blog.hermes-net.de

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:97:08:5c:83:2c:fb:05:44:57:fe:df:ca:08:af:3a:0d:a2 was issued on by Let's Encrypt.

With 7 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.hermes-net.de

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:97:08:5c:83:2c:fb:05:44:57:fe:df:ca:08:af:3a:0d:a2
Serial Number (int): 312730609376179096787801184758033857252770
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 0f:da:2a:61:e0:b5:33:ba:ba:41:ab:d6:4e:5c:49:47:46:db:71:49
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): dd:3d:e5:f7:ab:10:d1:96:8e:a1:77:af:3e:4b:10:0c:19:b1:07:5a
Fingerprint (sha256): de:b5:6e:a9:0b:13:1c:4e:b5:06:0f:3e:6a:36:3d:89:6c:be:71:81:3b:f3:5a:f6:bc:4e:73:7b:21:86:2f:bb

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 blog.hermes-net.de

7

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for blog.hermes-net.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.hermes-net.de
genia-life.de
hermes-net.de
search.hermes-net.de
sparrowb.de
www.genia-life.de
www.hermes-net.de

Other certificates including the domain name hermes-net.de

(limited to 100 certificates)
mail.hermes-net.de
hermes-net.de
imap.hermes-net.de
hermes-net.de
www.hermes-net.de
www.hermes-net.de
www.hermes-net.de
www.hermes-net.de
mail.hermes-net.de
www.hermes-net.de
mail.hermes-net.de
mail.hermes-net.de
hermes-net.de
mail.hermes-net.de
mail.hermes-net.de
hermes-net.de
mail.hermes-net.de
www.hermes-net.de
mail.hermes-net.de
www.hermes-net.de
www.hermes-net.de
hermes-net.de
mail.hermes-net.de
hermes-net.de
mail.hermes-net.de
www.hermes-net.de
mail.hermes-net.de
www.hermes-net.de
www.hermes-net.de
mail.hermes-net.de
imap.hermes-net.de
mail.hermes-net.de
mail.hermes-net.de
blog.hermes-net.de
www.hermes-net.de
blog.hermes-net.de

Certificate

The complete raw certificate details for blog.hermes-net.de in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqC0aQByzUkNufY6j54XW
Okpme713M+zJHVjNE6vKZD8iU3BNkC0YMV8yNw8MiCiN52I+6Yg0fpq3SD3d8HHi
Fq3Ai+VJuverrKVu1NKj3O38+Q+snv3D3uCXGsZl+04bEeFfNNRo/Cl1y9fdhnjd
bcyulq7EGntDY4NbLIJyt3AY4PtsHXwhNnSoXorxDfZ1joSDJ/O+JJvozCAUHeop
EluJF7vVoMCMiJN3KbMFIWT1y1p4tYZogc56W7w28tuW4O/IrpddJjdYP7aWxuc7
t1ED2MNZmzS0lyzrj1BTeE2gO/13hFL8q/D/IJbCiuByfTMgfpUKQEltepp/aqm0
8wIDAQAB
-----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 312730609376179096787801184758033857252770
 . . . . . . . . [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 2019-12-26 14:09:55 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-25 14:09:55 +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.hermes-net.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 21230276126082493020964982951967341441565105597238449512032783262990418431680506009238473782235780496552725270324787543052161927573366716397916498236560897896905120170205898249475262764822283256648870564051289256907726150041731528722196661242169279341723382255460051164126833092413075702217692916139516446484303614013362657332316698705760284155327574002164392207890082705505169740377662908737027257644326445486612093008266151482810311973564755544099567620212525013136970592702447319003819457553706392702962659052591168372591017947007757330112761805093835455224501545819857694177863542883321420533640914211562922292467
 . . . . . . . . . . . . . . . . . . . . [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)
							0fda2a61e0b533baba41abd64e5c494746db7149
 . . . . . . . . . . . . . . . . [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 (125 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'blog.hermes-net.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'genia-life.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'hermes-net.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'search.hermes-net.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'sparrowb.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.genia-life.de'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.hermes-net.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 (247 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
							00f20077005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016f42c1d1130000040300483046022100a6cebee7e2546314f83ed9e59cc8a32cbf66e51c45db1016d774f146a037f694022100c1dbcfa64e120d690c7eb2ea832613cdd9ea302223eec738584871893ec1423400770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016f42c1d1020000040300483046022100fc39fb950593e368f07966afbc3a99106c3a4d3340aa9fefdb376077f6b429e2022100bbcdede57854a508a73c52d4c2582c595509af8845ee45cabad32a513373e076
 . . . . [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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