dnscheck.labs.nic.cz
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:b9:52:86:eb:77:f6:b5:c6:55:51:25:db:c7:0c:58:eb:3e was issued on by Let's Encrypt.
This certificate has already expired and will cause a warning or error message in the browser it's still listed on this site to allow you to look back on previously issued certificates. If we have found any compliance issues with this certificate they will be shown below. I hope this certificate review is providing you the detailed information in a simple form you where looking for.
We have idenified some issues with this certificate:
- Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)
Certificate Subject
CN=dnscheck.labs.nic.cz
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:b9:52:86:eb:77:f6:b5:c6:55:51:25:db:c7:0c:58:eb:3eSerial Number (int): 324398792914958523711008127259743136312126
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 0b:cf:f9:15:97:98:1d:3e:24:26:a7:a5:ff:53:8e:5f:6a:0d:27:1f
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 69:a0:17:59:8a:17:15:c0:83:5d:76:a8:f3:f7:25:c2:66:51:d0:2f
Fingerprint (sha256): 14:31:e1:86:75:b1:68:fd:39:88:f9:15:be:62:22:ab:67:9c:f5:f5:33:cf:91:15:17:14:07:c3:da:93:9b:bb
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate dnscheck.labs.nic.cz
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for dnscheck.labs.nic.cz
Public Key Algorithm
RSA
Key Size
4096
Signature Algorithm
SHA256 with RSA
Key Usage
Digital Signature
Key Encipherment
Extended Key Usages
Server Authentication
Client Authentication
Extensions
9 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
dnscheck.labs.nic.cz
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Certificate
The complete raw certificate details for dnscheck.labs.nic.cz in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGYDCCBUigAwIBAgISA7lShut39rXGVVEl28cMWOs+MA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTExMjAxMzAzMTVaFw0y MDAyMTgxMzAzMTVaMB8xHTAbBgNVBAMTFGRuc2NoZWNrLmxhYnMubmljLmN6MIIC IjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAxCXDQKAnBFCj2zoJdxS7VSBX KiKHlrhbt82MxUsXxcBSwPx0ReQz6Y4OXWhBKilzP9gzFQzt3sXFoWJXVYwa/B9t b/ioGmxWV2p7at2bHpaLZkRbPn9aybeKZ60OEs1m0DD93IHKSbt1/D4aJm3xUX9R so4bgXKStjN/cBQEgHUjbBraWiUNkI6Kj93OvSfSq+i21+GIyboviIt5GZ6S5CYu XQxfSbofxa7+pUeyKdY4ANbFzZ/Bqz0/gfzfA/O1225SDGW3loDch8FmHxzX13vm R1Cn7X7lviiyRAJugjo79EvSU5oZGqGL1RR4jxFCx5dKQOyzB4Go/GFUk7gZIhGx 8WrTa7YyakPzzLVNMguh4iIJ7lI617Vf3Of8GkLid3tQ7nioeYhl7YYC45J+Aumb vmBFSDbI66h3G/wuO8gFh15Toyk08QKsbugxJ1cVrVwx3faBJym9KCp1JJXE/oDx L9L4penKKdzNqz+8eDS/ziGa+t7HPtbgcZnmBdbmY7oZvbocQusYfqHIM2sofo8N jFltsLp95aOfWGGd8yT+ZQq8tanwabZzdIRhBaKNBVH1BhG0aJa1f3MWllWKyUUG Yvet4VDjoB1fscNns26qumYX3MclMVOgAyaofT3R8a9ALMPWV5Z/dHVQeQgtUHkY y8C2XngsHR/sRwlLlTcCAwEAAaOCAmkwggJlMA4GA1UdDwEB/wQEAwIFoDAdBgNV HSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4E FgQUC8/5FZeYHT4kJqel/1OOX2oNJx8wHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3 pkVl7/Oo7KEwbwYIKwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2Nz cC5pbnQteDMubGV0c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2Vy dC5pbnQteDMubGV0c2VuY3J5cHQub3JnLzAfBgNVHREEGDAWghRkbnNjaGVjay5s YWJzLm5pYy5jejBMBgNVHSAERTBDMAgGBmeBDAECATA3BgsrBgEEAYLfEwEBATAo MCYGCCsGAQUFBwIBFhpodHRwOi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCCAQQGCisG AQQB1nkCBAIEgfUEgfIA8AB2ALIeBcyLos2KIE6HZvkruYolIGdr2vpw57JJUy3v i5BeAAABbokf1tsAAAQDAEcwRQIgd3V9J3lW2/BqFXCJiyyF25d/grXd82rRP63r 8pFHep0CIQCiZx4P2BK/jDIU3/8R/LrpVZ3YgMmHknMwqnw5lKXtUQB2APCVpFny ANGCQBAtL5OIjq1L/h1H45nh0DSmsKiqjrJzAAABbokf2NUAAAQDAEcwRQIhALDB wNCxODkjQO+p8EFLwLG1GibtIR6ZKCIHNN4m9jLQAiBiym3vtT/AasRwcXSzmIYH yUKaOzUEn3NLHhtSHg06yTANBgkqhkiG9w0BAQsFAAOCAQEAeZ5bz+6yn31K5q2c gdKwJEA2wfWi6ZYuK2ZVCq0JyLcvAAV9GgGagmGwYsF1NxPTMbv3g+0HD0lLfwj2 obNO/pIsVVzRDoU5on0lup9+0y5hZYSdnkdxcl8xfrns9V2DvfYtXhNQjAzAbGMN 1HBDB/vxr/20NXs7azM0gS3tY0n9fN7nSwOYIsEXlvvOXpZAnrr+fgBs70DtQzJx 7RgbqlskuqeV0AeT9X6TzKnE/tSzBSQ4Ipukh4bB+tw1W0+NV6UXcPCSrzH6YzsL rc+Slv8/9VjyGS15pBR1TjCMYZLj+o3FIJNSfcV4aJoRFDS/PFHwSCDjhiyHrb0E 4yf/eg== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAxCXDQKAnBFCj2zoJdxS7 VSBXKiKHlrhbt82MxUsXxcBSwPx0ReQz6Y4OXWhBKilzP9gzFQzt3sXFoWJXVYwa /B9tb/ioGmxWV2p7at2bHpaLZkRbPn9aybeKZ60OEs1m0DD93IHKSbt1/D4aJm3x UX9Rso4bgXKStjN/cBQEgHUjbBraWiUNkI6Kj93OvSfSq+i21+GIyboviIt5GZ6S 5CYuXQxfSbofxa7+pUeyKdY4ANbFzZ/Bqz0/gfzfA/O1225SDGW3loDch8FmHxzX 13vmR1Cn7X7lviiyRAJugjo79EvSU5oZGqGL1RR4jxFCx5dKQOyzB4Go/GFUk7gZ IhGx8WrTa7YyakPzzLVNMguh4iIJ7lI617Vf3Of8GkLid3tQ7nioeYhl7YYC45J+ AumbvmBFSDbI66h3G/wuO8gFh15Toyk08QKsbugxJ1cVrVwx3faBJym9KCp1JJXE /oDxL9L4penKKdzNqz+8eDS/ziGa+t7HPtbgcZnmBdbmY7oZvbocQusYfqHIM2so fo8NjFltsLp95aOfWGGd8yT+ZQq8tanwabZzdIRhBaKNBVH1BhG0aJa1f3MWllWK yUUGYvet4VDjoB1fscNns26qumYX3MclMVOgAyaofT3R8a9ALMPWV5Z/dHVQeQgt UHkYy8C2XngsHR/sRwlLlTcCAwEAAQ== -----END PUBLIC KEY-----
