dsi-mail-srvr.ggmitg.com
- DataSpring, Inc. -
Issued by DigiCert SHA2 Secure Server CA
About this certificate
This digital certificate with serial number 0c:bb:5c:8e:28:85:f9:fd:8d:2e:b3:9a:6d:a4:e5:9e was issued on by DigiCert Inc.
With 3 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)
DataSpring, Inc.
Organization:
DataSpring, Inc.
State / Province:
South Carolina
Locality: North Charleston
Country: US
Locality: North Charleston
Country: US
DigiCert Inc
Organization:
DigiCert Inc
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 0c:bb:5c:8e:28:85:f9:fd:8d:2e:b3:9a:6d:a4:e5:9eSerial Number (int): 16923572706588984293912128670811874718
Serial Number lenght: 124 bits, 16 octets
SubjectKeyId: 77:d1:ad:dc:d5:85:bc:84:e3:d5:5c:bd:38:a8:d7:e4:6b:ab:d5:6d
AuthorityKeyId: 0f:80:61:1c:82:31:61:d5:2f:28:e7:8d:46:38:b4:2c:e1:c6:d9:e2
Fingerprint (sha1): d2:27:96:43:dc:51:c3:bf:18:61:cb:ef:dd:ae:3a:48:53:3e:d3:a3
Fingerprint (sha256): 98:a4:2d:ad:b2:33:8d:c8:23:84:65:ed:83:be:a5:6b:89:52:cf:fd:45:9f:24:b7:56:73:5b:57:96:de:a2:fc
Issuing Certificate URL: http://cacerts.digicert.com/DigiCertSHA2SecureServerCA.crt
Revocation information
OCSP Server: http://ocsp.digicert.comCRL Distribution Point: http://crl3.digicert.com/ssca-sha2-g3.crl
CRL Distribution Point: http://crl4.digicert.com/ssca-sha2-g3.crl
Check the revocation status for certificate dsi-mail-srvr.ggmitg.com
3
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for dsi-mail-srvr.ggmitg.com
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
dsi-mail-srvr.ggmitg.com
mail.dataspringinc.com
autodiscover.dataspringinc.com
mail.dataspringinc.com
autodiscover.dataspringinc.com
Other certificates including the domain name ggmitg.com
(limited to 100 certificates)
Certificate
The complete raw certificate details for dsi-mail-srvr.ggmitg.com in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFZTCCBE2gAwIBAgIQDLtcjiiF+f2NLrOabaTlnjANBgkqhkiG9w0BAQsFADBN MQswCQYDVQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMScwJQYDVQQDEx5E aWdpQ2VydCBTSEEyIFNlY3VyZSBTZXJ2ZXIgQ0EwHhcNMTQxMTExMDAwMDAwWhcN MTYwMTE1MTIwMDAwWjB/MQswCQYDVQQGEwJVUzEXMBUGA1UECBMOU291dGggQ2Fy b2xpbmExGTAXBgNVBAcTEE5vcnRoIENoYXJsZXN0b24xGTAXBgNVBAoTEERhdGFT cHJpbmcsIEluYy4xITAfBgNVBAMTGGRzaS1tYWlsLXNydnIuZ2dtaXRnLmNvbTCC ASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMn5eYYYa860SYqQqxgz+vez wbEhiF9uRiDX4QCsXaxBP3TFhbyBWZyAoWgRkD429EOwn7rqArYgKAKkmCqNi3oW nt7/BO/HRcXiTk+S7suARMpjUYs96YRcuow+x0OZ3xwVUcb4hAYgOMTJN3Wk5Ie/ 6DtBjDrbihamPlWm6G/rOQx/+E0/fbbFpT7Nqvls8mwYCazZxdbyQA7SqGLRtzDv HsvShqEaKTOWmXWLLObUpQD/d9Xw8IzwdH9gEnUKWuNRURnrX1B0+4IlTZzIPiJB KvpOqzcXHy6m+hrzMeysnwHKZmNlamHN6j96kLl8gu/24bYebhX7mD/NI37OKvcC AwEAAaOCAg0wggIJMB8GA1UdIwQYMBaAFA+AYRyCMWHVLyjnjUY4tCzhxtniMB0G A1UdDgQWBBR30a3c1YW8hOPVXL04qNfka6vVbTBbBgNVHREEVDBSghhkc2ktbWFp bC1zcnZyLmdnbWl0Zy5jb22CFm1haWwuZGF0YXNwcmluZ2luYy5jb22CHmF1dG9k aXNjb3Zlci5kYXRhc3ByaW5naW5jLmNvbTAOBgNVHQ8BAf8EBAMCBaAwHQYDVR0l BBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMGsGA1UdHwRkMGIwL6AtoCuGKWh0dHA6 Ly9jcmwzLmRpZ2ljZXJ0LmNvbS9zc2NhLXNoYTItZzMuY3JsMC+gLaArhilodHRw Oi8vY3JsNC5kaWdpY2VydC5jb20vc3NjYS1zaGEyLWczLmNybDBCBgNVHSAEOzA5 MDcGCWCGSAGG/WwBATAqMCgGCCsGAQUFBwIBFhxodHRwczovL3d3dy5kaWdpY2Vy dC5jb20vQ1BTMHwGCCsGAQUFBwEBBHAwbjAkBggrBgEFBQcwAYYYaHR0cDovL29j c3AuZGlnaWNlcnQuY29tMEYGCCsGAQUFBzAChjpodHRwOi8vY2FjZXJ0cy5kaWdp Y2VydC5jb20vRGlnaUNlcnRTSEEyU2VjdXJlU2VydmVyQ0EuY3J0MAwGA1UdEwEB /wQCMAAwDQYJKoZIhvcNAQELBQADggEBABRNNVi9FLOWqWCTIBbYKC6TDD7ptBor lUpwki//V0abALxWROSgqLZW+/O6xhK9oY3/1Ou3hhjL260iLk62m3wQ0f31FW5w zm6sFHZxEuQvMjyxu/rP5nFbdkpHtBlzNnKySSw+R34D0bml2eGBqqJF9M04jwIi Dti+oAs1xIRrpiSX7Wf62m5Q1/vRmc75yoLCx7SREsfhfU+X97I4BlHAlwycs8qh 