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:3e
Serial 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.org

Check 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-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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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