masahiro.co.jp

Issued by R3

About this certificate

This digital certificate with serial number 04:63:70:97:86:8f:9f:fa:c1:de:32:8f:4c:c3:e6:75:a9:3a 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): 04:63:70:97:86:8f:9f:fa:c1:de:32:8f:4c:c3:e6:75:a9:3a
Serial Number (int): 382286758353789469198502504842835067775290
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: ff:21:67:fd:b9:48:80:d7:75:6a:f2:ad:4c:d6:62:e3:55:80:29:45
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 12:ab:22:96:7d:af:8f:46:88:80:07:4f:0e:a8:31:6f:29:36:3c:93
Fingerprint (sha256): cf:20:bc:e2:63:c6:d9:d4:37:ee:74:5e:6e:b0:03:3a:29:6d:e2:bc:c4:20:31:7f:55:c2:b1:ec:c9:be:10:d4

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-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwLEUcaFMVgr9hwNSxqGx
DrwSqnO6mYaiRRS2S1NAGg6mynKY6HK5QasnZi7BP01iI2BxpRTgVkb72C0bkNFq
4GG+KBuNipFwFRdiIIA6LyEW0OKnMhAr73aUhQ90KvNvjL2Q6ukSujR9HL5XcsfA
TPrSIpYl6vdPIDVfoauQeyVB++YEYJ12wIP3fgTD7qeHATDV3G9YcuIeusAUUmmA
5yhhgkwxN7gCG3M51A9avpgWt1lCHGU8sbUqJsJGOcUx2QipT6ESL1MbvQwR72w6
+KrjfRnOKGsHsrRt43lTClpJNryDdgOJa206afgDVqEqzOMVeUNR6JqnlcqTMZ8f
PQIDAQAB
-----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 382286758353789469198502504842835067775290
 . . . . . . . . [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 2023-10-12 03:04:04 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-01-10 03:04:03 +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 24325075886396429667806835105344409643472418681089230982500906578078200028870756263974275421918651000705704211973853271815637813532328635869260307509721514843833417775837324467204185358296261494519468765342625398972800480576827748322928066610450267996686591485612158610537254978601454912336365225827190038220947931930873288412073672595623755592753536121541658827543201602885504472277889411779310724965737244787771299899602008180537016547560047269268911084308578228338195549353290438543071846514462708494166907591757138963410998571169297875633616840724807956051952552992091237485768309969522574775810447325174461046589
 . . . . . . . . . . . . . . . . . . . . [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)
							ff2167fdb94880d7756af2ad4cd662e355802945
 . . . . . . . . . . . . . . . . [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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f00076003b5377753e2db9804e8b305b06fe403b67d84fc3f4c7bd000d2d726fe1fad4170000018b220e4e6c0000040300473045022100aa53a4989133aa8af03d355a6272da6e80ed5dfcaf15572fab7a0677da6ee9ab02203835cd131dea1da163f7c33d33e659b7e9d3e0d29526fe250f8f94a38b7ace1900760076ff883f0ab6fb9551c261ccf587ba34b4a4cdbb29dc68420a9fe6674c5a3a740000018b220e4ed40000040300473045022037182d56b8ac4f48cfdc3c236e553344f1f7e091fdeeae66701cc55d981378b6022100ece0330614c18a164e7cffa5b5023de72afb2ce88b12ec1f89b348b251b4a9ee
 . . . . [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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