0BlkY3grDMV3iT8D7OBk2QZWfanBLLC814Ufql1X/uVJN4tLLa6+qX0zsoDK9QzX 7UZdrAgAg+gLRjtII17FInxQmnURntXaEkK8vLiRDNC+DzQOkVwuwD8= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyfl5hhhrzrRJipCrGDP6 97PBsSGIX25GINfhAKxdrEE/dMWFvIFZnIChaBGQPjb0Q7CfuuoCtiAoAqSYKo2L ehae3v8E78dFxeJOT5Luy4BEymNRiz3phFy6jD7HQ5nfHBVRxviEBiA4xMk3daTk h7/oO0GMOtuKFqY+Vabob+s5DH/4TT99tsWlPs2q+WzybBgJrNnF1vJADtKoYtG3 MO8ey9KGoRopM5aZdYss5tSlAP931fDwjPB0f2ASdQpa41FRGetfUHT7giVNnMg+ IkEq+k6rNxcfLqb6GvMx7KyfAcpmY2VqYc3qP3qQuXyC7/bhth5uFfuYP80jfs4q 9wIDAQAB -----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 16923572706588984293912128670811874718 . . . . . . . . [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 'DigiCert 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 'DigiCert SHA2 Secure Server CA' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2014-11-11 00:00:00 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2016-01-15 12:00:00 +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 2.5.4.6 (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 'South Carolina' . . . . . . . . . . . . [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 'North Charleston' . . . . . . . . . . . . [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 'DataSpring, 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 'dsi-mail-srvr.ggmitg.com' . . . . . . . . [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 25496919858962101965289227554028111304292117890767672466434737562138581862919500546043748943736819240338935096592213845573357415453133745093575304645779045752975064717669076003144100380012767503678080202900566169026139733837821059736343877268194619290572133619899276950412884616237098576104174313139653965475810479494441147353256020581554632882663096290640575320577936144823732677341089697215183363955602490258257628084715076430966565098592412251121875470383491489124258587287774942972630751804001371140138678997386024861171801567673852527380982355699911602026676536213709448247674877482935242353518431842824444848887 . . . . . . . . . . . . . . . . . . . . [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 0f80611c823161d52f28e78d4638b42ce1c6d9e2 . . . . . . . . . . . . . . . . [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) 77d1addcd585bc84e3d55cbd38a8d7e46babd56d . . . . . . . . . . . . . . . . [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 (84 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'dsi-mail-srvr.ggmitg.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.dataspringinc.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.dataspringinc.com' . . . . . . . . . . . . . . . . [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 2.5.29.31 (cRLDistributionPoints) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (100 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://crl3.digicert.com/ssca-sha2-g3.crl' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://crl4.digicert.com/ssca-sha2-g3.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 (59 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.16.840.1.114412.1.1 (digiCertOVCert) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://www.digicert.com/CPS' . . . . . . . . . . . . . . . . [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 (112 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.digicert.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://cacerts.digicert.com/DigiCertSHA2SecureServerCA.crt' . . . . . . . . . . . . . . . . [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 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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