hbktk.tokyo-u.org

Issued by R3

About this certificate

This digital certificate with serial number 03:5c:be:35:ef:41:21:ef:4b:77:c0:68:d0:e5:d9:89:68:f1 was issued on by Let's Encrypt.

With 6 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=hbktk.tokyo-u.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:5c:be:35:ef:41:21:ef:4b:77:c0:68:d0:e5:d9:89:68:f1
Serial Number (int): 292895668915595943071376116720826766158065
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: ea:b1:9b:92:57:01:ee:b0:57:70:eb:f5:18:66:84:af:9c:2c:48:04
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 54:ef:67:72:1d:e8:d9:f2:23:36:d6:88:69:5a:b2:b8:45:99:98:d1
Fingerprint (sha256): 95:69:f2:55:ca:94:47:e8:b1:bc:ed:ec:67:54:39:84:92:32:a3:05:6d:0f:7e:00:56:63:5b:ab:eb:79:4d:fd

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

Revocation information

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

Check the revocation status for certificate hbktk.tokyo-u.org

6

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for hbktk.tokyo-u.org

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

hbktk.tokyo-u.org
jit.tokyo-u.org
jop.tokyo-u.org
kinten.net
nct.tokyo-u.org
note.tokyo-u.org

Other certificates including the domain name tokyo-u.org

(limited to 100 certificates)
mail.kinten.net
mail.kinten.net
kinten.net
mail.kinten.net
kinten.net
hbktk.tokyo-u.org
mail.kinten.net
mail.kinten.net

Certificate

The complete raw certificate details for hbktk.tokyo-u.org in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxKDiwaQSySt190G/lZOT
Vmvz66pmRI1/l0enyZhBeAP5OGfyX0f9zIa/Nag7OZdxHqEgwpzcN14ubeZdEuNw
CBrCa9K37xKAs6IX5UAFzXkUpr1eQIFihjIh2prn0xxV211ou2k9kn9SNrfq/+4X
irHdbNWbKr95SKkv0h2eL52RJRM12mKB0pF+4Tt1MCZta50TzUnH0tpfRVFHZJaX
2GKhXIICLHGW+XENJMEgo00jp8IzQr327asRajweGhFP1g+v7G1IvptzxhToV5SU
0FR0/+4IIj/4ynYEFJjrOfc2prrsSxx3cfIw7qrnZ0Oeb9jX+PfwT7RAhiXC1AS9
hQIDAQAB
-----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 292895668915595943071376116720826766158065
 . . . . . . . . [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 2023-10-08 11:06:20 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-06 11:06:19 +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 'hbktk.tokyo-u.org'
 . . . . . . . . [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 24822043502049646137633450323431655623726183390526752831638745463159967565252920096701664884706770088301487978317879441232343232311885704276891775947322620214407783255730498938168475235850352693025603494821316720458102775694062998726793839517729183257792000051244877935582382513738897982870755183165307611293537368094461902110110051252366210884539455819107264106697256192401100390331596347765385367180919528919226737855789492346569229791718689556587115086031244212954901658977539504877251861840857959623603039976277472783193071682871676543479058117319344216601578280125368314546801926721446722372544934161782573153669
 . . . . . . . . . . . . . . . . . . . . [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)
							eab19b925701eeb05770ebf5186684af9c2c4804
 . . . . . . . . . . . . . . . . [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 (102 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'hbktk.tokyo-u.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'jit.tokyo-u.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'jop.tokyo-u.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'kinten.net'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'nct.tokyo-u.org'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'note.tokyo-u.org'
 . . . . . . . . . . . . . . . . [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)
							00f2007700dab6bf6b3fb5b6229f9bc2bb5c6be87091716cbb51848534bda43d3048d7fbab0000018b0f2e664e000004030048304602210090f07609b2fba1f997871eacf22fd8216d17d0221202de141e074fbcf89173fa022100c76ede5a1bf76491bd7c770940c98514655136d89fe214381aa7f373be9ea610007700eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018b0f2e66da0000040300483046022100addadde31f460619417da31946c09e657f009e1d7c8b4c81a8631a116a5f1bc4022100b603efabf0e6755b380ac5c6049b95a6d2c0ee761ddd2b8ca074d9e11f78cec8
 . . . . [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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