christian.org.uk

Issued by GlobalSign Domain Validation CA - SHA256 - G2

About this certificate

This digital certificate with serial number 4d:92:9e:22:c2:e4:d7:33:e9:b6:c9:3a was issued on by GlobalSign nv-sa.

With 4 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=christian.org.uk,OU=Domain Control Validated,C=GB

GlobalSign nv-sa

Organization: GlobalSign nv-sa
Country: BE

This certificate has expire since

Certificate Details

Serial Number (hex): 4d:92:9e:22:c2:e4:d7:33:e9:b6:c9:3a
Serial Number (int): 24007595701044484217396185402
Serial Number lenght: 95 bits, 12 octets

SubjectKeyId: 12:7c:06:08:b2:ba:fd:05:d7:58:cb:b9:77:68:0e:15:bb:e0:eb:61
AuthorityKeyId: ea:4e:7c:d4:80:2d:e5:15:81:86:26:8c:82:6d:c0:98:a4:cf:97:0f

Fingerprint (sha1): fb:0a:0c:66:a0:90:8e:f4:9a:f0:6f:99:cb:4e:16:d8:fa:d6:34:9d
Fingerprint (sha256): db:88:1a:a7:3b:ff:81:4b:38:5d:9a:d7:ba:7e:8f:86:50:62:13:dd:4d:44:76:9c:fe:8c:a0:7a:1b:c9:1e:0c

Issuing Certificate URL: http://secure.globalsign.com/cacert/gsdomainvalsha2g2r1.crt

Revocation information

OCSP Server: http://ocsp2.globalsign.com/gsdomainvalsha2g2
CRL Distribution Point: http://crl.globalsign.com/gs/gsdomainvalsha2g2.crl

Check the revocation status for certificate christian.org.uk

4

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for christian.org.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 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

christian.org.uk
owa.christian.org.uk
mail.christian.org.uk
autodiscover.christian.org.uk

Other certificates including the domain name christian.org.uk

(limited to 100 certificates)

Certificate

The complete raw certificate details for christian.org.uk in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjokaJdkprwVTvIWBUZOK
13Vj+t4qyHyeU3Qn31JwViu4DfLiATQj8fDFknRmobMv/EiPt2Pke7GTkBFp5HkM
IX8NhIpKMf6DxCtehL8VxkfQ+TYXYRpvCt62YL3qD7YAzfEkoG1jgK1KbCSNQ9LF
hG4Eeon7/Dv+r5drIsiGU4nuZIQbbNHs1ijSQ1MUzswBo2xOece1rU6skrqNH4v9
IgqFYSG4hjM4JSI/LGMiggdR/GALCq3YjzZEg4q+mj7Iz2l8L8UpMBz/JqoYp6C6
D3qtTW4z50OocJZDmzWLU0zrltEBnpch023AqsuzViFxJ2c+yv3fsv7JXil71J5d
2QIDAQAB
-----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 24007595701044484217396185402
 . . . . . . . . [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 'BE'
 . . . . . . . . . . . . [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 'GlobalSign nv-sa'
 . . . . . . . . . . . . [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 'GlobalSign Domain Validation CA - SHA256 - G2'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2017-11-07 15:21:45 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-12-07 15:21:45 +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 2.5.4.6 (countryName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'GB'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Domain Control Validated'
 . . . . . . . . . . . . [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:12|false] UTF8String 'christian.org.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 (rsaEncryption)
 . . . . . . . . . . . . . . . . [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 17993446890192947349585443490778140065711185766514672381145212690450994494875846266520570345168591335473346889074243661254812890068037123148300192356223857688626303099171004663100107960763116331767457724249372129849900305536356747556801317936939661669336951300475240958597459039438276536911866384405382293075842168349241924143860242103628195737537665757502191743353514302624487452366224825834076991162814233878472038883830468389662307994878063947075700990069531219167844330304903726217780332042951431440971046550605232218225766660963597326011002390758915502566119945915316135055667685482363364962978206787743300607449
 . . . . . . . . . . . . . . . . . . . . [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 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (135 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 (caIssuers)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://secure.globalsign.com/cacert/gsdomainvalsha2g2r1.crt'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://ocsp2.globalsign.com/gsdomainvalsha2g2'
 . . . . . . . . . . . . . . . . [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 (79 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.4146.1.10 (globalsignDVPolicy)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 'https://www.globalsign.com/repository/'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 2.5.29.19 (basicConstraints)
 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.31 (cRLDistributionPoints)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (60 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://crl.globalsign.com/gs/gsdomainvalsha2g2.crl'
 . . . . . . . . . . . . . . . . [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 (96 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'christian.org.uk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'owa.christian.org.uk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.christian.org.uk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.christian.org.uk'
 . . . . . . . . . . . . . . . . [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 2.5.29.14 (subjectKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							127c0608b2bafd05d758cbb977680e15bbe0eb61
 . . . . . . . . . . . . . . . . [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 ea4e7cd4802de5158186268c826dc098a4cf970f
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.3 (CT Precertificate Poison)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:1|false] BOOLEAN true
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (2 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:5|false] NULL 
 . . . . [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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