q0A4Tpr1ez840UhnuYEZll3 AoYA+Gv06zGip99UY71evaZ/cSG04Ipz2t6erwiKMbMVQDf4Cx25g28PTJjGuFG62BQxN9GOF8aT F+4KgY3/6kAoLiGVtALiW9d+Pa5LvbLicTif3qvus0u6c63BJ22rK8RXEKaXFD93TlyLprBR80Zv 4smHeqO5hVuVtwxq7/daXiv8laEVQfs9Joq/yjPxz7vaFbaJn00/LgpbpLG6r+y2GteVTLrtvT3v FrxfNH9b9NeYogbF7eUFujmm9TukkkjVxp5tKg== )`
	RRSIG=20326 and DNSKEY=20326/SEP verifies the DNSKEY RRset
	DNSKEY=57780 is now in the chain-of-trust
	Query to k.root-servers.net for nic.cz/A
	Received 613 bytes from 193.0.14.129
	;; Response received from [193.0.14.129] 613 octets ;; HEADER SECTION ;; id = 57842 ;; qr = 1 aa = 0 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 0 ;; nscount = 6 arcount = 9 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN A ;; ANSWER SECTION (0 records) ;; AUTHORITY SECTION (6 records) cz. 172800 IN NS a.ns.nic.cz. cz. 172800 IN NS b.ns.nic.cz. cz. 172800 IN NS c.ns.nic.cz. cz. 172800 IN NS d.ns.nic.cz. cz. 86400 IN DS ( 20237 13 2 cff0f3ecdbc529c1f0031ba1840bfb835853b9209ed1e508fff48451d7b778e2 ) cz. 86400 IN RRSIG ( DS 8 1 86400 20260930170000 20260917160000 57780 . jGRs1l4WkmDEEv6rn0GkRzP6P/96p0b2ItzqQMZqB8C3+JdxQun49VFeRLQoulEN/s3f65xSmgo9 lDyAafcuXx0UJ96ofRSTrr3aYexX4oZYpI/yV/mT/dWTSNdqpjn73R0XJSrn+mR47P+DnPUumlCY ZRiev85u3j2BS1sNlnvTGGT+/bcAtevfo/z3lLanmKVeXzPrjrx53to49SieHK7URXiQdWFkdg6N 8bTtZH6yy1cc7npB/+OZJfGo6wiiXylDVhLF0e3tqEOAACBDkJChN0zzss/KWhgNTQCkqozAFzp0 upsNCf+HMskHKhyzNsEbPuTzW841Oh2k1Nxndg== ) ;; ADDITIONAL SECTION (9 records) a.ns.nic.cz. 172800 IN A 194.0.12.1 a.ns.nic.cz. 172800 IN AAAA 2001:678:f::1 b.ns.nic.cz. 172800 IN A 194.0.13.1 b.ns.nic.cz. 172800 IN AAAA 2001:678:10::1 c.ns.nic.cz. 172800 IN A 194.0.14.1 c.ns.nic.cz. 172800 IN AAAA 2001:678:11::1 d.ns.nic.cz. 172800 IN A 193.29.206.1 d.ns.nic.cz. 172800 IN AAAA 2001:678:1::1 ;; { "EDNS-VERSION": 0 }
	Query to l.root-servers.net for cz/DNSKEY
	Received 613 bytes from 199.7.83.42
	;; Response received from [199.7.83.42] 613 octets ;; HEADER SECTION ;; id = 16229 ;; qr = 1 aa = 0 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 0 ;; nscount = 6 arcount = 9 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 4096, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; cz. IN DNSKEY ;; ANSWER SECTION (0 records) ;; AUTHORITY SECTION (6 records) cz. 172800 IN NS a.ns.nic.cz. cz. 172800 IN NS b.ns.nic.cz. cz. 172800 IN NS c.ns.nic.cz. cz. 172800 IN NS d.ns.nic.cz. cz. 86400 IN DS ( 20237 13 2 cff0f3ecdbc529c1f0031ba1840bfb835853b9209ed1e508fff48451d7b778e2 ) cz. 86400 IN RRSIG ( DS 8 1 86400 20260930170000 20260917160000 57780 . jGRs1l4WkmDEEv6rn0GkRzP6P/96p0b2ItzqQMZqB8C3+JdxQun49VFeRLQoulEN/s3f65xSmgo9 lDyAafcuXx0UJ96ofRSTrr3aYexX4oZYpI/yV/mT/dWTSNdqpjn73R0XJSrn+mR47P+DnPUumlCY ZRiev85u3j2BS1sNlnvTGGT+/bcAtevfo/z3lLanmKVeXzPrjrx53to49SieHK7URXiQdWFkdg6N 8bTtZH6yy1cc7npB/+OZJfGo6wiiXylDVhLF0e3tqEOAACBDkJChN0zzss/KWhgNTQCkqozAFzp0 upsNCf+HMskHKhyzNsEbPuTzW841Oh2k1Nxndg== ) ;; ADDITIONAL SECTION (9 records) a.ns.nic.cz. 172800 IN A 194.0.12.1 b.ns.nic.cz. 172800 IN A 194.0.13.1 c.ns.nic.cz. 172800 IN A 194.0.14.1 d.ns.nic.cz. 172800 IN A 193.29.206.1 a.ns.nic.cz. 172800 IN AAAA 2001:678:f::1 b.ns.nic.cz. 172800 IN AAAA 2001:678:10::1 c.ns.nic.cz. 172800 IN AAAA 2001:678:11::1 d.ns.nic.cz. 172800 IN AAAA 2001:678:1::1 ;; { "EDNS-VERSION": 0 }
	Found child zone cz

	Checking DS between . and cz
	Query to k.root-servers.net for cz/DS
	Received 366 bytes from 193.0.14.129
	;; Response received from [193.0.14.129] 366 octets ;; HEADER SECTION ;; id = 9487 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 2 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; cz. IN DS ;; ANSWER SECTION (2 records) cz. 86400 IN DS ( 20237 13 2 cff0f3ecdbc529c1f0031ba1840bfb835853b9209ed1e508fff48451d7b778e2 ) cz. 86400 IN RRSIG ( DS 8 1 86400 20260930170000 20260917160000 57780 . jGRs1l4WkmDEEv6rn0GkRzP6P/96p0b2ItzqQMZqB8C3+JdxQun49VFeRLQoulEN/s3f65xSmgo9 lDyAafcuXx0UJ96ofRSTrr3aYexX4oZYpI/yV/mT/dWTSNdqpjn73R0XJSrn+mR47P+DnPUumlCY ZRiev85u3j2BS1sNlnvTGGT+/bcAtevfo/z3lLanmKVeXzPrjrx53to49SieHK7URXiQdWFkdg6N 8bTtZH6yy1cc7npB/+OZJfGo6wiiXylDVhLF0e3tqEOAACBDkJChN0zzss/KWhgNTQCkqozAFzp0 upsNCf+HMskHKhyzNsEbPuTzW841Oh2k1Nxndg== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	Found 1 DS records for cz in the . zone
	DS=20237/SHA-256 has algorithm ECDSAP256SHA256
	Found 1 RRSIGs over DS RRset
	`cz. 86400 IN RRSIG ( DS 8 1 86400 20260930170000 20260917160000 57780 . jGRs1l4WkmDEEv6rn0GkRzP6P/96p0b2ItzqQMZqB8C3+JdxQun49VFeRLQoulEN/s3f65xSmgo9 lDyAafcuXx0UJ96ofRSTrr3aYexX4oZYpI/yV/mT/dWTSNdqpjn73R0XJSrn+mR47P+DnPUumlCY ZRiev85u3j2BS1sNlnvTGGT+/bcAtevfo/z3lLanmKVeXzPrjrx53to49SieHK7URXiQdWFkdg6N 8bTtZH6yy1cc7npB/+OZJfGo6wiiXylDVhLF0e3tqEOAACBDkJChN0zzss/KWhgNTQCkqozAFzp0 upsNCf+HMskHKhyzNsEbPuTzW841Oh2k1Nxndg== )`
	RRSIG=57780 and DNSKEY=57780 verifies the DS RRset
	DS=20237/SHA-256 is now in the chain-of-trust
