lincolnchurch.org

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:fb:c0:f9:85:13:90:e9:ba:a6:27:52:49:fb:bc:c3:d8:34 was issued on by Let's Encrypt.

With 7 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=lincolnchurch.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:fb:c0:f9:85:13:90:e9:ba:a6:27:52:49:fb:bc:c3:d8:34
Serial Number (int): 347004239248655434064854351458338357893172
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 89:10:de:a0:6a:a8:a1:e8:49:5b:e7:93:95:5c:6b:fd:77:a4:1b:73
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): d2:fe:24:96:bd:cd:56:71:7a:8f:94:fa:6f:9e:03:71:7d:10:41:74
Fingerprint (sha256): 59:74:0e:5b:3b:7c:f5:f7:29:e2:61:35:0d:67:a4:1d:89:0c:24:78:39:64:36:5f:29:6a:63:72:52:cf:a8:3d

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate lincolnchurch.org

7

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for lincolnchurch.org

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

lincolnchurch.org
www.brianjacobs.org
www.campjoyinc.com
www.fridaynightsing.org
www.golfingsouth.com
www.lincolnchurch.org
www.rockhouseministry.com

Other certificates including the domain name lincolnchurch.org

(limited to 100 certificates)
lincolnchurch.org
lincolnchurch.org
www.lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
www.lincolnchurch.org
lincolnchurch.org
lincolnchurch.org
www.lincolnchurch.org
lincolnchurch.org

Certificate

The complete raw certificate details for lincolnchurch.org in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA7GNPZR16GG15tMvD8Z/9
/IXDp0b/gGjJKpmZ1fA5ecap48yEVNBzt0Yk3MOIrlWQ3zdL8Y0FaWwEcaIMV1ZJ
qftF45Y+LMUG54kjEy7EpvBJp3PqRMpqRjyo08/aWTMUFfCSSjF6zdByfNwD7kxz
nLnB+x1fpeh43h5fTWovUQi4O1ndG2+HDIbMzBqJf2k4Fk+ZeRoU+fP9Cg35UTz1
9rsL/tqGjbDq38d/A0P8HdLhi0d/QCPoQBpFXHMOfphiYZr6Xu8zB1IDz6DrUc3P
Fl772i0KbzuRg9fRH9KaJVu2VKcio8ol1krUtv7yyHngNBee/kKv8RG/cCOiI6fz
fwIDAQAB
-----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 347004239248655434064854351458338357893172
 . . . . . . . . [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 'Let's Encrypt Authority X3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-23 04:52:43 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-06-21 04:52:43 +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 'lincolnchurch.org'
 . . . . . . . . [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 29841211625567839681976208818942342626526355475137362925053693009857981983362856374982612329621285001939644527407112529918915621808627596041795622068024159590135150545136218015054992196919547406970916109754498823360982335251636790858465292417601745173585507703051829481710080574158940721610989060293454720584615517016167249470451505238814304592452453237963426203643041766219653460442960254672185714628391438730942657369973353119115292543221317837212092415242900455385281584437438915343663602033417745495742355524884167484302394523154720969179591253998241192927407781833858766902021560820011637543119205105096085468031
 . . . . . . . . . . . . . . . . . . . . [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)
							8910dea06aa8a1e8495be793955c6bfd77a41b73
 . . . . . . . . . . . . . . . . [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 a84a6a63047dddbae6d139b7a64565eff3a8eca1
 . . . . . . . . . . . . . . . . [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 (99 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://ocsp.int-x3.letsencrypt.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://cert.int-x3.letsencrypt.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 (160 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'lincolnchurch.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.brianjacobs.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.campjoyinc.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.fridaynightsing.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.golfingsouth.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.lincolnchurch.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.rockhouseministry.com'
 . . . . . . . . . . . . . . . . [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 (69 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 1.3.6.1.4.1.44947.1.1.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org'
 . . . . . . . . . . . . . . . . [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)
							00ef0075005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000017105f350120000040300463044022031345fa396010d4d6bbefede22170b3f57802677eba4fdb4b2c48eae2a8066c502202d99fae266cb040165c91945c8faee3d30cd9a637578166b5518909ff51e76d500760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000017105f3503500000403004730450221009d4697eab81b21da0c3406c12d44b29c3633b613a805d2436869e369b0ea13af022039106d056509e99d85e5ca651398c2c0297f47e6a70a977efb367f6f57a86763
 . . . . [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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