www.chiba-kosodate.jp

Issued by R3

About this certificate

This digital certificate with serial number 03:a7:8c:4f:f5:fb:70:57:81:95:3a:17:3f:09:53:3e:cb:a9 was issued on by Let's Encrypt.

With 2 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:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=www.chiba-kosodate.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:a7:8c:4f:f5:fb:70:57:81:95:3a:17:3f:09:53:3e:cb:a9
Serial Number (int): 318350520171050565607168371610698909666217
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: e6:91:a6:ff:35:ec:3b:7b:2f:6e:71:69:64:16:9d:ea:ea:e2:19:de
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): d1:7c:75:db:64:18:d7:f2:e1:10:77:88:54:7c:c4:a7:e4:30:bf:71
Fingerprint (sha256): 4b:70:e5:05:80:63:77:ca:a4:a9:05:4a:f8:a4:43:29:d3:d6:3e:76:96:2e:97:97:68:74:21:6f:45:4c:90:3f

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate www.chiba-kosodate.jp

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.chiba-kosodate.jp

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

chiba-kosodate.jp
www.chiba-kosodate.jp

Other certificates including the domain name chiba-kosodate.jp

(limited to 100 certificates)
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp
www.chiba-kosodate.jp

Certificate

The complete raw certificate details for www.chiba-kosodate.jp in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAzbu0SPMuskWw5WfxsTD+
jzhokDyyXQLCmiAzhdFAAhA+QFmQMlhdcCQcoLFiXCC4n78sIipP6tCHrmK0kK/B
jc/YMxw7TMiZgNX+J9UuLygM9OBVY2ypVC56wiPuDqnG7WJVae88tkvPnx3YDG6v
HmhagcxZkJsm2YSyiFUxESkzbqWbXHbJjuWO4FYRRsCLA6Qs4jY5ARM6IbV5lSIl
XLp+SNWRVtnpMwdwzbUwv5415SIyIt9EmsXWbUsIUqod/trDiRmu7jnxdyJtHdai
EngOQxUZTkXa0eaml8PzyvRzz07igsfTpAY3qpntpCL86wJaPahvkM4rCqKIPhyB
NQIDAQAB
-----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 318350520171050565607168371610698909666217
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-10-03 07:18:34 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-01 07:18:33 +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.chiba-kosodate.jp'
 . . . . . . . . [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 25971412927636452584482294577101303619603889722872396735286293857867969910316237184895740867097058234508782053028386915856593667092163852497585551031048270980864681219810947630504755229902413317638431197864257459420653201748965497928323951150080913907224356354679484266724932957741641461071542067932816382610262191719496150062511059032105171377586118834156625616382367002684409181487055137160441162864572446292305081756434419863796554838119320979535830905556870686533294776233946864879594915329155166136777816260959556095817127308355947929116218052097745282429828585407188965530541887377921811396530401111915097784629
 . . . . . . . . . . . . . . . . . . . . [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)
							e691a6ff35ec3b7b2f6e716964169deaeae219de
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (44 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'chiba-kosodate.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.chiba-kosodate.jp'
 . . . . . . . . . . . . . . . . [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 (12 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f00075003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018af49e12c200000403004630440220590a058b123816360887a713e2f04d1229d50e8d480904d94583b3b266b1e72f022069dd4a7f9681a787a51f08e350081687fa587abb0f3d89d21e98b9d3b749786c007700eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018af49e12be0000040300483046022100c7e1034f33363450e54047b1a54152ca5eca0dcda54d3c80515bf7df9b91f4d0022100da879db07e37a5cf43924d7031e17b3fa33e2b56b49f6ce30e37e0561023b222
 . . . . [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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