socket.cf.ac.uk

Issued by R3

About this certificate

This digital certificate with serial number 03:b9:2d:2b:7c:ea:81:76:db:53:ea:ae:91:62:04:eb:94:e7 was issued on by Let's Encrypt.

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=socket.cf.ac.uk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:b9:2d:2b:7c:ea:81:76:db:53:ea:ae:91:62:04:eb:94:e7
Serial Number (int): 324349136737827842028869604738057626162407
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: c4:f9:25:36:1b:e4:69:b8:63:18:9a:9f:41:7f:8b:fd:02:9f:b6:16
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 96:e4:e5:47:6c:da:d2:ce:3a:ae:75:0e:e9:1b:46:80:9d:47:da:05
Fingerprint (sha256): 04:e2:e3:60:74:1d:19:87:68:fd:af:90:83:27:3f:ed:4c:bb:c0:e7:8d:66:55:57:c5:1a:0b:24:07:af:c3:82

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

Revocation information

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

Check the revocation status for certificate socket.cf.ac.uk

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for socket.cf.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

socket.cf.ac.uk

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Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA30ikV9RWipnio/0v5nDs
v0kxRhjjfgJhjC7dHn+Y1i5helZP+wgozNArrrL1PlbmYNCVCQp7C4OjwKYmdmMQ
flLPdp0xcV7WGRZTjA+xDuw2J1OycTlcmdy+r3zv+qiw/Va3fdBr3B9Wz+rJ2jFn
8GwHKn5Ww42Bk0EV7a68poA41r081ZkRcjG9Lwrd1VCQDxsazBLeF4YouwamNP7A
8fI4JJoN+zz/VgFdB2/2zu/MfiLNN+LCRkeG1Md30o30W55bztHu+uDC88O0WEPA
5j3642OOiSH0R+FRofR2VS5gwNOg0Q5L3McSZUU+vhs0cBZ5WtOFddG2MVSmly/g
xwIDAQAB
-----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 324349136737827842028869604738057626162407
 . . . . . . . . [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 2023-07-02 03:19:23 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-09-30 03:19:22 +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 'socket.cf.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 28186963095527120863646220428049303192900079749568393639659883585239515022303548537793654207690963885242545257340272270415397183115894702331172316688088935027550369805771987309819370764258885139115176332327450194342772457809473369028988955126532223135635129044606815111657577106708411484266129509659357916420276452524882976341037392933916013198893911908066448815007258476498246367232672207837409093044439868529263132159621716728384948686338494368303685709794064752594966130178377447410674639427535726783943097540782684311656671722323895157923796126603894483902332154054095665355023611836936818597457275042545531871431
 . . . . . . . . . . . . . . . . . . . . [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)
							c4f925361be469b863189a9f417f8bfd029fb616
 . . . . . . . . . . . . . . . . [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 (19 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'socket.cf.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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007700b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb4990000018914d3ac440000040300483046022100c98c6fd70bc831a0d692700d01820aa64576a235b5112d99a6481afd2490d7ee022100b25150f264d70e9c4ca391e022170999fe9a8f17aae889f4b9bd69c74cad80a4007500e83ed0da3ef5063532e75728bc896bc903d3cbd1116beceb69e1777d6d06bd6e0000018914d3ac690000040300463044022062ea09fb2c32e1640afdc1a7b111f306624c0efac79a61fc05ab36d581f7910702201ce3c2236fe1ef0392ee2845bcb91bf410b9594568a70a4e3b4eb06ccad8f302
 . . . . [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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