optimalfireandsecurity.co.uk

Issued by R3

About this certificate

This digital certificate with serial number 03:dd:16:a7:f1:e2:06:cc:f9:61:84:a0:cd:15:7d:28:1f:53 was issued on by Let's Encrypt.

With 2 subject alternative names this certificate can be used to secure multiple fqdn's. This certificate is currently not expired, we haven't checked the revocation status of this certificate but you can do this simply on revocationcheck.com. 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=optimalfireandsecurity.co.uk

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate will expire on

Certificate Details

Serial Number (hex): 03:dd:16:a7:f1:e2:06:cc:f9:61:84:a0:cd:15:7d:28:1f:53
Serial Number (int): 336569375920259167747565922294017332617043
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: bb:b8:94:74:b1:15:68:c8:6b:d6:91:a9:65:bb:2d:82:0c:79:13:02
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): dc:a4:f1:8b:e7:8b:6a:f2:aa:c0:fc:d2:f9:9a:f1:f3:6c:00:43:86
Fingerprint (sha256): d0:d3:1a:24:30:98:ce:b0:97:18:1a:a8:8d:d5:e2:0e:75:c8:5d:16:f9:ca:ba:1a:1c:38:24:18:eb:48:c1:11

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

Revocation information

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

Check the revocation status for certificate optimalfireandsecurity.co.uk

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for optimalfireandsecurity.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

optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk

Other certificates including the domain name optimalfireandsecurity.co.uk

(limited to 100 certificates)
www.optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
optimalfireandsecurity.co.uk
optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
optimalfireandsecurity.co.uk
optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
optimalfireandsecurity.co.uk
optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk
www.optimalfireandsecurity.co.uk

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsCG2TkHCWY3R4Lu3mPOx
cZdDlhGopmNFoBfZeB0y9ajta/tEbTEhp9gnlO2149qeDXsxaar2i0d329/1imqL
dMr/ZPtd2YGLcpOQMVzsoVHm+1fyD36lnXGZ7tAAf9t7tp/Tip90m41wZq1ONiNC
lJVC5HJGHj+5SZZzDeY05+ihnmDnfcrx/fOR426XiobckUbciMiQGAB20w+58BB6
e0dOWQ/SHz76LN7wiuO2lD5G4wsKbmPughhWyg9pw4N0+fNJVe/oETfWlhiN25/O
f7TtW7UtoPulEGjj+PIcTJRrMy9/RZWBvn3MBxp6n9/4yHeUADP+zG4jKpBSg08C
XQIDAQAB
-----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 336569375920259167747565922294017332617043
 . . . . . . . . [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 2024-02-05 07:44:55 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-05-05 07:44:54 +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 'optimalfireandsecurity.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 22234565745708428608251693238776045453684841138438289289998594135543494038356496683938044196300691226916516908624110016281555191063714011368625877784201575139832789158548910354736867320317018530283274702256568423455285200259184385185340499386323557470456426693042236581388304009819871752473788314079939130842406517852609761760338668442232008617196661228388923183910488654429748822017667053226356124217477427005150206146857489673723432891516500185836303601523434930310804348462119687966451938874305933311404168228851917445477294014582031093216347624051184242252924667003564233260777228288699127998411882030781344711261
 . . . . . . . . . . . . . . . . . . . . [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)
							bbb89474b11568c86bd691a965bb2d820c791302
 . . . . . . . . . . . . . . . . [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 (66 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'optimalfireandsecurity.co.uk'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.optimalfireandsecurity.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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f000760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018d78711d53000004030047304502206a3a4cc9f8ddfcbd48f7b38125c3603e97e9ce6bd27d3469f813a1517643ab3d022100b68c02f39b29947bcdb452b942b09acf5ef6ca9f1fc49bf80c726e284189aada0076003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018d78711d590000040300473045022100da8e22a2976cf3ce1745325e91b6c9b8174325f779b6bb107136ca3a46b6a2520220582f088851a7854688b5a4e1d5e88b81af78700cd3effae4b5f85630d0e24493
 . . . . [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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