babysamples.org
Issued by cPanel, Inc. Certification Authority
About this certificate
This digital certificate with serial number 31:28:63:b9:3a:e7:cd:a3:af:cc:7c:7c:86:cf:aa:55 was issued on by cPanel, Inc..
With 9 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=babysamples.org
cPanel, Inc.
Organization:
cPanel, Inc.
State / Province:
TX
Locality: Houston
Country: US
Locality: Houston
Country: US
This certificate has expire since
Certificate Details
Serial Number (hex): 31:28:63:b9:3a:e7:cd:a3:af:cc:7c:7c:86:cf:aa:55Serial Number (int): 65341886301793461070287093733899872853
Serial Number lenght: 126 bits, 16 octets
SubjectKeyId: f9:0d:e5:c9:60:e1:7a:a4:d8:6f:c9:ee:7a:5b:f5:d6:03:90:1c:70
AuthorityKeyId: 7e:03:5a:65:41:6b:a7:7e:0a:e1:b8:9d:08:ea:1d:8e:1d:6a:c7:65
Fingerprint (sha1): 4a:03:2d:48:d0:fd:f7:94:55:44:e6:27:82:17:a7:23:5a:de:fc:75
Fingerprint (sha256): ab:14:cf:00:4d:c0:23:4c:5f:e4:9c:72:a5:bf:e5:b0:3a:4f:d2:5c:90:d2:f3:41:5f:d2:4c:df:13:9f:d7:0b
Issuing Certificate URL: http://crt.comodoca.com/cPanelIncCertificationAuthority.crt
Revocation information
OCSP Server: http://ocsp.comodoca.comCRL Distribution Point: http://crl.comodoca.com/cPanelIncCertificationAuthority.crl
Check the revocation status for certificate babysamples.org
9
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for babysamples.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
babysamples.org
autodiscover.babysamples.org
babysamples.bootstoasses.info
cpanel.babysamples.org
mail.babysamples.org
webdisk.babysamples.org
webmail.babysamples.org
www.babysamples.bootstoasses.info
www.babysamples.org
autodiscover.babysamples.org
babysamples.bootstoasses.info
cpanel.babysamples.org
mail.babysamples.org
webdisk.babysamples.org
webmail.babysamples.org
www.babysamples.bootstoasses.info
www.babysamples.org
Other certificates including the domain name babysamples.org
(limited to 100 certificates)
Certificate
The complete raw certificate details for babysamples.org in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFqzCCBJOgAwIBAgIQMShjuTrnzaOvzHx8hs+qVTANBgkqhkiG9w0BAQsFADBy MQswCQYDVQQGEwJVUzELMAkGA1UECBMCVFgxEDAOBgNVBAcTB0hvdXN0b24xFTAT BgNVBAoTDGNQYW5lbCwgSW5jLjEtMCsGA1UEAxMkY1BhbmVsLCBJbmMuIENlcnRp ZmljYXRpb24gQXV0aG9yaXR5MB4XDTE3MDQxODAwMDAwMFoXDTE3MDcxNzIzNTk1 OVowGjEYMBYGA1UEAxMPYmFieXNhbXBsZXMub3JnMIIBIjANBgkqhkiG9w0BAQEF AAOCAQ8AMIIBCgKCAQEA9AIDDg93U/3TTQ5VuMKVOaUAA7nEslxPP/lBl+2FsgM6 9f6EXx7PwXnIFM7OjdiRdRnb3fyYkQnq0dy2K4gF5nt1I/fOs8ZXhk/CoDqOkx94 AfT+XpwKo76zcZ8rd0DYaLOUGORwo/X1X2Le03cSHnsXHwcrLEqbYbn+7vEgfnPc v3R9E20Kkex2ZrB30WolaVwoZSykHcM+ex+E1dTkdUDpphJe4MbgKd1jxFUvr6b8 JZ72JrEDUM5TRuqrJhHkklmi8qQXmpMkBjMorDCoqXXGzEexGs5UPT6xKN8l9YNV kzLBaNxeqzJ6M8pIQRAMdSbnaAeKLSYmmhAY7tYkmQIDAQABo4ICkzCCAo8wHwYD VR0jBBgwFoAUfgNaZUFrp34K4bidCOodjh1qx2UwHQYDVR0OBBYEFPkN5clg4Xqk 2G/J7npb9dYDkBxwMA4GA1UdDwEB/wQEAwIFoDAMBgNVHRMBAf8EAjAAMB0GA1Ud JQQWMBQGCCsGAQUFBwMBBggrBgEFBQcDAjBPBgNVHSAESDBGMDoGCysGAQQBsjEB AgI0MCswKQYIKwYBBQUHAgEWHWh0dHBzOi8vc2VjdXJlLmNvbW9kby5jb20vQ1BT MAgGBmeBDAECATBMBgNVHR8ERTBDMEGgP6A9hjtodHRwOi8vY3JsLmNvbW9kb2Nh LmNvbS9jUGFuZWxJbmNDZXJ0aWZpY2F0aW9uQXV0aG9yaXR5LmNybDB9BggrBgEF BQcBAQRxMG8wRwYIKwYBBQUHMAKGO2h0dHA6Ly9jcnQuY29tb2RvY2EuY29tL2NQ YW5lbEluY0NlcnRpZmljYXRpb25BdXRob3JpdHkuY3J0MCQGCCsGAQUFBzABhhho dHRwOi8vb2NzcC5jb21vZG9jYS5jb20wgfEGA1UdEQSB6TCB5oIPYmFieXNhbXBs ZXMub3JnghxhdXRvZGlzY292ZXIuYmFieXNhbXBsZXMub3Jngh1iYWJ5c2FtcGxl cy5ib290c3RvYXNzZXMuaW5mb4IWY3BhbmVsLmJhYnlzYW1wbGVzLm9yZ4IUbWFp bC5iYWJ5c2FtcGxlcy5vcmeCF3dlYmRpc2suYmFieXNhbXBsZXMub3Jnghd3ZWJt YWlsLmJhYnlzYW1wbGVzLm9yZ4Ihd3d3LmJhYnlzYW1wbGVzLmJvb3RzdG9hc3Nl cy5pbmZvghN3d3cuYmFieXNhbXBsZXMub3JnMA0GCSqGSIb3DQEBCwUAA4IBAQAj 9P3A3TlntZVlaFCQjNSnzUVuTnRi7Rc0giH/0uiP26tNHeIbAr7YvUHzYgiutxH5 43LD/QS8Cw2q9nxUONTl5mHvP0sxdLLewkDiRo2gzJp9BtrsWKF7PcojJqQNFrop SWZbN1WaovuqHVhkjh6ETbRoYq8zI/S1hrecRhA2DlLQVMyIIr1d/ktUcdhbaWkw UqO5wAVMbRQoAINjRvljlrA/yc5o+PZTH5Sx184054fXDMJ9LwnM4gG8wIDyaK+l EUyLXHRle5vpepL4c6H/YhBjgGdHiA9gprKRpEahb3SIt7SV60k1VqFLMfSc6z6/ BQovlKnfL4Qkmf/N9FwY -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA9AIDDg93U/3TTQ5VuMKV OaUAA7nEslxPP/lBl+2FsgM69f6EXx7PwXnIFM7OjdiRdRnb3fyYkQnq0dy2K4gF 5nt1I/fOs8ZXhk/CoDqOkx94AfT+XpwKo76zcZ8rd0DYaLOUGORwo/X1X2Le03cS HnsXHwcrLEqbYbn+7vEgfnPcv3R9E20Kkex2ZrB30WolaVwoZSykHcM+ex+E1dTk dUDpphJe4MbgKd1jxFUvr6b8JZ72JrEDUM5TRuqrJhHkklmi8qQXmpMkBjMorDCo qXXGzEexGs5UPT6xKN8l9YNVkzLBaNxeqzJ6M8pIQRAMdSbnaAeKLSYmmhAY7tYk mQIDAQAB -----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 65341886301793461070287093733899872853 . . . . . . . . [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 2.5.4.8 (stateOrProvinceName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'TX' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.7 (localityName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Houston' . . . . . . . . . . . . [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 'cPanel, Inc.' . . . . . . . . . . . . [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 'cPanel, Inc. Certification Authority' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2017-04-18 00:00:00 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2017-07-17 23:59:59 +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 'babysamples.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 30803138533002885575563325209493213546464586025148111597937433252451944627145520629259340550791998365747848136642642752635009825262681000931058101876958073819170120422813423296027097801792572319796662263509565930288553943674521762348178201726362631259938144613124854246231305005398707937428540946131667843224174995496546073239693486030161467156383730697488671089247464547586535643558932155246477028876901318672876002571961086802691838051988740025327238246438974423419772609398079745315074518800642833091715720817407318959853437196810936084730846182334800261423616568086597521215661319448525343594700491296138572735641 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 7e035a65416ba77e0ae1b89d08ea1d8e1d6ac765 . . . . . . . . . . . . . . . . [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) f90de5c960e17aa4d86fc9ee7a5bf5d603901c70 . . . . . . . . . . . . . . . . [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 2.5.29.19 (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 2.5.29.37 (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 2.5.29.32 (certificatePolicies) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (72 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.6449.1.2.2.52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 'https://secure.comodo.com/CPS' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 2.5.29.31 (cRLDistributionPoints) . . . . . . . . . . . . . . . . . . . . [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:2|t:0|true] OtherName . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://crl.comodoca.com/cPanelIncCertificationAuthority.crl' . . . . . . . . . . . . . . . . [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 (113 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://crt.comodoca.com/cPanelIncCertificationAuthority.crt' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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.comodoca.com' . . . . . . . . . . . . . . . . [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 (233 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'babysamples.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.babysamples.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'babysamples.bootstoasses.info' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.babysamples.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.babysamples.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.babysamples.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.babysamples.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.babysamples.bootstoasses.info' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.babysamples.org' . . . . [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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