	`cz. 86400 IN DS ( 20237 13 2 cff0f3ecdbc529c1f0031ba1840bfb835853b9209ed1e508fff48451d7b778e2 )`
	Query to b.ns.nic.cz for cz/DNSKEY
	Received 289 bytes from 194.0.13.1
	;; Response received from [194.0.13.1] 289 octets ;; HEADER SECTION ;; id = 59038 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 3 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; cz. IN DNSKEY ;; ANSWER SECTION (3 records) cz. 3600 IN DNSKEY ( 256 3 13 MU4HRTdetkGZ4r6c3WQprXG5RVX35T90xOSvj6nL7/RMnAAhYVREf5967kwwt3VnJR5vnye0FbbP D4oma83mTw== ) ; keytag 10850 cz. 3600 IN DNSKEY ( 257 3 13 nqzH7xP1QU5UOVy/VvxFSlrB/XgX9JDJzj51PzIj35TXjZTyalTlAT/f7PAfaSD5mEG1N8Vk9NmI 2nxgQqhzDQ== ) ; keytag 20237 cz. 3600 IN RRSIG ( DNSKEY 13 1 3600 20260929122134 20260915105134 20237 cz. 67HhT2uh1F28eNWHhw55FGUWNE7somLs2U7wjIHYdZGxuzwbJdwaA+AnXMGkVCyH1n3FQiDjYr6U m0ThluAOAg== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	Found 2 DNSKEY records for cz
	`cz. 3600 IN DNSKEY ( 256 3 13 MU4HRTdetkGZ4r6c3WQprXG5RVX35T90xOSvj6nL7/RMnAAhYVREf5967kwwt3VnJR5vnye0FbbP D4oma83mTw== ) ; keytag 10850`
	`cz. 3600 IN DNSKEY ( 257 3 13 nqzH7xP1QU5UOVy/VvxFSlrB/XgX9JDJzj51PzIj35TXjZTyalTlAT/f7PAfaSD5mEG1N8Vk9NmI 2nxgQqhzDQ== ) ; keytag 20237`
	DNSKEY=20237/SEP is now in the chain-of-trust
	DS=20237/SHA-256 verifies DNSKEY=20237/SEP
	Found 1 RRSIGs over DNSKEY RRset
	`cz. 3600 IN RRSIG ( DNSKEY 13 1 3600 20260929122134 20260915105134 20237 cz. 67HhT2uh1F28eNWHhw55FGUWNE7somLs2U7wjIHYdZGxuzwbJdwaA+AnXMGkVCyH1n3FQiDjYr6U m0ThluAOAg== )`
	RRSIG=20237 and DNSKEY=20237/SEP verifies the DNSKEY RRset
	DNSKEY=10850 is now in the chain-of-trust
	Query to a.ns.nic.cz for nic.cz/A
	Received 153 bytes from 194.0.12.1
	;; Response received from [194.0.12.1] 153 octets ;; HEADER SECTION ;; id = 25782 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 2 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN A ;; ANSWER SECTION (2 records) nic.cz. 1800 IN A 217.31.205.50 nic.cz. 1800 IN RRSIG ( A 13 2 1800 20260927025554 20260913012554 178 nic.cz. GH8XqfonZNBmPlYPFHs7IAgQ0qqOeRrpssXZfbQWYfnOiyUXWaHB3x8kXOMov0sESrzBNkI4MGNo 1btpH3Deiw== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	a.ns.nic.cz is authoritative for nic.cz
	Query to b.ns.nic.cz for nic.cz/DNSKEY
	Received 297 bytes from 194.0.13.1
