DV SSL/TLS Certificate for www.martkos-it.co.uk

Certificate is witin its validity period

Issued by Let's Encrypt (R11)

About the www.martkos-it.co.uk DV SSL/TLS Certificate

This certificate with serial number 05:a9:25:95:a6:b0:15:50:59:d1:11:a7:33:99:c1:6f:70:81 for www.martkos-it.co.uk was issued on by Let's Encrypt.

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 www.martkos-it.co.uk 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:a9:25:95:a6:b0:15:50:59:d1:11:a7:33:99:c1:6f:70:81
Serial Number (int): 493119108137346544267150787811259154657409
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: 3e:7f:8d:3e:66:b8:55:0a:c9:fd:19:1c:8a:5f:99:4e:f6:61:38:02
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): 7c:7a:36:21:31:6b:4d:15:60:0a:5f:02:d4:c1:37:09:ad:6f:35:d2
Fingerprint (SHA-256): 40:81:5b:a7:b4:85:69:7a:3f:a8:83:6f:3c:37:77:cb:2b:c2:8d:f9:ef:f1:15:c6:24:ef:96:75:35:ec:8b:a7

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

Revocation Information

CRL Distribution Point: http://r11.c.lencr.org/2.crl

Check the revocation status for certificate www.martkos-it.co.uk
1
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for www.martkos-it.co.uk

