colore.net

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:dc:e0:08:3f:e7:d6:30:22:53:c4:72:a6:03:05:07:58:2e 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=colore.net

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:dc:e0:08:3f:e7:d6:30:22:53:c4:72:a6:03:05:07:58:2e
Serial Number (int): 336496768423477689889462696942549904873518
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 13:85:8e:03:16:a2:b8:e5:46:22:48:09:ae:40:4e:2c:a5:8f:0b:80
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 9a:81:3a:5a:de:4e:b5:41:9d:0a:7f:d1:b7:61:c5:ed:d7:68:70:9a
Fingerprint (sha256): 01:95:2f:a5:e4:47:ac:e8:56:8e:45:0b:ea:f0:4a:54:73:9e:e6:f3:bc:c8:47:aa:57:74:3f:4f:a0:0e:fa:1c

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 colore.net

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for colore.net

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

colore.net

Other certificates including the domain name colore.net

(limited to 100 certificates)
colore.net
www.colore.net
www.colore.net
www.colore.net
www.colore.net
www.hjaco.com
www.colore.net
www.luckmail.net
colore.net
soberblog.net
colore.net
colore.net
colore.net
colore.net
www.colore.net
bagnolomella.net
www.colore.net

Certificate

The complete raw certificate details for colore.net 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 336496768423477689889462696942549904873518
 . . . . . . . . [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 2019-12-24 16:40:59 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-03-23 16:40:59 +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 'colore.net'
 . . . . . . . . [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 720031714515747829107070544861026113777946787600101852333420260771738769805943557489372076014172956475113830833382463573723714095120709183033486486521819049870699520905200736342592180607744688056795622914036894643669711757995980099335206618101513868863255437188008124653532614888091875608516876751627674408338055531785446993138376176686845806086628866620235630302197057721656982488990262333716150304648426410265939221116006864834504158523764880361871414828822259659130764394219043600337847410585651117452981893517634597992964211853967960043456991815691503682971938627471697469022814349711672393851436097488707743584390131359347302785602571108138536337775116174312164706037125330084836373749338696882284509782249353232668709872182368915599975248377567642115660786417433642731047847696751752763285869872167205198092414448183321585361716569695650399096522001328448047759770094373183267209645913420134018489330157059443331946007252624078253128071571883512201515546177531263990163167830918341042662315202413592361007994395461151703628910927123495748142202050399400312722993833810129993341724645298057998212705368507295204970433939202796899934256093465266025039484451752782096159908742175705191070615467115449659041481016814675943934113811
 . . . . . . . . . . . . . . . . . . . . [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)
							13858e0316a2b8e546224809ae404e2ca58f0b80
 . . . . . . . . . . . . . . . . [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 (14 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'colore.net'
 . . . . . . . . . . . . . . . . [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)
							00f2007700f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000016f38ff64ac00000403004830460221009583b66ad293b2f86a39153626c606c4680a3b63c7bafab59981e43c30088091022100e16accbd12240038333b9795d616459a164ae460cd9077e4f992490fcf943ac900770007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016f38ff64fc0000040300483046022100850847304e90ae7f0232893156093a2b8018f4ca515047d186901b9ad9949572022100bbdd91ea25604a59c88b540766b9e2a80d1155998e69851fbbe3ed1f4c2cb44f
 . . . . [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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