mail.candcservices.org

Issued by Go Daddy Secure Certification Authority

About this certificate


This digital certificate with serial number 4e:85:33:93:91:45:0d was issued on by GoDaddy.com, Inc. .

With 6 subject alternative names this certificate can be used to secure multiple fqdn's. While the 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.

Cerificate errors/warnings *beta

  • ERROR: Certificate subjectAltName '[cc-dc]' contains an internal server name
  • ERROR: Certificate subjectAltName '[cc-dc.ccs.local]' contains an internal server name

mail.candcservices.org

Organization unit: Domain Control Validated

GoDaddy.com, Inc.

Company registration number: 07969287
Organization: GoDaddy.com, Inc.
Organization unit: http://certificates.godaddy.com/repository

Time since certificate expired

This certificate has expire since

Certificate Details

Serial Number (hex): 4e:85:33:93:91:45:0d
Serial Number (int): 22101504749028621
Serial Number lenght: 55 bits, 7 octets

SubjectKeyId: 82:b0:e0:fe:58:d1:79:db:0d:54:1a:1b:62:ec:02:29:ce:7d:63:0b
AuthorityKeyId: fd:ac:61:32:93:6c:45:d6:e2:ee:85:5f:9a:ba:e7:76:99:68:cc:e7

Fingerprint (sha1): 84:f1:69:45:c6:47:bb:11:7b:5d:0b:a1:f5:41:4b:c1:1e:d1:44:a0
Fingerprint (sha256): e7:18:f8:17:f0:c7:fe:2d:1b:d8:51:3d:3a:15:09:5e:07:ac:7c:fd:22:3f:19:7d:ff:53:9f:5b:90:64:4c:f6

Issuing Certificate URL: http://certificates.godaddy.com/repository/gd_intermediate.crt

Revocation information

OCSP Server: http://ocsp.godaddy.com/
CRL Distribution Point: http://crl.godaddy.com/gds1-112.crl

Check the revocation status for the current certificate on mail.candcservices.org
6
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details about this certificate


Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA1 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

mail.candcservices.org
www.mail.candcservices.org
autodiscover.candcservices.org
cc-dc
cc-dc.ccs.local
www.mail.candcservices.org

Certificate

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

Certificate (PEM)

