deutscherwebmasterblog.de

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:24:69:e3:6b:7c:31:54:94:8e:bd:e7:bc:fa:92:8e:59:ce was issued on by Let's Encrypt.

With 5 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=deutscherwebmasterblog.de

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:24:69:e3:6b:7c:31:54:94:8e:bd:e7:bc:fa:92:8e:59:ce
Serial Number (int): 360840058707196461602994628039795423467982
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: e8:25:60:57:83:ee:0b:e0:2e:8d:8f:e4:a3:eb:fe:e1:31:e7:06:88
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 24:c9:15:b8:ea:d1:d1:58:3a:93:2d:61:5b:ae:0d:0d:b6:b0:e9:d7
Fingerprint (sha256): 54:95:cb:e9:89:92:45:7e:9f:38:a2:66:6a:89:25:7a:e6:d8:12:62:5d:5f:36:86:4d:39:18:57:c4:ab:22:67

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate deutscherwebmasterblog.de

5

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for deutscherwebmasterblog.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

8 extensions
No unhandled critical extensions

CA Certificate

This is not a CA certificate

Subject Alternative Names

autodiscover.deutscherwebmasterblog.de
deutscherwebmasterblog.de
mail.deutscherwebmasterblog.de
webdisk.deutscherwebmasterblog.de
www.deutscherwebmasterblog.de

Other certificates including the domain name deutscherwebmasterblog.de

(limited to 100 certificates)
deutscherwebmasterblog.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
hurghadareise.de
www.onlinekredit-01.t6a.de
*.versicherungenkredite.de
marktplatzb2b.de
deutscherwebmasterblog.de
kreditkarte.name
deutscherwebmasterblog.de
deutscherwebmasterblog.de
babyskinderwagen.de
deutscherwebmasterblog.de
www.schnuggi91.t6a.de
jannes-falter.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
jobsuche-international.de
johanneskraut.eu
deutscherwebmasterblog.de
deutscherwebmasterblog.de
thalheimerzgebirge.de
deutscherwebmasterblog.de
fluegel-falter.de
deutscherwebmasterblog.de
*.t6a.de
deutscherwebmasterblog.de
dirndl-mini.t6a.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
www.bauzinsrechner.eu
thalheimerzgebirge.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
kosmetik-forum.t6a.de
deutscherwebmasterblog.de
deutscherwebmasterblog.de
cpcontacts.diwandecken.de
deutscherwebmasterblog.de

Certificate

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

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0zT1Y7e94Z7GrcP0v4+G
OVZ0bFemnPjr99yoiMCaBs+ow1blP7CuZQHS01vei/2Z0NJwXXf4lC8OC4FHSX0Q
TfBWQxi4sjXA24nnDf9FSyJRKupfohxMU0L3rqXup13nMbDgKQqQfQ5COZBKpUyC
hxla6aDsDQWmVdCe9YbeHsUxjkFA7raR2seWIKmmPrjuWuEHS6l3FgqyOHCvWfXT
sLz6PRGGnuPH3gKtaFZ1J2mLdPc5Go36djl8ywwhStmeDLwhTXrVow+yKDH5t5aK
O1cghLbHkcDCDSyGrozj3opz31hztnofjqOsqezXRz463O1lzJktfWqW9IZ0XJ5S
/wIDAQAB
-----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 360840058707196461602994628039795423467982
 . . . . . . . . [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 2018-02-03 00:33:14 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-05-04 00:33:14 +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 'deutscherwebmasterblog.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 26662397183548142361628623205230493439079844513530633913029988193058446503932112728726399351359909094441707392907445030387056798555935901390176174761341352038007358694344691159810325977249275123358916660344636638978099412825060009248014645453674224761256990516328543123621333983124466829083297824964273289033358816371502804841531466489434960563418759362112884743213151384976195912465644815018072245411479433784823931226453252213982831113761426780969247066956163908462896592541697594017704635678498411556210631262994865745880615419383557725590496107192310290198497514944199844157816848147479750025387340228776620348159
 . . . . . . . . . . . . . . . . . . . . [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)
							e825605783ee0be02e8d8fe4a3ebfee131e70688
 . . . . . . . . . . . . . . . . [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 (168 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.deutscherwebmasterblog.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'deutscherwebmasterblog.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.deutscherwebmasterblog.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.deutscherwebmasterblog.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.deutscherwebmasterblog.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 (246 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 1.3.6.1.5.5.7.2.2 (unotice)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/'
 . . . . [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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