seccommerce.com
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:90:d3:4c:5a:7f:2f:eb:21:73:ea:65:06:3d:07:a7:b0:57 was issued on by Let's Encrypt.
With 6 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=seccommerce.com
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:90:d3:4c:5a:7f:2f:eb:21:73:ea:65:06:3d:07:a7:b0:57Serial Number (int): 310618382189061415593647594686943204978775
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 6d:94:ba:80:cc:e2:5b:c4:f3:e8:42:0e:bc:ee:8b:4e:a6:03:9a:52
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 6a:f8:65:cc:c7:c1:bc:c9:52:2f:8e:a7:5b:0e:09:ba:aa:ac:0a:7b
Fingerprint (sha256): 14:99:82:7a:11:88:b2:3a:b4:61:40:c7:b0:a4:9c:50:29:4e:92:42:e5:8e:7c:f6:b4:1a:a9:81:37:e6:96:f1
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate seccommerce.com
6
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for seccommerce.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
seccommerce.com
seccommerce.de
seccommerce.info
www.seccommerce.com
www.seccommerce.de
www.seccommerce.info
seccommerce.de
seccommerce.info
www.seccommerce.com
www.seccommerce.de
www.seccommerce.info
Other certificates including the domain name seccommerce.com
(limited to 100 certificates)
seccommerce.com
seccommerce.com
secrouter.seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
www.seccommerce.at
www.seccommerce.de
mail.seccommerce.com
*.seccommerce.com
*.seccommerce.com
*.seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
secrouter.seccommerce.de
seccommerce.com
seccommerce.com
www.seccommerce.de
www.seccommerce.at
*.seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
*.seccommerce.com
seccommerce.com
secrouter.seccommerce.de
seccommerce.com
seccommerce.biz
seccommerce.com
*.seccommerce.com
seccommerce.com
seccommerce.com
secrouter.seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
www.seccommerce.at
www.seccommerce.de
mail.seccommerce.com
*.seccommerce.com
*.seccommerce.com
*.seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
secrouter.seccommerce.de
seccommerce.com
seccommerce.com
www.seccommerce.de
www.seccommerce.at
*.seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
seccommerce.com
*.seccommerce.com
seccommerce.com
secrouter.seccommerce.de
seccommerce.com
seccommerce.biz
seccommerce.com
*.seccommerce.com
seccommerce.com
Certificate
The complete raw certificate details for seccommerce.com in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFuDCCBKCgAwIBAgISA5DTTFp/L+shc+plBj0Hp7BXMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTAxMjIxMjA1NDZaFw0x OTA0MjIxMjA1NDZaMBoxGDAWBgNVBAMTD3NlY2NvbW1lcmNlLmNvbTCCASIwDQYJ KoZIhvcNAQEBBQADggEPADCCAQoCggEBALkZ2fIqrC/HYSTAIKnNkAR8u2V2U9g3 UAlYxjOVPsMhs/Wf77UsYamJduYC3sz0EAFBXQKk6PNIhNiYPcqIXnbdwrwD2hHl J63ehVP2VSO/qph0M2f+HitCxZPsH4JZBRW6cGEphIm/BWNdp7OvLIxGRHSgsV4a 6VHCVgBPc5cOJvH0XvvHoRCt9ywmkOOzNxeBKsIAOb6zsMLc/E3ERuN0Fd1M8/Y7 eYJ9e+sPEOgyfd8LGr93QW2fzFk3eEACZSsqnYxUeF0kODNGQnJUD2KDZVlIMEmf F5MnOxTu9VV/m0PtvZFFxh3SeEFK7Qd4iXJ7YTzbxxEWKy7meuxDnncCAwEAAaOC AsYwggLCMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYB BQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUbZS6gMziW8Tz6EIOvO6LTqYD mlIwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEwbwYIKwYBBQUHAQEE YzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMubGV0c2VuY3J5cHQu b3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0c2VuY3J5cHQu b3JnLzB7BgNVHREEdDBygg9zZWNjb21tZXJjZS5jb22CDnNlY2NvbW1lcmNlLmRl ghBzZWNjb21tZXJjZS5pbmZvghN3d3cuc2VjY29tbWVyY2UuY29tghJ3d3cuc2Vj Y29tbWVyY2UuZGWCFHd3dy5zZWNjb21tZXJjZS5pbmZvMEwGA1UdIARFMEMwCAYG