	;; Response received from [194.0.13.1] 297 octets ;; HEADER SECTION ;; id = 62866 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 3 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN DNSKEY ;; ANSWER SECTION (3 records) nic.cz. 1800 IN DNSKEY ( 256 3 13 Gv9MvVsUd9NAV2t1pLUF5qiFwUaV87pGryu6MzAKtRsQ7BzokdEx/Gz5QiPYV3Z3UbxvNeouHn/g P8IxkBd3VQ== ) ; keytag 178 nic.cz. 1800 IN DNSKEY ( 257 3 13 Hpu4xfZJ43G2gen4cJOZ4DFhaXFaMxLPa+dBceqkbdIaqADX9JLHW/CNpPV+GtgAMc2kHgNEJTaS AUhYG41tvQ== ) ; keytag 37589 nic.cz. 1800 IN RRSIG ( DNSKEY 13 2 1800 20260927042554 20260913025554 37589 nic.cz. M1/GZnG0oVUw7GEsoW91jhMZWqhS7/VbZX1YdsHR2LrOxaqwg3YLBVPaiQC0u8PsjQNZGDW92/b2 d7RjdxWYtA== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	Found child zone nic.cz
	Attempting to learn nameservers for nic.cz
	Query to a.ns.nic.cz for nic.cz/NS
	Received 932 bytes from 194.0.12.1
	;; Response received from [194.0.12.1] 932 octets ;; HEADER SECTION ;; id = 54881 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 4 ;; nscount = 0 arcount = 13 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN NS ;; ANSWER SECTION (4 records) nic.cz. 1800 IN NS a.ns.nic.cz. nic.cz. 1800 IN NS b.ns.nic.cz. nic.cz. 1800 IN NS d.ns.nic.cz. nic.cz. 1800 IN RRSIG ( NS 13 2 1800 20260927025554 20260913012554 178 nic.cz. b3a3GGkDIsKymuDB795PExNpc/iJm83gl5w5iFlElOPctzJC8QHOdUfAGIqCx+urDYnR8S+Pfa0K xQS3oE1IlQ== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (13 records) a.ns.nic.cz. 1800 IN A 194.0.12.1 a.ns.nic.cz. 1800 IN AAAA 2001:678:f::1 b.ns.nic.cz. 1800 IN A 194.0.13.1 b.ns.nic.cz. 1800 IN AAAA 2001:678:10::1 d.ns.nic.cz. 1800 IN A 193.29.206.1 d.ns.nic.cz. 1800 IN AAAA 2001:678:1::1 a.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. K4M6pFKZDPnVascvddUwrNJBcJJpeGKVPhsdUP1qqc6yX2HcI6FcZMAiZ04BnEIN6z9e7yxNIA5y JCdkGdhnMg== ) a.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. 2L9yKI0nYWztkWN2Tym9pNSBxf5rXPif1ayNShQZjNKV4Hr3LGTHfm5fl7O5nzRLoXhrBOXIL0Wf L1Fub4sCIA== ) b.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. r7z1CL0IHLX5u/JLJ78nN+O9pedKY+sooOEQ2JPLBR/YZgIjjbQhT2GCohFfRMS+KK8Q/jOW2F/V DlCHZPB6Jw== ) b.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. fN8Tt6io0birhkvb6A9tRdkEkUH0WoV9ZdUPeu0FvjDW8wzxhMHnZxe5NPT17FNRCStMxohRW3ac k9UDCC8qqw== ) d.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. oX4a7TRePaAvKaTjLHlra1U/4CaVAEDGPdfBNR8ahOLCawXwzlg84RftQ7IXJAZvwWwNre7N9qbL Gy8TFp20/A== ) d.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. cf64caDrLnvG6hDHaHjS5OVoxj0cqDnkkCDc1o6XBFVUZevypK7BnfSbHB66aGAACEOiDKyMmDRm Aslv2E3aYQ== ) ;; { "EDNS-VERSION": 0 }
	Found nic.cz nameservers: a.ns.nic.cz, b.ns.nic.cz, d.ns.nic.cz

