app.greymatterlearning.co.uk

Issued by R3

About this certificate

This digital certificate with serial number 04:f1:a8:75:2e:25:99:f8:8a:57:57:41:79:24:4a:a6:ff:ea 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:
  • 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=app.greymatterlearning.co.uk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:f1:a8:75:2e:25:99:f8:8a:57:57:41:79:24:4a:a6:ff:ea
Serial Number (int): 430681112892981406177057535081644642729962
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: a9:26:90:e7:dd:c1:c7:e6:b4:7f:f9:f2:ae:80:53:4d:32:8f:54:81
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 06:f5:87:4b:0a:0b:af:de:07:70:c1:60:9e:97:4e:cf:d7:90:6a:89
Fingerprint (sha256): 49:93:6b:54:8d:62:82:10:cd:65:fc:87:7c:fc:de:ac:df:33:a2:0c:f3:6f:eb:1d:81:97:b6:ca:59:28:a8:9e

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

Revocation information

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

Check the revocation status for certificate app.greymatterlearning.co.uk

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for app.greymatterlearning.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

9 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

app.greymatterlearning.co.uk

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Certificate

The complete raw certificate details for app.greymatterlearning.co.uk in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2m0+huas1Xenmiq8HCmr
bwQssy+CN2qi1TmnlCTo1tHDX3MG0tKehghg65gqfyCbTf6S0NkNU5KwKqIwgPPM
08hTL55UQGihGH0z2PzjVxF3K0jo/ZcCSz3zO1pP9mQrzR+RpH83t0O6BbbMB41m
l/C6H7eZ32Ee38uEPRtGDO6rDacT5FXD74ONCJ6/GVdzFx+yJQX9gmoyh6z9TJys
ojU+9xq84PiIBnVYnI1Wg9XOD6YPbt7q5P8bc/J9t5piFcOOnU04/vKHJwYL3DFk
ulGqAEFWrhj+dBVQO/l2Sw6V4HWt/eRBlJ1Qv3IBIm1O/u/XdlpP6YvxYmqRlo9m
pwIDAQAB
-----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 430681112892981406177057535081644642729962
 . . . . . . . . [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 2024-01-21 04:01:52 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-20 04:01:51 +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 'app.greymatterlearning.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 (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 27573820828042675158664415194409017419751983003369599787582958492431689429091326727253550776745346950379023299227949023707917379154181070148189877062228144081985784283323064634332894550925385355233816030182642901677884576147255058633184971400881084671113587252313199655577006057074016728591195092841331965407984621163467137862313637786719016248417073705247060932873754050583989580400370509216876498523065187517372291577979318132500644728916591707730668954676602975658953695793510059815258253246815339619756314307708414653120681736971501001471222215026990678682310759880891163510687003688416910523040717851334728967847
 . . . . . . . . . . . . . . . . . . . . [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)
							a92690e7ddc1c7e6b47ff9f2ae80534d328f5481
 . . . . . . . . . . . . . . . . [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 (32 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'app.greymatterlearning.co.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)
							00ef00750048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018d2a6586fa0000040300463044022049712ccbef4289f35a329d0975091415f37d699be56f4380d4052b0674da171802204f77bc2056adb9990a694e638cfa115090f0bf42ce0cab861fe1737e73f08ae4007600a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018d2a6586f7000004030047304502203820ea5568730734def324a401941bc14419914ed6d1daa902299b3c8d7f04d4022100e9da90d92983ddc311aa557efaa62db3d057d95ac33fc44761fb70c03d239c7c
 . . . . [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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