ASN.1 decoded
[c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . [c:0|t:2|false] INTEGER 2 . . . . . . . . [c:0|t:2|false] INTEGER 324398792914958523711008127259743136312126 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.6 (countryName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'US' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.10 (organizationName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Let's Encrypt Authority X3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-11-20 13:03:15 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-02-18 13:03:15 +0000 UTC . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'dnscheck.labs.nic.cz' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.1 (rsaEncryption) . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (4208 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 800212027936896726014740392826802626395413057595411801825001176822921218987971817113957091692797189250021303477710410806689597954243413909932588090701045492290250711765329809131220596095431764509433658583085614781066960084725717659964830977540353318609253910003336615794507555854171831071096967967179589950757588903431262622322574286957549507578028730959500114550295950375087787203416861984819607891465725842094115338094944843230312538130626818598463595763016405429432053866702527063451315560027308410655396300776782979319064215509773623317760909098813711612598826439761050887099751854775644124027046671917112835295489908476292158089752926714655479127382622133877226094370010956954418912830396179437360415168396918301614913807230930960710292218573751361502158108323832938011242210359495626421571923753676199782377188639133675931976913878076210320146724286787044540935422804906205808538893410114789064082529238706703049504331026623549180823110291025500611950437659847237451839954794130554226605082596471755407419759986980988574560003506740749729305116678537143373487142181229792984831630305493898296995272497292753502291590000783863255568650871721885939186947617682320951492445580148152856560622832322125602517471291235470234276828471 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 65537 . . . . . . . . [c:2|t:3|true] ORAddress . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.15 (keyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (4 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (3 bits) 05a0 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.37 (extKeyUsage) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.1 (serverAuth) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2 (clientAuth) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.14 (subjectKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes) 0bcff91597981d3e2426a7a5ff538e5f6a0d271f . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName a84a6a63047dddbae6d139b7a64565eff3a8eca1 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1 (authorityInfoAccess) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (99 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.1 (ocsp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://ocsp.int-x3.letsencrypt.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://cert.int-x3.letsencrypt.org/' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17 (subjectAltName) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'dnscheck.labs.nic.cz' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32 (certificatePolicies) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (69 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.23.140.1.2.1 (Domain Validation Certificates Policy) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.44947.1.1.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f0007600b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016e891fd6db0000040300473045022077757d277956dbf06a1570898b2c85db977f82b5ddf36ad13fadebf291477a9d022100a2671e0fd812bf8c3214dfff11fcbae9559dd880c987927330aa7c3994a5ed51007600f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000016e891fd8d50000040300473045022100b0c1c0d0b138392340efa9f0414bc0b1b51a26ed211e9928220734de26f632d0022062ca6defb53fc06ac4707174b3988607c9429a3b35049f734b1e1b521e0d3ac9 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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