DV SSL/TLS Certificate for martincz.cz

Certificate is witin its validity period

Issued by Let's Encrypt (R11)

About the martincz.cz DV SSL/TLS Certificate

This certificate with serial number 05:6b:ac:02:af:b1:8d:ad:66:d1:1d:80:ad:46:34:c1:9e:5e for martincz.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 martincz.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): 05:6b:ac:02:af:b1:8d:ad:66:d1:1d:80:ad:46:34:c1:9e:5e
Serial Number (int): 472200284082699283843652883967237330935390
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: e1:47:8b:ab:a1:95:f7:25:21:90:7e:d2:3f:69:bc:04:96:db:b5:73
Authority Key Identifier: c5:cf:46:a4:ea:f4:c3:c0:7a:6c:95:c4:2d:b0:5e:92:2f:26:e3:b9

Fingerprint (SHA-1): 04:63:09:e1:37:ed:6c:cc:56:84:5e:7b:f9:f7:a5:d3:8e:a9:da:47
Fingerprint (SHA-256): cb:19:64:61:5c:5d:36:92:e4:29:09:5c:4f:0c:93:f5:d9:02:9c:ec:cc:6c:bf:82:25:34:46:9e:da:76:26:46

Issuing Certificate URL: http://r11.i.lencr.org/

Revocation Information

CRL Distribution Point: http://r11.c.lencr.org/95.crl

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

Advanced Certificate Properties

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

Public Key Algorithm
RSA
Key Size
2048
Signature Algorithm
SHA256 with RSA
Key Usage
Digital Signature
Key Encipherment
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 martincz.cz in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApuNqEqAxTwhYcebahnTG
CYuGyEuhDNJIQrMlVJ+FZOz1ZDzugd5sVMHecQq67Io64rVA1OJFEu9Gyww+GrTt
55sKX4vb9qHSuuLK2VsLxdR/UF2hsXwEtPDxNn6DHDWAzdDa18QsVCPB5LDjNJQy
SfLHxwxI7tDtp31f8wYbHmM424H+ngSsUrJYG/MhGL2QHdi1rRioPP3nCrreviby
wZjxxOwe01wqrZou6myxyjZqMAJz6J6zw5s5jw5P7rjtpvd0PvWzUil2Li4iWbgk
jHvzN1wqDINB/ECBnyq1VhJLEjn0vEY8q4vKxLoRaRKCp4Y/N9tG6pxB2svwQHY3
YQIDAQAB
-----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 472200284082699283843652883967237330935390
 . . . . . . . . [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 'R11'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-05-08 12:52:34 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-08-06 12:52:33 +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 'martincz.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 21067700818323477017159007277011806085501674185866317673050867698992266808076908468010962541959440059440233879405847273683739954051096008055001719579561182544546071526801177747993285187259202890751971297784244493984150706785994820189211785957377804425760377314140357970620020099541851182527268089820529094715195146213474455157969258005240488767225579813089919653134242680934268003266654360263243463687920604416960932376623460999012012348819204263420738565674587594932486589476818933466998971977336839548085640753610514781328514666093272937604617036773773784369774188885977995113095425191996285889915162300407088559969
 . . . . . . . . . . . . . . . . . . . . [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)
							e1478baba195f72521907ed23f69bc0496dbb573
 . . . . . . . . . . . . . . . . [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 c5cf46a4eaf4c3c07a6c95c42db05e922f26e3b9
 . . . . . . . . . . . . . . . . [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://r11.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 (32 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'martincz.cz'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.martincz.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://r11.c.lencr.org/95.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)
							00f1007700ccfb0f6a85710965fe959b53cee9b27c22e9855c0d978db6a97e54c0fe4c0db000000196b029fde60000040300483046022100eab2279d7f48eb237d7b9f2a4b7c035a062bf945b4a03d720a19160d014ee0a8022100fa3aed6e820a302463aab1f1164f0f04d7751df50efb2eeb01c46300157f1d36007600af181a28d68ca3e0a98a4c9c67ab09f8bbbc22baaebcb138a3a19dd3f9b6030d00000196b02a01790000040300473045022100e460d46210c6afdd51f1f5cf628f1eac6903642978556eb6f379ac2921b1e21f022048d3a1568e0e6e82cc3cd6f23af19ee7be19f9f076ef3212f08e41cd1016e144
 . . . . [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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