nic.cz

	Checking DS between cz and nic.cz
	Query to b.ns.nic.cz for nic.cz/DS
	Received 181 bytes from 194.0.13.1
	;; Response received from [194.0.13.1] 181 octets ;; HEADER SECTION ;; id = 50445 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 2 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN DS ;; ANSWER SECTION (2 records) nic.cz. 3600 IN DS ( 37589 13 2 262c8836d7309544dd6211d62b508fe5da99b63ccaf7a22434ed28bfceb56693 ) nic.cz. 3600 IN RRSIG ( DS 13 2 3600 20260923171726 20260909154726 10850 cz. 4tZjgXgs53BA485XFxzIUrtdaHXL3jRv1ndeVecCQDBBYHULqGLbFYJE+uXjWg7iug7shJZAd5Qb X4UDOEsR1g== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	Found 1 DS records for nic.cz in the cz zone
	DS=37589/SHA-256 has algorithm ECDSAP256SHA256
	Found 1 RRSIGs over DS RRset
	`nic.cz. 3600 IN RRSIG ( DS 13 2 3600 20260923171726 20260909154726 10850 cz. 4tZjgXgs53BA485XFxzIUrtdaHXL3jRv1ndeVecCQDBBYHULqGLbFYJE+uXjWg7iug7shJZAd5Qb X4UDOEsR1g== )`
	RRSIG=10850 and DNSKEY=10850 verifies the DS RRset
	DS=37589/SHA-256 is now in the chain-of-trust
	`nic.cz. 3600 IN DS ( 37589 13 2 262c8836d7309544dd6211d62b508fe5da99b63ccaf7a22434ed28bfceb56693 )`
	Query to d.ns.nic.cz for nic.cz/DNSKEY
	Received 297 bytes from 193.29.206.1
	;; Response received from [193.29.206.1] 297 octets ;; HEADER SECTION ;; id = 62458 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 3 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN DNSKEY ;; ANSWER SECTION (3 records) nic.cz. 1800 IN DNSKEY ( 257 3 13 Hpu4xfZJ43G2gen4cJOZ4DFhaXFaMxLPa+dBceqkbdIaqADX9JLHW/CNpPV+GtgAMc2kHgNEJTaS AUhYG41tvQ== ) ; keytag 37589 nic.cz. 1800 IN DNSKEY ( 256 3 13 Gv9MvVsUd9NAV2t1pLUF5qiFwUaV87pGryu6MzAKtRsQ7BzokdEx/Gz5QiPYV3Z3UbxvNeouHn/g P8IxkBd3VQ== ) ; keytag 178 nic.cz. 1800 IN RRSIG ( DNSKEY 13 2 1800 20260927042554 20260913025554 37589 nic.cz. M1/GZnG0oVUw7GEsoW91jhMZWqhS7/VbZX1YdsHR2LrOxaqwg3YLBVPaiQC0u8PsjQNZGDW92/b2 d7RjdxWYtA== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	Found 2 DNSKEY records for nic.cz
	`nic.cz. 1800 IN DNSKEY ( 257 3 13 Hpu4xfZJ43G2gen4cJOZ4DFhaXFaMxLPa+dBceqkbdIaqADX9JLHW/CNpPV+GtgAMc2kHgNEJTaS AUhYG41tvQ== ) ; keytag 37589`
	`nic.cz. 1800 IN DNSKEY ( 256 3 13 Gv9MvVsUd9NAV2t1pLUF5qiFwUaV87pGryu6MzAKtRsQ7BzokdEx/Gz5QiPYV3Z3UbxvNeouHn/g P8IxkBd3VQ== ) ; keytag 178`
	DNSKEY=37589/SEP is now in the chain-of-trust
	DS=37589/SHA-256 verifies DNSKEY=37589/SEP
	Found 1 RRSIGs over DNSKEY RRset
