kotubankyousei.biz

Issued by R3

About this certificate

This digital certificate with serial number 04:52:cd:fb:84:b4:dd:d1:aa:a5:c6:69:6a:db:f1:ed:bc:d3 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=kotubankyousei.biz

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:52:cd:fb:84:b4:dd:d1:aa:a5:c6:69:6a:db:f1:ed:bc:d3
Serial Number (int): 376626095511813127179287562803019233737939
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 34:f9:33:1a:67:73:b4:02:c8:08:46:5b:c7:3f:42:08:1b:96:ce:57
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 50:db:65:34:d3:d7:21:78:0d:8d:52:54:aa:0b:45:13:a5:45:55:93
Fingerprint (sha256): bb:a2:82:23:3c:18:a1:55:34:8b:12:3e:42:6d:40:24:f5:3f:2f:e2:d6:3c:04:69:73:25:eb:02:12:a7:38:16

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

Revocation information

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

Check the revocation status for certificate kotubankyousei.biz

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for kotubankyousei.biz

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

kotubankyousei.biz
www.kotubankyousei.biz

Other certificates including the domain name kotubankyousei.biz

(limited to 100 certificates)
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kotubankyousei.biz
mail.kotubankyousei.biz

Certificate

The complete raw certificate details for kotubankyousei.biz in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAttNAXcpK7TsYjbqQiUGQ
IP/JJYQY/fmlydF8zMqlUmlOju8vVZTECRIVK98Pu3xog3KxTM7GMSDweqbmbRam
hcZO3Uque7xBloINJsFnFAdcybiOSUguSWKwHjPxj2l3H9NUpwn/0Oq680ukG+zG
YPhuc2Vm99h1OSAb9gVypMVpkq+UpcdMHxHlOeCFTPCo/k8E36g9i/7eNCHzNhHz
hQGDPzAiJmpzAhLocfRG+vly2H/j4NKJRqYwljs7YtzAVeaBU6RPYm0vtYOc78dB
zksEjt+edt4DSl5mKWO2DTNDwDog0uErXA1EH9bpXPg5plMh0fJ4+xBH1HFDmGc7
PwIDAQAB
-----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 376626095511813127179287562803019233737939
 . . . . . . . . [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 2023-12-07 09:01:01 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-06 09:01:00 +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 'kotubankyousei.biz'
 . . . . . . . . [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 23079543467052629496502956909784780221991269334024354906501666134108882786147700179570431674600616480265534413023640010361203531876110827645390007307825073822006744577868086522620401238107464257502760992487642677468807909147710479313848394601736461028142294116500639289869664438364138072777807095233684517706337193922748544994992858662129969007743892957636369488468767223798925168201952784488499499992790964478642710956536374324046769842641914274090834012778984306517358310117576624265373321054562207226125925319069237602450625226997854939030398460921825176367806844179603147675173107476924283339267446021611342740287
 . . . . . . . . . . . . . . . . . . . . [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)
							34f9331a6773b402c808465bc73f42081b96ce57
 . . . . . . . . . . . . . . . . [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 (46 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'kotubankyousei.biz'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.kotubankyousei.biz'
 . . . . . . . . . . . . . . . . [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 (247 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
							00f20077003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018c43b93b3b0000040300483046022100a95db98e70d28acbc34533acf91bf9b306598ce2d98d38a01bdc7ef22f1c5b71022100e3f0f893907ffdc0d15c6843f52f01e5d1885dabc5bb913b94eac9aa22a8922200770048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c43b93b370000040300483046022100b5cef8e89bc18ea5ed41b76888bca8ace98875be529f5c9572b27ed246f3f8c6022100b7bf55d76714bc9133ac8f3b402763b5a731fc38c13e604a4c70fb3be8b11eef
 . . . . [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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