antik.stoffrefugium.de

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:a8:64:28:26:86:13:02:df:fb:0b:f2:23:4c:f3:07:23:b3 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=antik.stoffrefugium.de

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:a8:64:28:26:86:13:02:df:fb:0b:f2:23:4c:f3:07:23:b3
Serial Number (int): 405749712642565503835169915349367632896947
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 57:b8:23:65:fc:5a:d0:ad:de:fd:1a:93:92:c0:fe:04:e3:ce:4e:b4
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 23:e6:f9:b8:24:d9:bb:da:64:65:d2:6e:e4:96:5e:ae:a2:ba:b0:c7
Fingerprint (sha256): ab:50:a3:a6:46:03:3f:b5:82:d5:31:b0:c6:e3:a8:c6:28:ee:cc:fc:dc:6c:cc:7c:44:ae:84:7c:38:fa:fa:3c

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 antik.stoffrefugium.de

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for antik.stoffrefugium.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

antik.stoffrefugium.de

Other certificates including the domain name stoffrefugium.de

(limited to 100 certificates)
www.learn.wetomorrow.one
www.stoffrefugium.de
www.stoffrefugium.de
*.pension-ranke.de
www.mygus.apis.schoolshare.de
www.no-n-a-m-e.2ix.de
www.jonas-der-hacker.lima-city.de
*.pics-for-of.de
www.stabilerolaf.lima-city.de
crazystones.lima-city.de
www.antik.stoffrefugium.de
www.antik.stoffrefugium.de
gittistieblins.lima-city.de
*.gabydueser.de
antik.stoffrefugium.de
www.wilkef.12hp.de
antik.stoffrefugium.de
*.md-st-josef.de
mochsdb.lima-city.de
meine-erotik-fantasy.lima-city.de
meine-erotik-fantasy.lima-city.de
www.stoffrefugium.de
www.nick-bassin.lima-city.de
antik.stoffrefugium.de
asfoto.lima-city.info
www.hov-bus-test.lima-city.de
neuhaus-bonn.lima-city.de
2019.icekey.de
www.dinah-villar.lima-city.de
www.jopau.at
www.fxr1990.lima-city.de
webshop.no-key.info
www.stoffrefugium.de
ulrich-bauer.net
tastenfutzi.lima-city.de
www.antik.stoffrefugium.de
fsmpugjhurchnpc.rfcomputer.de
www.ferienwohnungsunny.de
www.stoffrefugium.de
www.stoffrefugium.de
m.beauty-sun.at
www.anne-sauter180924.lima-city.de
domainforsale.int3rnet.de
antik.stoffrefugium.de
ab.wiesi1.de
www.www.zalar.at
antik.stoffrefugium.de
www.stoffrefugium.de
antik.stoffrefugium.de
web.visagistylist.ch
*.naumann19.de
gceflkhlvhkymut.immo-look.de
gmqmdxvyrpyiiqb.3d-look.eu
store.24-netz.de
*.conntrack.de
www.fanclub-dastraumduo.de
www.stoffrefugium.de
www.antik.stoffrefugium.de
*.ergopraxis-herzing.de
www.sbc2.lima-city.de
www.fitbitdbnav.de.cool
www.nico999.lima-city.de
www.g.schnittlauchgang.de

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA3EKJzqP63zNFNsglsoHN
lYxtdHiPchTE5DUqzJSZCgO+vXI13DW1Khv8R/dsjZduzumQYSayGmqaaJcLnEaa
lGjmSpns8MQpHADR6/3GsWAzBWz0IuUlDVWm94ObTrhG/Leh9LyWIwqMCqAPFfYN
1rYgU0EghGE6guc4vODnZcpSrM2k97b0HbrkYmgRaiH6L3z4VYYPMrTcgRP6s1AL
GwAldgpr6AYjFpTew2mLNc2cPucq2BLNH2OM/GyZJlbGRg4TYS5fP9yjopktrxxu
4lWrGUXNSKTAZY/0BBLTmWDj1+4w3b8FUgpWQvi0ZjHruU/Y0brYN3xUoYDNZpJ/
5wIDAQAB
-----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 405749712642565503835169915349367632896947
 . . . . . . . . [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 2018-11-23 01:52:07 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-02-21 01:52:07 +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 'antik.stoffrefugium.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 27805238355758273475122247746767555804395242110884106044375492228415408120758037086051019500023044911640560070094415096683898812297076766190644908423033848962976828086335456103371365422904926736298826962528528218262321924926410987166327820663660421412209327365760694532993990146260189678301367165662159972699689386915547432849589711108104550251756820241393900753669633531968613951629701737635706290131494647838831541832431087553487922335444151007035200661539442931918958272583243336967777763622553993456588165551073115455424478497434713044873320271247507622942619656107087289788372139869550315032267414431879249690599
 . . . . . . . . . . . . . . . . . . . . [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)
							57b82365fc5ad0addefd1a9392c0fe04e3ce4eb4
 . . . . . . . . . . . . . . . . [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 (26 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'antik.stoffrefugium.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)
							00f0007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc56000001673e7b4d2700000403004730450221008a93fd6f050eecd30d26d6d4d4fdcc51c4f6c0b33ede4032c7b7d5441ae8e6eb022022569b60dab1345a4d6d075cb84ac703a52b4376d7b8908242856d7934834c69007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f478000001673e7b4efe0000040300473045022100a06ca207cfb1c4f9505992d0c9c37fcf5f9bebdf9dd7de1e4d4e7fd02f163da10220640caef425fbb2d9cd5e4884240afa5cfc8eda25dc5e133fbaf4ab3af915195a
 . . . . [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)
		007efc312176289c63ede3cae194fe3a6d017965b9b3e3449754ff80a1c3e2cb234ba854d552b652ce7ee1e804416cd0975c6a3216399046392e81a60142a96e4ba2a9d60fb13414814d70e267ae3f442d09f9be8881ad45bfedf6b8503499eeb7c27c2312a76d84965a7de3761fdb3e20a4817e1096c83c67b345f12572cf2f4bc9bafd06fca53686e60303740368a7222174af40fefba87680b53ea85daec6f5a591d78d32a56d61ebf60e75ae1743f815f77a2d8dd00a8cc2e6a548843b979b9af1e98ad4f194e560a06c57a8e9886f4f98202bdabf8f7287d3c77fbe65efa11ca673c3e535ee66b6de790f14d761f44e14f748b9439e9ecefcf33e6b9d2f41