www.klassik.s-fahl.de

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:2a:21:8a:a3:93:c8:5c:00:39:43:d4:a6:c8:f9:3d:25:f8 was issued on by Let's Encrypt.

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=www.klassik.s-fahl.de

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:2a:21:8a:a3:93:c8:5c:00:39:43:d4:a6:c8:f9:3d:25:f8
Serial Number (int): 362785587516289095590991056780108700132856
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 03:b1:48:52:cd:e1:6f:c1:64:6d:11:7f:d1:c2:e9:7d:0f:05:c4:da
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 7d:d9:82:66:c2:c6:bc:3f:84:6f:61:2c:a8:bd:99:c3:b7:28:89:4a
Fingerprint (sha256): 82:74:2b:59:25:d1:c1:d7:fb:a0:f8:41:c4:f6:7f:63:fd:4e:d2:ba:70:55:0d:b4:e8:8d:cf:de:25:1e:ad:52

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 www.klassik.s-fahl.de

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.klassik.s-fahl.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

www.klassik.s-fahl.de

Other certificates including the domain name s-fahl.de

(limited to 100 certificates)
biografie.s-fahl.de
www.s-fahl.de
www.ohg.s-fahl.de
internet.s-fahl.de
www.s-fahl.de
www.s-fahl.de
www.klassik.s-fahl.de
klassik.s-fahl.de
klassik.s-fahl.de
ohg.s-fahl.de
www.klassik.s-fahl.de
www.s-fahl.de
www.biografie.s-fahl.de
www.s-fahl.de
3d.s-fahl.de
www.s-fahl.de
web.s-fahl.de
www.s-fahl.de
www.klassik.s-fahl.de
portfolio.s-fahl.de
deutsch.s-fahl.de
www.s-fahl.de
www.s-fahl.de
www.klassik.s-fahl.de

Certificate

The complete raw certificate details for www.klassik.s-fahl.de in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqNIlMTsfQPXJRjrFJIQD
RaX7UwcN7t5+XCUeEihDo1csDnJGvnyaXiEvMe0Kvo1lJ2PyGJXp6OSJ9HSvUWEz
UzHrMqduToQyU+nQmIl1cmDk/eFfUzfEbq9fsb/0FcOlqFwdjX2wUbamLGYcaW4v
N7kXTCEr1R2dR9gigpAAAt69qaii75yJITBxY9r3khTYN0p9LTGqI8O/DLPZOrll
Ificf26KWwTunmfqBIrhO10NX1xzVF+5J+zOt0kc9pl5jempn5PVof/M5iUDxgEU
ibkUDKFJhnnBa1MtSGz+pQnYUoJ+MzXInE1+On3FzSY2sp9RWvpwRQt0Hn0JOshr
IQIDAQAB
-----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 362785587516289095590991056780108700132856
 . . . . . . . . [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 2018-05-06 15:49:56 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-08-04 15:49:56 +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 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'www.klassik.s-fahl.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 21311661735288802480237343243371657594021734278130053782066921955315588379997727736958260076312491169246124930574324319499067748363533981315478865111143506167370329686753180936243912612078595342941691620072473695141138634983194311842729293533615126873195890024631434156698907566283902432830091506841758770318299644107910712346521100928329983302088458213338210110803764361767127778805348665771616295510459678885631246235947768750212994505769207203018537336797681735285823637373529288828876097937291492136376643319234838543169435129880887030686531382462609733372819203019741292727430674222766832151237834321105514949409
 . . . . . . . . . . . . . . . . . . . . [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)
							03b14852cde16fc1646d117fd1c2e97d0f05c4da
 . . . . . . . . . . . . . . . . [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 (25 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.klassik.s-fahl.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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f00076005581d4c2169036014aea0b9b573c53f0c0e43878702508172fa3aa1d0713d30c00000163365c1edd0000040300473045022100932ae1df42e834a3d1363f9181900dde8d2234d04eff864b88267b4a83d47e1702206562124ed9a441fb00f4233a55b841a5417b0603d168113c9effd3d1e3453c2e007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000163365c1ec6000004030047304502205f2acda1f9bf6339ed043b8e5466f3123f28ce5c6594e3aa9f47e7446fc00630022100c5d4b1861511a903864921e87425d01096ee4c0ee53bc7271b58e53365df39ca
 . . . . [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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