gpex.org

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:f7:a7:4c:e4:e9:80:b0:fa:57:a4:5d:1d:fc:eb:5c:ac:b5 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=gpex.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:f7:a7:4c:e4:e9:80:b0:fa:57:a4:5d:1d:fc:eb:5c:ac:b5
Serial Number (int): 432721268689259496192437992912756995304629
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 30:e2:83:d7:2f:91:9a:8d:e4:03:ef:e4:4d:79:41:32:3b:b3:94:b8
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): e2:ab:b0:74:5a:48:db:5b:8a:0a:40:8e:ff:f5:fc:5e:1c:4b:91:09
Fingerprint (sha256): 15:60:ae:d4:b4:bc:d5:b0:bb:0d:4e:02:7a:82:9f:5a:d7:89:7a:ef:22:fe:13:29:aa:8d:5d:46:e6:8d:d6:21

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 gpex.org

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for gpex.org

Public Key Algorithm

RSA

Key Size

4096

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

gpex.org

Other certificates including the domain name gpex.org

(limited to 100 certificates)
www.gpex.org
gpex.org
gpex.org
gpex.org
www.gpex.org
www.gpex.org
nigeriarealestate.mobi
gpex.org
gpex.org
gpex.org
gpex.org
gpex.org
gpex.org
121.software
gpex.org

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 432721268689259496192437992912756995304629
 . . . . . . . . [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 2018-12-07 02:12:34 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-03-07 02:12:34 +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 'gpex.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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 895269702455459421993351481249416563794603201502949223862005164180534043425321397912509862275484440260124196538550524873342959187084710289344005777448750765717210018124961272351303806461758562969976197203979352459415733368528232931655840148959699524941687026317851975139991088389921098385564519264652858621007162323970094917503965041292884420195935608918799703783178496503730604631930073826386061348855817002224437261334125180548512303667226817877453315927208497448540869560906195578334741852717783745185482980551740306935533466222225349008558619319995672211410029022361829274662783588193365054108696702847828939241917324889094165070802276559844301177415153061519876456245533069998131195877409289224350059820765327207270642499099886001960718385162041372004888857460913246818128700618449141777970522232984172919665691980231915394877951795640163719024714361455725061697891579620726444725127688780547109843688666684420520123819263224756980877317454512828229368946435513567478597023301765380265425138195049770083506147171819987355569381978973746200138845515240371065734325077121630175675659134866820024326688920763529221262167918453760186040421810124046128715291125115548428686589521900841279461631212617663685925710095142935104459926169
 . . . . . . . . . . . . . . . . . . . . [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)
							30e283d72f919a8de403efe44d7941323bb394b8
 . . . . . . . . . . . . . . . . [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 (12 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'gpex.org'
 . . . . . . . . . . . . . . . . [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 (243 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes)
							00ee007500e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016786a70df9000004030046304402205370106a7657667179ae54a730f62d81b22756389acc79d50ae3ad44ed541a1d02204af346767a19508edf299fcf8569886eabfcd146f80c501ca41103a3ad28e29d00750063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016786a70fe4000004030046304402203303d6cf3a7fef721bef90a561257673439065311e796d753c9117c1fa35f2da02202d5399eba3b72f5be268655e03846979ac695e1a0bb23391bc36792c6cc7215e
 . . . . [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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