	`nic.cz. 1800 IN RRSIG ( DNSKEY 13 2 1800 20260927042554 20260913025554 37589 nic.cz. M1/GZnG0oVUw7GEsoW91jhMZWqhS7/VbZX1YdsHR2LrOxaqwg3YLBVPaiQC0u8PsjQNZGDW92/b2 d7RjdxWYtA== )`
	RRSIG=37589 and DNSKEY=37589/SEP verifies the DNSKEY RRset
	DNSKEY=178 is now in the chain-of-trust
	Query to a.ns.nic.cz for nic.cz/A
	a.ns.nic.cz is authoritative for nic.cz
	Found RRSIG signed by nic.cz zone
	Query to b.ns.nic.cz for nic.cz/SOA
	Received 189 bytes from 194.0.13.1
	;; Response received from [194.0.13.1] 189 octets ;; HEADER SECTION ;; id = 20747 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 2 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN SOA ;; ANSWER SECTION (2 records) nic.cz. 1800 IN SOA ( a.ns.nic.cz. hostmaster.nic.cz. 1789632089 ;serial 14400 ;refresh 3600 ;retry 1209600 ;expire 7200 ;minimum ) nic.cz. 1800 IN RRSIG ( SOA 13 2 1800 20261001080129 20260917063129 178 nic.cz. vw5Wuh3NTBVJqktUwIkp1nChJrYdu95m9Iu7LVNwaCzv1uHS4xSS5fUpfNq+eaCzOPD15IrbSMLF VFa3X3HSXQ== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	Query to d.ns.nic.cz for nic.cz/SOA
	Received 1081 bytes from 193.29.206.1
	;; Response received from [193.29.206.1] 1081 octets ;; HEADER SECTION ;; id = 53566 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 2 ;; nscount = 4 arcount = 13 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN SOA ;; ANSWER SECTION (2 records) nic.cz. 1800 IN SOA ( a.ns.nic.cz. hostmaster.nic.cz. 1789632089 ;serial 14400 ;refresh 3600 ;retry 1209600 ;expire 7200 ;minimum ) nic.cz. 1800 IN RRSIG ( SOA 13 2 1800 20261001080129 20260917063129 178 nic.cz. vw5Wuh3NTBVJqktUwIkp1nChJrYdu95m9Iu7LVNwaCzv1uHS4xSS5fUpfNq+eaCzOPD15IrbSMLF VFa3X3HSXQ== ) ;; AUTHORITY SECTION (4 records) nic.cz. 1800 IN NS a.ns.nic.cz. nic.cz. 1800 IN NS b.ns.nic.cz. nic.cz. 1800 IN NS d.ns.nic.cz. nic.cz. 1800 IN RRSIG ( NS 13 2 1800 20260927025554 20260913012554 178 nic.cz. b3a3GGkDIsKymuDB795PExNpc/iJm83gl5w5iFlElOPctzJC8QHOdUfAGIqCx+urDYnR8S+Pfa0K xQS3oE1IlQ== ) ;; ADDITIONAL SECTION (13 records) a.ns.nic.cz. 1800 IN A 194.0.12.1 b.ns.nic.cz. 1800 IN A 194.0.13.1 d.ns.nic.cz. 1800 IN A 193.29.206.1 a.ns.nic.cz. 1800 IN AAAA 2001:678:f::1 b.ns.nic.cz. 1800 IN AAAA 2001:678:10::1 d.ns.nic.cz. 1800 IN AAAA 2001:678:1::1 a.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. K4M6pFKZDPnVascvddUwrNJBcJJpeGKVPhsdUP1qqc6yX2HcI6FcZMAiZ04BnEIN6z9e7yxNIA5y JCdkGdhnMg== ) a.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. 