www.fcweissensee03.de

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:7b:75:28:46:e4:82:d2:42:18:9f:7d:2f:3b:a7:86:2e:c9 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.fcweissensee03.de

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:7b:75:28:46:e4:82:d2:42:18:9f:7d:2f:3b:a7:86:2e:c9
Serial Number (int): 390459603663570774689424056069763621072585
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 53:4a:21:fa:89:de:84:8f:2b:77:e2:75:4c:38:47:23:f3:31:3c:10
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): f0:f9:c3:74:f8:32:8b:a0:01:8a:b7:c5:ef:14:ca:d8:d2:4c:f0:a1
Fingerprint (sha256): 59:39:4e:4d:55:b9:55:7a:76:a7:68:ae:b4:cf:1f:58:b2:0b:35:80:36:20:c3:95:f4:bf:43:9f:54:f6:b1:61

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.fcweissensee03.de

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.fcweissensee03.de

Public Key Algorithm

RSA

Key Size

4096

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.fcweissensee03.de

Other certificates including the domain name fcweissensee03.de

(limited to 100 certificates)

Certificate

The complete raw certificate details for www.fcweissensee03.de in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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 390459603663570774689424056069763621072585
 . . . . . . . . [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 2019-12-13 22:12:49 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-12 22:12:49 +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.fcweissensee03.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 (4208 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 981065654934532836370226911340402443051657275659652281815644004982148857288870150187296222436845115236873213444732801701895800927614238690733524665946161490978977479891439627461051717764982013109903825131488792161896857533583553515157479263069927465807470270755854034309267944008215869196611539819299807282342641139440984419408874628648291202427994057829151899608104423569905080979603621191905397218392763366319323435003515338621870458442883816072389715769681045389427781384951242202209738787714433060443068859990169959711502552318290631124928731554614715585516363119583430859084278481240324839913507082658001025213806556185802911791490666690148783567139214127724973716847763677201514186531159295830022436078310504172090300381097649330520248711102465877042477233735720455318421592988271242767647101925090364382452744574176576544084576103953819719530145431155730306264933223009522383445627615384931170092352760584258860412763354292332569207873500659578338400356346666550928458394747918174658538273202447016652881909195992326632209427655472554818081675413173333660528000126353628183410381798318481992250719815534572538727258637090181754805550336948072074402394202026499584414661681707721296899495256243770727084766454190459736482163613
 . . . . . . . . . . . . . . . . . . . . [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)
							534a21fa89de848f2b77e2754c384723f3313c10
 . . . . . . . . . . . . . . . . [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.fcweissensee03.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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f10076006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016f01893e4a000004030047304502201b3052ab2ebecc6100fe83a450dcce4875859983979e79e69393a099e680e4ab02210096c75c3a080e2c0be17ad4539bda63f9ff2650b2720bc6e2510e435eb2cc3f7700770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016f01893e4f0000040300483046022100d87fdbaf90ae4ea81c0ffa435f218268bd068d36a1e91be5f654bc4cc1969d03022100ba819d90d511b8e4a472a8c760b926706cf509115fde6ce4bed335807a59a578
 . . . . [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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