whois.nic.cz
Issued by R3
About this certificate
This digital certificate with serial number 03:6b:a7:ed:3c:b5:40:a7:53:99:bf:db:45:11:52:f5:d2:ca was issued on by Let's Encrypt.
With 2 subject alternative names this certificate can be used to secure multiple fqdn's. 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:
- DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
- Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
- Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)
Certificate Subject
CN=whois.nic.cz
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:6b:a7:ed:3c:b5:40:a7:53:99:bf:db:45:11:52:f5:d2:caSerial Number (int): 297970283936777592195590785919111088427722
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: bf:af:13:63:cf:ec:b9:29:da:7e:b6:1e:54:ce:43:78:a6:e3:08:04
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): c2:4d:31:18:b2:5d:a0:46:43:3b:72:af:a8:02:4d:9a:6f:d7:50:4c
Fingerprint (sha256): 04:fb:01:43:e2:a6:13:c9:f9:87:cb:d7:6b:7b:9e:49:72:d6:01:64:5c:92:81:c1:49:bc:51:7c:a5:d7:21:76
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate whois.nic.cz
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for whois.nic.cz
Public Key Algorithm
ECDSA
Key Size
384
Signature Algorithm
SHA256 with RSA
Key Usage
Digital Signature
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
whois.enum.nic.cz
whois.nic.cz
whois.nic.cz
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Certificate
The complete raw certificate details for whois.nic.cz in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIESjCCAzKgAwIBAgISA2un7Ty1QKdTmb/bRRFS9dLKMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yNDAxMjkwODA3NTRaFw0yNDA0MjgwODA3NTNaMBcxFTATBgNVBAMT DHdob2lzLm5pYy5jejB2MBAGByqGSM49AgEGBSuBBAAiA2IABE7f4vbJL18zK0Xm 8awewC7BVq70i8N7YqxHvRB8gsm0bFOWWPqRUTgfcuOWfIMMU2ja2xvZtpEovQuX f40qaArYWrA/18AyIJ9TvKpmN45Re2R1wbVrS8zDbVbubc4zmKOCAiEwggIdMA4G A1UdDwEB/wQEAwIHgDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYD VR0TAQH/BAIwADAdBgNVHQ4EFgQUv68TY8/suSnafrYeVM5DeKbjCAQwHwYDVR0j BBgwFoAUFC6zF7dYVsuuUAlA5h+vnYsUwsYwVQYIKwYBBQUHAQEESTBHMCEGCCsG AQUFBzABhhVodHRwOi8vcjMuby5sZW5jci5vcmcwIgYIKwYBBQUHMAKGFmh0dHA6 Ly9yMy5pLmxlbmNyLm9yZy8wKgYDVR0RBCMwIYIRd2hvaXMuZW51bS5uaWMuY3qC DHdob2lzLm5pYy5jejATBgNVHSAEDDAKMAgGBmeBDAECATCCAQQGCisGAQQB1nkC BAIEgfUEgfIA8AB3AEiw42vapkc0D+VqAvqdMOscUgHLVt0sgdm7v6s52IRzAAAB jVR5omcAAAQDAEgwRgIhANwJs7NN/fAFl5YU/ln20ddonkX9d+fKCWQJMAnBUrFz AiEAkbivXnw13Gob6i5PfE92FucQczhV+7VWajolfDc+EEAAdQCi4r/WHt4vLweg 1k5tN6fcZUOwxrUuotq3iviabfUX2AAAAY1UeaJ0AAAEAwBGMEQCIH4IdWz8fwBL PhrL+t7XK3acb8pOCMLkWC63LCWRpaZhAiBDf7k5XwY+/gGApM/ozfortgOTte8j 6lNwtScmd23xaTANBgkqhkiG9w0BAQsFAAOCAQEAp5hwUPNPYjm09cqBaacbAEte UEmcigubX8qcDp9FH6VzDlzQVWBRoHVjG2SM0bEFo4xBuQ2PqKBJJn3jROFYPo2I tA7bT339k1CrG5NxVnmv4CAESLQTMetATyVQNniW46ER4Kh9K8lvDcuXYRHU/iMi 5fsv3dzui0EDjBVyPYdq/sFrz6thPECRMryYOG34uJz1RVNvw+0VYGwbWjrQSQ01 jGreov0g8L0vn+9+D1iFd8ySqL5YpAv4adPtZVOoc7gnIEnRNqwRRe6UTvrncaFE +Qk85ZvQElsX4H0js3gN9PzB/EQUP6l4FIjals3fD2st3OpTkz479xeac3Q2OA== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MHYwEAYHKoZIzj0CAQYFK4EEACIDYgAETt/i9skvXzMrRebxrB7ALsFWrvSLw3ti rEe9EHyCybRsU5ZY+pFROB9y45Z8gwxTaNrbG9m2kSi9C5d/jSpoCthasD/XwDIg n1O8qmY3jlF7ZHXBtWtLzMNtVu5tzjOY -----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 297970283936777592195590785919111088427722 . . . . . . . . [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 'R3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-29 08:07:54 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-28 08:07:53 +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 'whois.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 1.2.840.10045.2.1 (ecPublicKey) . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.132.0.34 (secp384r1) . . . . . . . . . . . . [c:0|t:3|false] BIT STRING (776 bits) 00044edfe2f6c92f5f332b45e6f1ac1ec02ec156aef48bc37b62ac47bd107c82c9b46c539658fa9151381f72e3967c830c5368dadb1bd9b69128bd0b977f8d2a680ad85ab03fd7c032209f53bcaa66378e517b6475c1b56b4bccc36d56ee6dce3398 . . . . . . . . [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 (1 bits) 0780 . . . . . . . . . . . . . . . . [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) bfaf1363cfecb929da7eb61e54ce4378a6e30804 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (35 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'whois.enum.nic.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'whois.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 (12 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 1.3.6.1.4.1.11129.2.4.2 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f000770048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018d5479a2670000040300483046022100dc09b3b34dfdf005979614fe59f6d1d7689e45fd77e7ca0964093009c152b17302210091b8af5e7c35dc6a1bea2e4f7c4f7616e710733855fbb5566a3a257c373e1040007500a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018d5479a274000004030046304402207e08756cfc7f004b3e1acbfaded72b769c6fca4e08c2e4582eb72c2591a5a6610220437fb9395f063efe0180a4cfe8cdfa2bb60393b5ef23ea5370b52726776df169 . . . . [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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