2L9yKI0nYWztkWN2Tym9pNSBxf5rXPif1ayNShQZjNKV4Hr3LGTHfm5fl7O5nzRLoXhrBOXIL0Wf L1Fub4sCIA== ) b.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. r7z1CL0IHLX5u/JLJ78nN+O9pedKY+sooOEQ2JPLBR/YZgIjjbQhT2GCohFfRMS+KK8Q/jOW2F/V DlCHZPB6Jw== ) b.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. fN8Tt6io0birhkvb6A9tRdkEkUH0WoV9ZdUPeu0FvjDW8wzxhMHnZxe5NPT17FNRCStMxohRW3ac k9UDCC8qqw== ) d.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. oX4a7TRePaAvKaTjLHlra1U/4CaVAEDGPdfBNR8ahOLCawXwzlg84RftQ7IXJAZvwWwNre7N9qbL Gy8TFp20/A== ) d.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. cf64caDrLnvG6hDHaHjS5OVoxj0cqDnkkCDc1o6XBFVUZevypK7BnfSbHB66aGAACEOiDKyMmDRm Aslv2E3aYQ== ) ;; { "EDNS-VERSION": 0 }
	Query to a.ns.nic.cz for nic.cz/A
	nic.cz A RR has value 217.31.205.50
	Found 1 RRSIGs over A RRset
	`nic.cz. 1800 IN RRSIG ( A 13 2 1800 20260927025554 20260913012554 178 nic.cz. GH8XqfonZNBmPlYPFHs7IAgQ0qqOeRrpssXZfbQWYfnOiyUXWaHB3x8kXOMov0sESrzBNkI4MGNo 1btpH3Deiw== )`
	RRSIG=178 and DNSKEY=178 verifies the A RRset

nic.cz

	Query to b.ns.nic.cz for nic.cz/A
	Received 153 bytes from 194.0.13.1
	;; Response received from [194.0.13.1] 153 octets ;; HEADER SECTION ;; id = 15751 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 2 ;; nscount = 0 arcount = 1 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN A ;; ANSWER SECTION (2 records) nic.cz. 1800 IN A 217.31.205.50 nic.cz. 1800 IN RRSIG ( A 13 2 1800 20260927025554 20260913012554 178 nic.cz. GH8XqfonZNBmPlYPFHs7IAgQ0qqOeRrpssXZfbQWYfnOiyUXWaHB3x8kXOMov0sESrzBNkI4MGNo 1btpH3Deiw== ) ;; AUTHORITY SECTION (0 records) ;; ADDITIONAL SECTION (1 record) ;; { "EDNS-VERSION": 0 }
	b.ns.nic.cz is authoritative for nic.cz
	Found RRSIG signed by nic.cz zone
	Query to b.ns.nic.cz for nic.cz/A
	nic.cz A RR has value 217.31.205.50
	Found 1 RRSIGs over A RRset
	`nic.cz. 1800 IN RRSIG ( A 13 2 1800 20260927025554 20260913012554 178 nic.cz. GH8XqfonZNBmPlYPFHs7IAgQ0qqOeRrpssXZfbQWYfnOiyUXWaHB3x8kXOMov0sESrzBNkI4MGNo 1btpH3Deiw== )`
	RRSIG=178 and DNSKEY=178 verifies the A RRset

nic.cz

	Query to d.ns.nic.cz for nic.cz/A
	Received 1050 bytes from 193.29.206.1
