DV SSL/TLS Certificate for artedu.cz

Certificate is witin its validity period

Issued by Let's Encrypt (R10)

About the artedu.cz DV SSL/TLS Certificate

This certificate with serial number 05:8d:85:63:7e:ce:c9:9b:35:12:48:9c:5a:58:f3:16:ad:1d for artedu.cz was issued on by Let's Encrypt.

With 2 subject alternative names, this certificate can be used to secure multiple FQDNs. This DV SSL/TLS Certificate is currently within its validity period but we haven't checked the revocation status of this certificate, you can do this simply on revocationcheck.com. We have found some issues with the compliance of this certificate, they are be shown below. We hope this DV SSL/TLS Certificate review for artedu.cz provides you with the detailed information you were looking for.


We have identified some issues with this certificate:
  • 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)

Let's Encrypt

Organization: Let's Encrypt
Country: US

This X.509 certificate will expire on

Certificate Details

Serial Number (hex): 05:8d:85:63:7e:ce:c9:9b:35:12:48:9c:5a:58:f3:16:ad:1d
Serial Number (int): 483718547327448950999634502748279131254045
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: b7:07:01:c1:17:e4:c3:4f:1f:60:b6:3f:29:11:23:b8:4a:c5:44:fe
Authority Key Identifier: bb:bc:c3:47:a5:e4:bc:a9:c6:c3:a4:72:0c:10:8d:a2:35:e1:c8:e8

Fingerprint (SHA-1): 3b:ed:ca:80:e0:c7:2d:ac:1a:84:b5:54:f8:ea:d7:f9:b3:37:cd:5b
Fingerprint (SHA-256): 1b:df:5e:ee:80:29:35:08:b7:3e:d9:16:9e:31:81:f9:0b:e8:8c:0f:17:15:7b:d5:0b:fc:bb:44:fb:cb:21:6f

Issuing Certificate URL: http://r10.i.lencr.org/

Revocation Information

CRL Distribution Point: http://r10.c.lencr.org/30.crl

Check the revocation status for certificate artedu.cz
2
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for artedu.cz

Public Key Algorithm
RSA
Key Size
4096
Signature Algorithm
SHA256 with RSA
Key Usage
Key Encipherment
Digital Signature
Extended Key Usages
Server Authentication
Client Authentication
Extensions
10
CA Certificate
This is not a CA certificate

Subject Alternative Names

X.509 Certificate

The complete raw X.509 certificate details for artedu.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 483718547327448950999634502748279131254045
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R10'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-05-23 12:29:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-08-21 12:28:59 +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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'artedu.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
 . . . . . . . . . . . . . . . . [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 607862921346169200904778706485162859231595258420656354427682608406415720198971544668037757112443270236292646593053003216850981738473372596139509405748081527716092451926666942993827856281629549769032709518190913786263285987520351354063233489134383038149139437007269781220840355221549957805867783894761026263525797547059609736482007294562086443255874763742359848976564761961854468689448769442800347649249122191474505622543398434898189025627193681362978546951326326774827631822760738306162939703200288346839267685124189419771142047404265024399972335494932363515944972333089335509281084206684123213155648233774572190442438332514711351129490599191049295986852590988211857368194981940083047288472556553069289958917842349426576942518675897472254639868267804115548757478986598964358608060981717497999832859279044312017231266236308608977742671500939495569544620036130378140254832790284875408506404952259867379386252308518666760407944487214314799381240394377949164357116680857833972737055643197659641036168252316660674516202101373569658176975231752659720775380244764633532499445945547270852456025598982066400799574660014643566248584462347395340548896687453861681084920642132108115153595217179686384185395036585500803935827677138895341458277777
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							b70701c117e4c34f1f60b63f291123b84ac544fe
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName bbbcc347a5e4bca9c6c3a4720c108da235e1c8e8
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r10.i.lencr.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (28 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'artedu.cz'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.artedu.cz'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.31
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r10.c.lencr.org/30.crl'
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f100770012f14e34bd53724c840619c38f3f7a13f8e7b56287889c6d300584ebe586263a00000196fd53d0e80000040300483046022100e3c85fdaf32bd4cac26e290ec2027d189cd0b6bde7a1978a596cc77884cb91c0022100962f1e44fa8807a944edd4359c0a19623446abcced97fa5d94452017e41b21f5007600a442c506496061548f0fd4ea9cfb7a2d26454d87a97f2fdf4559f6274f3a845400000196fd53e08d000004030047304502205c0b8107851d1f7f0b1d49cb3b4e98de8a259932162f884dd2ba50758f879c170221008dbd242103c9b467a74011867b6df8dee8683e26a9b477cd143be66399470180
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . [c:0|t:5|false] NULL []
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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