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:e7Serial 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.orgCheck 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----- MIIE6zCCA9OgAwIBAgISA7ktK3zqgXbbU+qukWIE65TnMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzA3MDIwMzE5MjNaFw0yMzA5MzAwMzE5MjJaMBoxGDAWBgNVBAMT D3NvY2tldC5jZi5hYy51azCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB AN9IpFfUVoqZ4qP9L+Zw7L9JMUYY434CYYwu3R5/mNYuYXpWT/sIKMzQK66y9T5W 5mDQlQkKewuDo8CmJnZjEH5Sz3adMXFe1hkWU4wPsQ7sNidTsnE5XJncvq987/qo sP1Wt33Qa9wfVs/qydoxZ/BsByp+VsONgZNBFe2uvKaAONa9PNWZEXIxvS8K3dVQ kA8bGswS3heGKLsGpjT+wPHyOCSaDfs8/1YBXQdv9s7vzH4izTfiwkZHhtTHd9KN 9FueW87R7vrgwvPDtFhDwOY9+uNjjokh9EfhUaH0dlUuYMDToNEOS9zHEmVFPr4b NHAWeVrThXXRtjFUppcv4McCAwEAAaOCAhEwggINMA4GA1UdDwEB/wQEAwIFoDAd BgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNV HQ4EFgQUxPklNhvkabhjGJqfQX+L/QKfthYwHwYDVR0jBBgwFoAUFC6zF7dYVsuu UAlA5h+vnYsUwsYwVQYIKwYBBQUHAQEESTBHMCEGCCsGAQUFBzABhhVodHRwOi8v cjMuby5sZW5jci5vcmcwIgYIKwYBBQUHMAKGFmh0dHA6Ly9yMy5pLmxlbmNyLm9y Zy8wGgYDVR0RBBMwEYIPc29ja2V0LmNmLmFjLnVrMBMGA1UdIAQMMAowCAYGZ4EM AQIBMIIBBAYKKwYBBAHWeQIEAgSB9QSB8gDwAHcAtz77JN+cTbp18jnFulj0bF38 Qs96nzXEnh0JgSXttJkAAAGJFNOsRAAABAMASDBGAiEAyYxv1wvIMaDWknANAYIK pkV2ojW1ES2Zpkga/SSQ1+4CIQCyUVDyZNcOnEyjkeAiFwmZ/pqPF6roifS5vWnH TK2ApAB1AOg+0No+9QY1MudXKLyJa8kD08vREWvs62nhd31tBr1uAAABiRTTrGkA AAQDAEYwRAIgYuoJ+ywy4WQK/cGnsRHzBmJMDvrHmmH8Bas21YH3kQcCIBzjwiNv 4e8Dku4oRby5G/QQuVlFaKcKTjtOsGzK2PMCMA0GCSqGSIb3DQEBCwUAA4IBAQCt HnAhpHzqMrAo2pQIwkRNi3gRas6R6MCu4h8oUQkERwIgg89/eMlqZK1esdp0oLBV Izn5E82N1/xZhC20Mz6obcow2iA6HHhhtgIdmr1NsMX8VBVYv1LewMRVfIekX9za UWqSGYs2j1w7+f4irjeAro8HT8DJbZCxcIPjMO2M5lbbu4aYC++t2cft3ggj0h5L SQJJkzZOTy1uvBc07XaU0hS9y8LyYa06yjTj8+VGFkBiiiyj1paSDOJw+/wqgLKE aXG2tMzQ7XYp8gqmOj4eWGyqGtnwmkriuSHPWDSuUbGFWQaaSNJWOT2RSySai0nS QwyURuzXdq+JBfbX2XZk -----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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