	;; Response received from [193.29.206.1] 1050 octets ;; HEADER SECTION ;; id = 27570 ;; qr = 1 aa = 1 tc = 0 rd = 0 opcode = QUERY ;; ra = 0 z = 0 ad = 0 cd = 0 rcode = NOERROR ;; do = 1 co = 0 ;; qdcount = 1 ancount = 2 ;; nscount = 4 arcount = 13 ;; { "EDNS-VERSION": 0, ;; "FLAGS": "8000", ;; "RCODE": 0, ;; "UDPSIZE": 1232, ;; "OPTIONS": [ ] ;; } ;; QUESTION SECTION (1 record) ;; nic.cz. IN A ;; ANSWER SECTION (2 records) nic.cz. 1800 IN A 217.31.205.50 nic.cz. 1800 IN RRSIG ( A 13 2 1800 20260927025554 20260913012554 178 nic.cz. GH8XqfonZNBmPlYPFHs7IAgQ0qqOeRrpssXZfbQWYfnOiyUXWaHB3x8kXOMov0sESrzBNkI4MGNo 1btpH3Deiw== ) ;; AUTHORITY SECTION (4 records) nic.cz. 1800 IN NS b.ns.nic.cz. nic.cz. 1800 IN NS d.ns.nic.cz. nic.cz. 1800 IN NS a.ns.nic.cz. nic.cz. 1800 IN RRSIG ( NS 13 2 1800 20260927025554 20260913012554 178 nic.cz. b3a3GGkDIsKymuDB795PExNpc/iJm83gl5w5iFlElOPctzJC8QHOdUfAGIqCx+urDYnR8S+Pfa0K xQS3oE1IlQ== ) ;; ADDITIONAL SECTION (13 records) a.ns.nic.cz. 1800 IN A 194.0.12.1 b.ns.nic.cz. 1800 IN A 194.0.13.1 d.ns.nic.cz. 1800 IN A 193.29.206.1 a.ns.nic.cz. 1800 IN AAAA 2001:678:f::1 b.ns.nic.cz. 1800 IN AAAA 2001:678:10::1 d.ns.nic.cz. 1800 IN AAAA 2001:678:1::1 a.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. K4M6pFKZDPnVascvddUwrNJBcJJpeGKVPhsdUP1qqc6yX2HcI6FcZMAiZ04BnEIN6z9e7yxNIA5y JCdkGdhnMg== ) a.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. 2L9yKI0nYWztkWN2Tym9pNSBxf5rXPif1ayNShQZjNKV4Hr3LGTHfm5fl7O5nzRLoXhrBOXIL0Wf L1Fub4sCIA== ) b.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. r7z1CL0IHLX5u/JLJ78nN+O9pedKY+sooOEQ2JPLBR/YZgIjjbQhT2GCohFfRMS+KK8Q/jOW2F/V DlCHZPB6Jw== ) b.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. fN8Tt6io0birhkvb6A9tRdkEkUH0WoV9ZdUPeu0FvjDW8wzxhMHnZxe5NPT17FNRCStMxohRW3ac k9UDCC8qqw== ) d.ns.nic.cz. 1800 IN RRSIG ( A 13 4 1800 20260927025554 20260913012554 178 nic.cz. oX4a7TRePaAvKaTjLHlra1U/4CaVAEDGPdfBNR8ahOLCawXwzlg84RftQ7IXJAZvwWwNre7N9qbL Gy8TFp20/A== ) d.ns.nic.cz. 1800 IN RRSIG ( AAAA 13 4 1800 20260927025554 20260913012554 178 nic.cz. cf64caDrLnvG6hDHaHjS5OVoxj0cqDnkkCDc1o6XBFVUZevypK7BnfSbHB66aGAACEOiDKyMmDRm Aslv2E3aYQ== ) ;; { "EDNS-VERSION": 0 }
	d.ns.nic.cz is authoritative for nic.cz
	Found RRSIG signed by nic.cz zone
	Query to d.ns.nic.cz for nic.cz/A
	nic.cz A RR has value 217.31.205.50
	Found 1 RRSIGs over A RRset
	`nic.cz. 1800 IN RRSIG ( A 13 2 1800 20260927025554 20260913012554 178 nic.cz. GH8XqfonZNBmPlYPFHs7IAgQ0qqOeRrpssXZfbQWYfnOiyUXWaHB3x8kXOMov0sESrzBNkI4MGNo 1btpH3Deiw== )`
	RRSIG=178 and DNSKEY=178 verifies the A RRset

Move your mouse over any or symbols for remediation hints.

Want a second opinion? Test nic.cz at dnsviz.net.

DNSSEC Debugger

↓ Advanced options ↑ Advanced options

Trust Anchor:
Name Servers: