greenhead.ac.uk

Issued by R3

About this certificate

This digital certificate with serial number 04:f7:9c:be:a6:a1:ca:c1:ca:9c:03:0f:a0:d5:bf:06:60:c6 was issued on by Let's Encrypt.

With 2 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:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • 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)

Certificate Subject

CN=greenhead.ac.uk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:f7:9c:be:a6:a1:ca:c1:ca:9c:03:0f:a0:d5:bf:06:60:c6
Serial Number (int): 432707237839956834177808428983514776887494
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: c0:8c:7e:33:b2:2b:9e:a8:70:5b:f2:59:14:0f:45:36:2d:c2:65:3c
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 86:56:3b:f3:fe:cd:f6:a9:1e:98:d6:a8:0f:e4:bb:4c:a0:fd:c8:42
Fingerprint (sha256): 54:c8:28:46:9d:0c:79:aa:97:aa:eb:32:f2:1c:60:30:89:62:35:73:00:96:2f:4a:08:2a:c4:b6:8a:60:59:bf

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate greenhead.ac.uk

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for greenhead.ac.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

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

greenhead.ac.uk
www.greenhead.ac.uk

Other certificates including the domain name greenhead.ac.uk

(limited to 100 certificates)
fortinet.greenhead.ac.uk
cedar.greenhead.ac.uk
gatekeeper.greenhead.ac.uk
Moondoor.academic.greenhead.ac.uk
www.greenhead.ac.uk
exams.greenhead.ac.uk
*.greenhead.ac.uk
svn.dev.greenhead.ac.uk
*.dev.greenhead.ac.uk
*.mx.greenhead.ac.uk
moodle.greenhead.ac.uk
exams.greenhead.ac.uk
viper.greenhead.ac.uk
gmis.greenhead.ac.uk
xibo.greenhead.ac.uk
www.greenhead.ac.uk
library.greenhead.ac.uk
viper.greenhead.ac.uk
greenhead.ac.uk
moodle.greenhead.ac.uk
Parallels.greenhead.ac.uk
cas.greenhead.ac.uk
cas.greenhead.ac.uk
webmail.greenhead.ac.uk
assets.greenhead.ac.uk
exams.greenhead.ac.uk
greenhead.ac.uk
mail.greenhead.ac.uk
netman.greenhead.ac.uk
www.greenhead.ac.uk
www.greenhead.ac.uk
viper.greenhead.ac.uk
jira.dev.greenhead.ac.uk
mail.greenhead.ac.uk
www.greenhead.ac.uk
cedar.greenhead.ac.uk
netman.greenhead.ac.uk
www.greenhead.ac.uk
*.dev.greenhead.ac.uk
exams.greenhead.ac.uk
webmail.greenhead.ac.uk
cedar.greenhead.ac.uk
www.greenhead.ac.uk
gmis.greenhead.ac.uk
www.greenhead.ac.uk
netman.greenhead.ac.uk
assets.greenhead.ac.uk
gatekeeper.greenhead.ac.uk
jira.dev.greenhead.ac.uk
netman.greenhead.ac.uk
mail.greenhead.ac.uk
mail.greenhead.ac.uk
pholden.dev.greenhead.ac.uk
cedar.greenhead.ac.uk
www.greenhead.ac.uk
gcintranet.greenhead.ac.uk
greenhead.ac.uk
exams.greenhead.ac.uk
gatekeeper.greenhead.ac.uk
moodle.greenhead.ac.uk
autodiscover.greenhead.ac.uk
moodle.greenhead.ac.uk
svn.dev.greenhead.ac.uk

Certificate

The complete raw certificate details for greenhead.ac.uk in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtQrjqS4OTLrJejEcqyad
DssZFOBrWz9AfmSH4lbhKQqHuoYSEQxlBTLJ0DEWggdR5X2PZvRw5TlwTTd+6srm
gyVi7hHmhqlAevBhOmLYnXrRbMQnq2n9JbV0rRBiJ02R/kIpXUu6lp+MEsSXNqAj
U5NPifs2JlL50JiIW+0+UT+CQLB2NgWvaOrHPoBbYAn3KxAWwPElgduhxWoUoEl8
owP/QGZflc4e9FGjJhfjtfzu/IuHGqRM0apEESe8ZLDhNDpqQ8G+iCulczYHMQdL
5paX+25VASWGzykrIW8wRhCnPO5z3fkNqIpD9Gu9v682V0DnUBr7JuBMCBtZ4sT7
qwIDAQAB
-----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 432707237839956834177808428983514776887494
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-10-29 23:59:05 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-27 23:59:04 +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 'greenhead.ac.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 22854502912932251858534740865535242218852031758930717392792291316768477776279504223159554808933257279570644310172223945826178618533796083594902386716230721261765364176710732831168328924149514783758215230379470668486032413632391230576515467761799866308923526184351627025961467001118875393440471225310706959195699071082185125147548606936371468679372511613347455225882323510295385486852923403022273809688255402159283131656855860957055791322873676862531137500477843432096774468918372557737042922967287521617492832809764726984024813712620392393097908793289282548709218517170993158973577751240088023157790086833718555900843
 . . . . . . . . . . . . . . . . . . . . [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)
							c08c7e33b22b9ea8705bf259140f45362dc2653c
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (40 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'greenhead.ac.uk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.greenhead.ac.uk'
 . . . . . . . . . . . . . . . . [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 (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 (Domain Validation Certificates Policy)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef0075003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018b7e176b30000004030046304402205b52a82582fb93f9820788c16b6ec56a8ccf7dc0477dac59c5bb7aec06e44db502203b084724dec417ff52a2a9bb980c84d24e9a06cf8f373695ca56fb8479c11d23007600eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018b7e176b380000040300473045022052f1e3ca213f353a9cb305bf3b0b75e51a369ad87b5fe07438dc150edf0adb07022100acffe14f7e9ee6ae27f0a3ee3132416694703743f66b68bdadfbb7ad48e74fd5
 . . . . [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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