masahiro.co.jp

Issued by R3

About this certificate

This digital certificate with serial number 04:ee:c6:ce:27:11:84:b1:01:02:4d:ed:73:73:de:9d:91:47 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=masahiro.co.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:ee:c6:ce:27:11:84:b1:01:02:4d:ed:73:73:de:9d:91:47
Serial Number (int): 429700604602944531719194190512808410321223
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: f5:c7:28:1f:54:48:0e:e8:9b:6c:fb:bd:d9:d2:c1:98:25:aa:46:cb
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 47:47:39:ca:03:20:8a:fd:86:42:a1:76:c7:ea:bd:92:49:e0:86:21
Fingerprint (sha256): ac:24:61:2e:68:4e:24:22:0e:5a:24:c3:fb:e4:c4:a0:3b:80:20:a3:f4:8b:d2:58:d7:aa:ab:71:01:cf:78:00

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

Revocation information

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

Check the revocation status for certificate masahiro.co.jp

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for masahiro.co.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

masahiro.co.jp
www.masahiro.co.jp

Other certificates including the domain name masahiro.co.jp

(limited to 100 certificates)
www.masahiro.co.jp
www.masahiro.co.jp
www.masahiro.co.jp
www.masahiro.co.jp
www.masahiro.co.jp
www.masahiro.co.jp
www.masahiro.co.jp
www.masahiro.co.jp
masahiro.co.jp
masahiro.co.jp
www.masahiro.co.jp
www.masahiro.co.jp
masahiro.co.jp
www.masahiro.co.jp
masahiro.co.jp
www.masahiro.co.jp
www.masahiro.co.jp

Certificate

The complete raw certificate details for masahiro.co.jp in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAqg6AP/yXKtso7FMJ6n9+
jBlUmWtG+HVKSfU3YaiJHSXtVgIPQr4qbvoy3RT8Oy+xkra1Td8WcNAJHGqbQw0y
WAPopCSfYQ0F3cTXAK50KvGpQpGPdsV45Y1Gm8GabbcE3t2AjlSHUfPpKu3P2/4+
wSkk1P5savcB4/9/gsNhcUWeIg2PEvZWL8i4zq5qXyQlXCygZnnSYaaz0n1o0Mqf
71vjlh3p+2KKVSap1RvS7u9nnbZUMI53fmrsRzFIpZOPnvs48uMPpa/1E7DtIGn1
bLMTU0cNww+TZ6+Ovbtk+hyhyA91Mj28GmrVTf5ntoJylay+PIPEBjevk8Lp/Y70
eQIDAQAB
-----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 429700604602944531719194190512808410321223
 . . . . . . . . [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 2023-12-20 20:04:05 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-03-19 20:04:04 +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 'masahiro.co.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 21467662542182888131711351410247680181203141064252305855079454912360939815318744469852230731973942086229624303114560270678146737822046688712911124580303531751191029696169080291018003418823552368979112273616817921244383573536946369728155638021649982839777918046990618679182679211420788221840818747164870972410204736464148941547912237653445870063180212010635103983120829231822129191779181286841193457941365260855799027213841611874692044944690036983317638365876919996778045547284975742359711682626721470556103235693779538991364948830754517227237617724226465229022799180940836615351254550313722919604611906136328887006329
 . . . . . . . . . . . . . . . . . . . . [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)
							f5c7281f54480ee89b6cfbbdd9d2c19825aa46cb
 . . . . . . . . . . . . . . . . [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 (38 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'masahiro.co.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.masahiro.co.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 (243 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes)
							00ee00750048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c890af4b7000004030046304402200ebf1c91baf92880b5be37a4df2caf424b0fdfdd98683f94f04576f9116d5c54022031d1f68b21cf281edf3b38b18151058cdeb3461ba5fde5fdd4bd20b9977d7eac00750029d03a1bb674aa711cd3035b6557c14f8aa78b4fe8389449eca453f944bd24680000018c890af5b20000040300463044022057cd4e959e4bcb0f180cac5cfbe5e49cd71c0b48a9d3e3d93341e18966d83d1f022050d4a1b20e9ec120d416d21abf07152bf1fb0ae450640a036405ea4f9652dbdc
 . . . . [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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