-----BEGIN CERTIFICATE----- MIIFtzCCBJ+gAwIBAgIHToUzk5FFDTANBgkqhkiG9w0BAQUFADCByjELMAkGA1UE BhMCVVMxEDAOBgNVBAgTB0FyaXpvbmExEzARBgNVBAcTClNjb3R0c2RhbGUxGjAY BgNVBAoTEUdvRGFkZHkuY29tLCBJbmMuMTMwMQYDVQQLEypodHRwOi8vY2VydGlm aWNhdGVzLmdvZGFkZHkuY29tL3JlcG9zaXRvcnkxMDAuBgNVBAMTJ0dvIERhZGR5 IFNlY3VyZSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTERMA8GA1UEBRMIMDc5Njky ODcwHhcNMTQwODE5MTgzNzA5WhcNMTUwOTIzMjAzMzU2WjBEMSEwHwYDVQQLExhE b21haW4gQ29udHJvbCBWYWxpZGF0ZWQxHzAdBgNVBAMTFm1haWwuY2FuZGNzZXJ2 aWNlcy5vcmcwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDRNXhn3NQV 7qNFa74rrdxBT7zV+LWVLjcpNcqaQOeKz2B3IDrWf38vz0CLJ6cIPqfKUGWn4XyC nd1OJvdoIh98rp3u7fmK5yzQ/EEtxySQTwZU5CZVj5TAFWYFMPvbirmP7kQBOykB rax+rtPdDBl8UD5kqF4RgLIkqaAfcVbGB5haSX4ii2AjfZ90KCVeHs/bKczO9da6 Jw8/z8dEtVZixOwYGDHZ/Wnbbz99pN+bhfCkrKWygngd8N2qaLVeRYapRwGQ9LkV rVomnB5ul9UVJXxZIVY9UMaqu8sKncbTAHZRvdniLilKqlM3ASuF03aUFeqjLhGS DiKlAZM5RknzAgMBAAGjggIlMIICITAMBgNVHRMBAf8EAjAAMB0GA1UdJQQWMBQG CCsGAQUFBwMBBggrBgEFBQcDAjAOBgNVHQ8BAf8EBAMCBaAwNAYDVR0fBC0wKzAp oCegJYYjaHR0cDovL2NybC5nb2RhZGR5LmNvbS9nZHMxLTExMi5jcmwwUwYDVR0g BEwwSjBIBgtghkgBhv1tAQcXATA5MDcGCCsGAQUFBwIBFitodHRwOi8vY2VydGlm aWNhdGVzLmdvZGFkZHkuY29tL3JlcG9zaXRvcnkvMIGABggrBgEFBQcBAQR0MHIw JAYIKwYBBQUHMAGGGGh0dHA6Ly9vY3NwLmdvZGFkZHkuY29tLzBKBggrBgEFBQcw AoY+aHR0cDovL2NlcnRpZmljYXRlcy5nb2RhZGR5LmNvbS9yZXBvc2l0b3J5L2dk X2ludGVybWVkaWF0ZS5jcnQwHwYDVR0jBBgwFoAU/axhMpNsRdbi7oVfmrrndplo zOcwgZMGA1UdEQSBizCBiIIWbWFpbC5jYW5kY3NlcnZpY2VzLm9yZ4Iad3d3Lm1h aWwuY2FuZGNzZXJ2aWNlcy5vcmeCHmF1dG9kaXNjb3Zlci5jYW5kY3NlcnZpY2Vz Lm9yZ4IFY2MtZGOCD2NjLWRjLmNjcy5sb2NhbIIad3d3Lm1haWwuY2FuZGNzZXJ2 aWNlcy5vcmcwHQYDVR0OBBYEFIKw4P5Y0XnbDVQaG2LsAinOfWMLMA0GCSqGSIb3 DQEBBQUAA4IBAQAA/QnCi0ZBYwo4YPeU1dZFhJctA4QmU/2HrMXqIYQpNmXRGQfd Biq6KwnmqiSfjxjjRiyhe9PWVuZ5hfjQGiIbWXMekeSrPMPbPXzNMnDUXvoBD+nu a896wJIszZiDmnCXbD1QiW+7EA8R73I4rLvgnecR0gK8PHM+VI6P4JoDftcIeUWY krRvxi8MvURr8hn6w//IEaFq2O37Wj53Bu+/lZ3Gn+kHkPULPYS9LB0QydqLIKXn Uyeel7aNEXvW8bT1dZJwSuwTf4oivSp+xfkPSHeNmD/9uAezwetlV8CfW0sIOMci cWEXSBSmcLsq6pDTmyHKbqn1LueOh+6t1bmm -----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0TV4Z9zUFe6jRWu+K63c QU+81fi1lS43KTXKmkDnis9gdyA61n9/L89AiyenCD6nylBlp+F8gp3dTib3aCIf fK6d7u35iucs0PxBLcckkE8GVOQmVY+UwBVmBTD724q5j+5EATspAa2sfq7T3QwZ fFA+ZKheEYCyJKmgH3FWxgeYWkl+IotgI32fdCglXh7P2ynMzvXWuicPP8/HRLVW YsTsGBgx2f1p228/faTfm4XwpKylsoJ4HfDdqmi1XkWGqUcBkPS5Fa1aJpwebpfV FSV8WSFWPVDGqrvLCp3G0wB2Ub3Z4i4pSqpTNwErhdN2lBXqoy4Rkg4ipQGTOUZJ 8wIDAQAB -----END PUBLIC KEY-----

ASN1 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 22101504749028621 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.5 (sha1WithRSAEncryption) . . . . . . . . . . . . [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 'Arizona' . . . . . . . . . . . . [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 'Scottsdale' . . . . . . . . . . . . [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 'GoDaddy.com, Inc.' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'http://certificates.godaddy.com/repository' . . . . . . . . . . . . [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 'Go Daddy Secure Certification Authority' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.5 (serialNumber) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString '07969287' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2014-08-19 18:37:09 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2015-09-23 20:33:56 +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 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Domain Control Validated' . . . . . . . . . . . . [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 'mail.candcservices.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 26410172942724029245848531342724006743956013863284389550733556077282591369050805466215702042946203505605994633368092595183265544664918946727123545263351083707260483957093344161798407155001970440832254906910121934967986913986052190192985949002148943276185260339162986920601005483200790998965703785021668600313217168841449679661665973718594929355282293458914731608102501929163384180886943553520322309394459685077979963607970951962412773388476786190197633626514363545134355001515534531287421973343011481047879654204831247144469385505429688872100999943713781152867045028645203872040124868530447086639592855317155143895539 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.19 (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 2.5.29.15 (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 2.5.29.31 (cRLDistributionPoints) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (45 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.godaddy.com/gds1-112.crl' . . . . . . . . . . . . . . . . [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 (76 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.16.840.1.114413.1.7.23.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://certificates.godaddy.com/repository/' . . . . . . . . . . . . . . . . [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 (116 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.godaddy.com/' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://certificates.godaddy.com/repository/gd_intermediate.crt' . . . . . . . . . . . . . . . . [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 fdac6132936c45d6e2ee855f9abae7769968cce7 . . . . . . . . . . . . . . . . [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 (139 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.candcservices.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.mail.candcservices.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.candcservices.org' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cc-dc' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cc-dc.ccs.local' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.mail.candcservices.org' . . . . . . . . . . . . . . . . [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) 82b0e0fe58d179db0d541a1b62ec0229ce7d630b . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.5 (sha1WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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