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

www.martkos-it.co.uk

X.509 Certificate

The complete raw X.509 certificate details for www.martkos-it.co.uk in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIFAjCCA+qgAwIBAgISBakllaawFVBZ0RGnM5nBb3CBMA0GCSqGSIb3DQEBCwUA
MDMxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQwwCgYDVQQD
EwNSMTEwHhcNMjUwNTI5MjExMzQ0WhcNMjUwODI3MjExMzQzWjAfMR0wGwYDVQQD
ExR3d3cubWFydGtvcy1pdC5jby51azCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC
AQoCggEBAIpXZOyrYpjjgmDw1Bg/YdCjfOwoq1rcXVki0GmKOXOsS2rVjHe6O3MG
7PqTzF5msTF9cexAuY14+6eQTrVwCSGBDwObE9rgV8oLyfOsFbwYiYszhJmr1XLT
lkkVjYbHxp5GjUbpL3zu3x7RvQJPeC7Xy/OnhcdelGcl5oxTUXa1s1K38AYKTUzW
ucRHOV/AkdSGraLUVl29qlYtVnmtwo+UfcrvGrEvc85lLtRROCtwexrIa4katdL5
s8jSaNFYyFXwhDFUBMcp7W4mMsZR9MROCHf+YxbY1mwt+YsI3rm3GGBzUIKoqRSQ
nbfsvMSA2ami7DezdpuGDosx0CXj6K0CAwEAAaOCAiIwggIeMA4GA1UdDwEB/wQE
AwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIw
ADAdBgNVHQ4EFgQUPn+NPma4VQrJ/Rkcil+ZTvZhOAIwHwYDVR0jBBgwFoAUxc9G
pOr0w8B6bJXELbBeki8m47kwMwYIKwYBBQUHAQEEJzAlMCMGCCsGAQUFBzAChhdo
dHRwOi8vcjExLmkubGVuY3Iub3JnLzAfBgNVHREEGDAWghR3d3cubWFydGtvcy1p
dC5jby51azATBgNVHSAEDDAKMAgGBmeBDAECATAtBgNVHR8EJjAkMCKgIKAehhxo
dHRwOi8vcjExLmMubGVuY3Iub3JnLzIuY3JsMIIBAwYKKwYBBAHWeQIEAgSB9ASB
8QDvAHYAzPsPaoVxCWX+lZtTzumyfCLphVwNl422qX5UwP5MDbAAAAGXHhpfbgAA
BAMARzBFAiEAn6GCmE0jzAtQ/RZp/jRm9rTyFz84D+42nIiKy7Vg51MCIBj2Afc4
6UHFoy4UXAkwBWdUuNurQQlku+bP3G8vAF5nAHUADeHyMCvTDcFAYhIJ6lUu/Ed0
fLHX6TDvDkIetH5OqjQAAAGXHhpu5wAABAMARjBEAiBz+lFhhzWcpGgIWPvnbrm9
L+x4BkuaRUuVt8EUeCOTFwIgRHZaWPMztsBd9YEaA8fvtJAh87JDwpNDDyJaG4+e
8hYwDQYJKoZIhvcNAQELBQADggEBADtAXKS/EZ37jE52rylLOZCEoI4ylCDZbFwD
r/aXFVacng4Wz9zT5b8PlwojQlzcIbyU5I3Le0HMgYuyoO66nCbNiR/ixztVtA/e
1v5QvBT6pW+9xgXIWsHz+tRab0Xh+RdHYG2luQRhpnOzZZmOn1Dkmz+uUVYXgn/c
p7qAGgUmqNH1JMR2ri2LovJ0589ueCWjGbeb53YXiMxArC9g6RVSx0pTMKSvtDTE
K1IZoAfYdmilbLx5YZgSsHEURT5YPJETacUERS2SUtkDi8kC7VCeNHiVrKISkSvN
HEbKdYz+LcuHPvdGjAt31E1TwG45cOM/0HvVpimCrNi93cXJ2aM=
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAildk7KtimOOCYPDUGD9h
0KN87CirWtxdWSLQaYo5c6xLatWMd7o7cwbs+pPMXmaxMX1x7EC5jXj7p5BOtXAJ
IYEPA5sT2uBXygvJ86wVvBiJizOEmavVctOWSRWNhsfGnkaNRukvfO7fHtG9Ak94
LtfL86eFx16UZyXmjFNRdrWzUrfwBgpNTNa5xEc5X8CR1IatotRWXb2qVi1Wea3C
j5R9yu8asS9zzmUu1FE4K3B7GshriRq10vmzyNJo0VjIVfCEMVQExyntbiYyxlH0
xE4Id/5jFtjWbC35iwjeubcYYHNQgqipFJCdt+y8xIDZqaLsN7N2m4YOizHQJePo
rQIDAQAB
-----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 493119108137346544267150787811259154657409
 . . . . . . . . [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 2025-05-29 21:13:44 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-08-27 21:13:43 +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 'www.martkos-it.co.uk'
 . . . . . . . . [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 17463981789429365096356453820503341848809353348580678258497294478064736040694182153893779473768265708718857142632570335494526877558214760827041809557791994756359570560005253644971409763387967302903742946039774535972324873249112500768729860196431159342538747905189370928971216019516528231055722021875563078483613476362678315238874765229453003028742712417232938650626046241093981040105332642406620815923957501856512896835105976933093987417148927850332667848532815569536188916610708440353125235768125052357751280840747338688576600909113297332903547598273157098699772950001230834775308110613095443237920868052578324441261
 . . . . . . . . . . . . . . . . . . . . [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)
							3e7f8d3e66b8550ac9fd191c8a5f994ef6613802
 . . . . . . . . . . . . . . . . [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 (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.martkos-it.co.uk'
 . . . . . . . . . . . . . . . . [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 (38 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/2.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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007600ccfb0f6a85710965fe959b53cee9b27c22e9855c0d978db6a97e54c0fe4c0db0000001971e1a5f6e00000403004730450221009fa182984d23cc0b50fd1669fe3466f6b4f2173f380fee369c888acbb560e753022018f601f738e941c5a32e145c0930056754b8dbab410964bbe6cfdc6f2f005e670075000de1f2302bd30dc140621209ea552efc47747cb1d7e930ef0e421eb47e4eaa34000001971e1a6ee70000040300463044022073fa516187359ca4680858fbe76eb9bd2fec78064b9a454b95b7c11478239317022044765a58f333b6c05df5811a03c7efb49021f3b243c293430f225a1b8f9ef216
 . . . . [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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