Z4EMAQIBMDcGCysGAQQBgt8TAQEBMCgwJgYIKwYBBQUHAgEWGmh0dHA6Ly9jcHMu bGV0c2VuY3J5cHQub3JnMIIBBQYKKwYBBAHWeQIEAgSB9gSB8wDxAHcAdH7agzGt MxCRIZzOJU9CcMK//V5CIAjGNzV55hB7zFYAAAFodaqwBwAABAMASDBGAiEAuVSN 6sQrowASj51enDVqZwCBScz+d/U1BfwH85v9+68CIQCfqNkRWfRmvcxlJmS5a9+c QzLsrM8bRA6D/FK3qUYGVQB2ACk8UZZUyDlluqpQ/FgH1Ldvv1h6KXLcpMMM9OVF R/R4AAABaHWqsBIAAAQDAEcwRQIgSXaQv1BpoWcXOyAImVpV8UnYLWY3Fgsq08gk vdBBcdYCIQDp5E2oH5Pb+Hak75iCOU8BtylR83Hi1amzkFCgW4V/dTANBgkqhkiG 9w0BAQsFAAOCAQEAIH6G4cCKWVs0LujVofKwMhYX5RLxCLi4+FiB0xpTkvcjK1e2 UUo3iFEAHKylNLw/fuIBvLrRPMB9+lfDuM299Zr/HWzf3KDd0ObFO9GVLQF9L1z7 M2VC6lsJMKzp3nYrygf+aVLaaCJ68fVXSy+NG9eyMDK6ioovc7JlEpk+KFsMd+7k rj6vTvQIDjC68vdoNpAOpPSEudK23fhiG6spHlZ5f3h1UT3bUm0SXRDYTuSSoszk 4xfXW3xXfxY9AsRAZIFjN9t0h+WH25sxZkHSr1ZuzyWZUwaaF0twl9REhz6DkRKO RPa0jtR8j/bwupalNEeIG+qqDm1lRIKhKUTMQg== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuRnZ8iqsL8dhJMAgqc2Q BHy7ZXZT2DdQCVjGM5U+wyGz9Z/vtSxhqYl25gLezPQQAUFdAqTo80iE2Jg9yohe dt3CvAPaEeUnrd6FU/ZVI7+qmHQzZ/4eK0LFk+wfglkFFbpwYSmEib8FY12ns68s jEZEdKCxXhrpUcJWAE9zlw4m8fRe+8ehEK33LCaQ47M3F4EqwgA5vrOwwtz8TcRG 43QV3Uzz9jt5gn176w8Q6DJ93wsav3dBbZ/MWTd4QAJlKyqdjFR4XSQ4M0ZCclQP YoNlWUgwSZ8Xkyc7FO71VX+bQ+29kUXGHdJ4QUrtB3iJcnthPNvHERYrLuZ67EOe dwIDAQAB -----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 310618382189061415593647594686943204978775 . . . . . . . . [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 2019-01-22 12:05:46 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-04-22 12:05:46 +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 'seccommerce.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 23366834195222400088444463389376818334094651252038345837419871476439811288098210548994325957624364148802588587677997128574189771820111849454264303895163706071331221979556645628754831056037097791402801389884039006831286664501484276851967107201071145159746890345348455993095590268793268815206384986963755686206295436837158991484787121297253732679089632639524198060825528491275300090277566217337423789384484255321928444387353426676874875596836105078202891452364357034012459478446274981130373141665927082924224157377800840053083286110277269567590878332556307259444051970169289355292858837427288503748070096889778878520951 . . . . . . . . . . . . . . . . . . . . [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) 6d94ba80cce25bc4f3e8420ebcee8b4ea6039a52 . . . . . . . . . . . . . . . . [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 (116 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'seccommerce.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'seccommerce.de' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'seccommerce.info' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.seccommerce.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.seccommerce.de' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.seccommerce.info' . . . . . . . . . . . . . . . . [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 (246 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes) 00f1007700747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016875aab0070000040300483046022100b9548deac42ba300128f9d5e9c356a67008149ccfe77f53505fc07f39bfdfbaf0221009fa8d91159f466bdcc652664b96bdf9c4332ecaccf1b440e83fc52b7a9460655007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016875aab01200000403004730450220497690bf5069a167173b2008995a55f149d82d6637160b2ad3c824bdd04171d6022100e9e44da81f93dbf876a4ef9882394f01b72951f371e2d5a9b39050a05b857f75 . . . . [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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