blog.xqueue.de
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 04:d2:0f:98:6f:54:32:83:4c:6c:ad:a4:64:85:49:3f:29:90 was issued on by Let's Encrypt.
With 2 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=blog.xqueue.de
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:d2:0f:98:6f:54:32:83:4c:6c:ad:a4:64:85:49:3f:29:90Serial Number (int): 419929170687515599582909030792250961897872
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: 3a:82:54:af:e8:cb:41:47:15:a6:21:6c:c4:2d:f6:d3:3f:3b:7c:b2
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 38:ac:39:3f:bb:a1:c4:36:c5:e0:9b:a8:b4:51:5d:e5:31:63:c1:75
Fingerprint (sha256): 12:a6:b7:2f:ea:f2:fd:a5:89:4e:aa:5f:20:cd:df:86:ef:a8:b3:54:fa:60:e4:d9:cd:47:a8:be:3f:e2:97:80
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate blog.xqueue.de
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for blog.xqueue.de
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
blog.xqueue.de
www.blog.xqueue.de
www.blog.xqueue.de
Other certificates including the domain name xqueue.de
(limited to 100 certificates)
*.fr.xqueue.de
support.xqueue.de
xqueue.de
support.xqueue.de
*.fr.xqueue.de
blog.xqueue.de
blog.xqueue.de
*.xqueue.de
blog.xqueue.de
support.xqueue.de
*.xqueue.de
xqueue.de
maileon.de
*.xqueue.de
blog.xqueue.de
*.fr.xqueue.de
*.xqueue.de
*.xqueue.de
*.xqueue.de
support.xqueue.de
maileon.de
blog.xqueue.de
xqueue.de
xqueue.de
xqueue.de
blog.xqueue.de
support.xqueue.de
xqueue.de
*.fr.xqueue.de
blog.xqueue.de
*.fr.xqueue.de
*.fr.xqueue.de
support.xqueue.de
manual.maileon.com
support.xqueue.de
support.xqueue.de
xqueue.de
xqueue.de
xqueue.de
support.xqueue.de
xqueue.de
support.xqueue.de
xqueue.de
xqueue.de
blog.xqueue.de
maileon.de
blog.xqueue.de
xqueue.de
blog.xqueue.de
support.xqueue.de
blog.xqueue.de
support.xqueue.de
xqueue.de
*.xqueue.de
*.pf.xqueue.de
xqueue.de
*.pf.xqueue.de
xqueue.de
xqueue.de
support.xqueue.de
xqueue.de
support.xqueue.de
*.fr.xqueue.de
blog.xqueue.de
blog.xqueue.de
*.xqueue.de
blog.xqueue.de
support.xqueue.de
*.xqueue.de
xqueue.de
maileon.de
*.xqueue.de
blog.xqueue.de
*.fr.xqueue.de
*.xqueue.de
*.xqueue.de
*.xqueue.de
support.xqueue.de
maileon.de
blog.xqueue.de
xqueue.de
xqueue.de
xqueue.de
blog.xqueue.de
support.xqueue.de
xqueue.de
*.fr.xqueue.de
blog.xqueue.de
*.fr.xqueue.de
*.fr.xqueue.de
support.xqueue.de
manual.maileon.com
support.xqueue.de
support.xqueue.de
xqueue.de
xqueue.de
xqueue.de
support.xqueue.de
xqueue.de
support.xqueue.de
xqueue.de
xqueue.de
blog.xqueue.de
maileon.de
blog.xqueue.de
xqueue.de
blog.xqueue.de
support.xqueue.de
blog.xqueue.de
support.xqueue.de
xqueue.de
*.xqueue.de
*.pf.xqueue.de
xqueue.de
*.pf.xqueue.de
xqueue.de
xqueue.de
Certificate
The complete raw certificate details for blog.xqueue.de in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFaDCCBFCgAwIBAgISBNIPmG9UMoNMbK2kZIVJPymQMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA1MDYwOTM2NThaFw0x OTA4MDQwOTM2NThaMBkxFzAVBgNVBAMTDmJsb2cueHF1ZXVlLmRlMIIBIjANBgkq hkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvnCPUHSAK+Jmmt0sov4guwKF3jNKsbnG SeMiQRrAWH6pBlct6u/A07rMAoTafnEk8uY1pMjHcx470Wi02w74kaaPJQmOZTEX OIrjYTCQAnebepPNqCRrwLlA3rCicdwldM7F9VRzT4LgyONnBMNfViXYsW/6YHVI 2/FA85JzXd2HjP5FbFQ7BeRWwEa4BLzvarrpnWyhi44tWBjoYsXo/rWmhdeOwfSa Z0T3L31di6UM30y9gWvVaph+jgP1zx/c9CbMxn80ShLHM3EtqAXWkZzkPTcCGKeO HLlkQQf4+3PHhTXM2Qait2EB8KSIAKW0tAz3VVUjqVfalQB1cnNw9QIDAQABo4IC dzCCAnMwDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsGAQUFBwMBBggrBgEF BQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBQ6glSv6MtBRxWmIWzELfbTPzt8 sjAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86jsoTBvBggrBgEFBQcBAQRj MGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14My5sZXRzZW5jcnlwdC5v cmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14My5sZXRzZW5jcnlwdC5v cmcvMC0GA1UdEQQmMCSCDmJsb2cueHF1ZXVlLmRlghJ3d3cuYmxvZy54cXVldWUu ZGUwTAYDVR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEF BQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEEBgorBgEEAdZ5AgQC BIH1BIHyAPAAdgDiaUuuJujpQAnohhu2O4PUPuf+dIj7pI8okwGd3fHb/gAAAWqM t9SMAAAEAwBHMEUCIQDWNGVWwjgUzdvXQbwAfqYqRqtY+t5bzq0T/ColgMMToAIg Yf72GTZfuQjhJWZ1tFOpe1tfTo4Gnc3UpFq79adP+14AdgApPFGWVMg5ZbqqUPxY B9S3b79Yeily3KTDDPTlRUf0eAAAAWqMt9SKAAAEAwBHMEUCIQC2YMAAyDW3Th5N DPLN5hGmwrdNG/EqA6RRoOSu8V20QwIgcWsfJ5o91usSWyOBcqZzkEUpwMOco6rA tnrWtSdO0qgwDQYJKoZIhvcNAQELBQADggEBAFF9Wx1BfpfZdBbLLBALyJXrg1QM x1bUOSdX+W96iBw+KMC3SwiGnZBzHpHUKJ1lCpw/xwfhiQT3ehWKReUmPUpn4Mte P5HrmOL1INK4FETjSHLZ0OjsVGvCsnQNOA8y315xrZKgOp1HNw4nXraSKnuPRvlJ 7hKUn8vc+3BVmhME/kUPbSpGV3527tkmt4qrVfK/u4jXRX/fKAW12aYYI7XjkfIw s5Dh1I5qA70K+7Cgvu2RiHC5aY1CYvCp6XeXxx0pQgJZ6iEnWeQEyYrlGbw6R+1U PCb698ErFN8SH6Ed54DMKckWCj7CVqAHc8UIiPAnBF+QAx0drRI9G3YmDPU= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvnCPUHSAK+Jmmt0sov4g uwKF3jNKsbnGSeMiQRrAWH6pBlct6u/A07rMAoTafnEk8uY1pMjHcx470Wi02w74 kaaPJQmOZTEXOIrjYTCQAnebepPNqCRrwLlA3rCicdwldM7F9VRzT4LgyONnBMNf ViXYsW/6YHVI2/FA85JzXd2HjP5FbFQ7BeRWwEa4BLzvarrpnWyhi44tWBjoYsXo /rWmhdeOwfSaZ0T3L31di6UM30y9gWvVaph+jgP1zx/c9CbMxn80ShLHM3EtqAXW kZzkPTcCGKeOHLlkQQf4+3PHhTXM2Qait2EB8KSIAKW0tAz3VVUjqVfalQB1cnNw 9QIDAQAB -----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 419929170687515599582909030792250961897872 . . . . . . . . [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 2019-05-06 09:36:58 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-08-04 09:36:58 +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 'blog.xqueue.de' . . . . . . . . [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 24040783260193532612184992507776851738777955858106750489886736970598787198590334141721723355321182922347567423663398011771020834550575467768362121306969422814906564578189683662560811269551919625846335441692638760702017269721255569988726001568702396990318374147790822281186227383863077329527620204392126689696853622192269177862389825864840917181835160709531850984920538082772398825179114242142800833744004081479316362071616663249281792625285853134912193888137737356708383641163611313699583985544917607081745460110137442907677868783403895968297585536468586899565591728921835719304656556297545324485295718207226675163381 . . . . . . . . . . . . . . . . . . . . [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) 3a8254afe8cb414715a6216cc42df6d33f3b7cb2 . . . . . . . . . . . . . . . . [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 (38 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'blog.xqueue.de' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.blog.xqueue.de' . . . . . . . . . . . . . . . . [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 (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016a8cb7d48c0000040300473045022100d6346556c23814cddbd741bc007ea62a46ab58fade5bcead13fc2a2580c313a0022061fef619365fb908e1256675b453a97b5b5f4e8e069dcdd4a45abbf5a74ffb5e007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016a8cb7d48a0000040300473045022100b660c000c835b74e1e4d0cf2cde611a6c2b74d1bf12a03a451a0e4aef15db4430220716b1f279a3dd6eb125b238172a673904529c0c39ca3aac0b67ad6b5274ed2a8 . . . . [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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