DV SSL/TLS Certificate for www.keiainet.co.jp

Certificate is witin its validity period

Issued by Let's Encrypt (R10)

About the www.keiainet.co.jp DV SSL/TLS Certificate

This certificate with serial number 05:93:20:8f:30:0a:aa:8c:a8:a8:7f:4d:33:91:65:39:12:24 for www.keiainet.co.jp was issued on by Let's Encrypt.

With 2 subject alternative names, this certificate can be used to secure multiple FQDNs. This DV SSL/TLS Certificate is currently within its validity period but we haven't checked the revocation status of this certificate, you can do this simply on revocationcheck.com. We have found some issues with the compliance of this certificate, they are be shown below. We hope this DV SSL/TLS Certificate review for www.keiainet.co.jp provides you with the detailed information you were looking for.


We have identified some issues with this certificate:
  • 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)

Let's Encrypt

Organization: Let's Encrypt
Country: US

This X.509 certificate will expire on

Certificate Details

Serial Number (hex): 05:93:20:8f:30:0a:aa:8c:a8:a8:7f:4d:33:91:65:39:12:24
Serial Number (int): 485626216364895800248692360098407645778468
Serial Number Length: 139 bits, 18 octets

Subject Key Identifier: cb:0a:42:11:33:a8:90:ab:41:07:b2:95:bf:0c:ae:74:ac:3a:e5:00
Authority Key Identifier: bb:bc:c3:47:a5:e4:bc:a9:c6:c3:a4:72:0c:10:8d:a2:35:e1:c8:e8

Fingerprint (SHA-1): 39:8f:3f:63:85:7b:0e:53:c0:b7:93:bc:2f:9a:46:e4:e1:65:2e:de
Fingerprint (SHA-256): 59:69:f5:5c:15:91:2c:57:70:5e:84:34:0a:49:64:cb:c9:54:85:a5:1a:5a:54:ec:eb:09:de:8e:cb:b8:a7:66

Issuing Certificate URL: http://r10.i.lencr.org/

Revocation Information

CRL Distribution Point: http://r10.c.lencr.org/37.crl

Check the revocation status for certificate www.keiainet.co.jp
2
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details of the X.509 certificate for www.keiainet.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
10
CA Certificate
This is not a CA certificate

Subject Alternative Names

X.509 Certificate

The complete raw X.509 certificate details for www.keiainet.co.jp in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAu/Sf++zUeIRgWS5+iFs3
aJKxLkdz51+qCT3GdraOAG9mBfgN+XbYSVczacD2RyL83qXVAWLgAmMeHbZ6sKCb
Rg+n8Wn/CRw1LnxokwJsDEem3HRRPnWHL760bjI0CDWgp/MIMZvtRRkZKK83n58X
uGs91cum7wMpy1WUbjv7jlYq8aUWyeq9ZNSdaxQjA/LYLZiJpBEbx2+tSTZhZEUx
Atjl4BAb62RqSm82RYQNWDcrMWg+cAivfkp3K+n+n3K058Tuw4fqVFMszGOryB9h
eCnFjhG2jQbaxX7RNaiuttZ8FI0ofkiTvI5RCD0Ds5V2nBNcgvWuKZoiVgN2RIP7
OwIDAQAB
-----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 485626216364895800248692360098407645778468
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'R10'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-05-28 00:04:43 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2025-08-26 00:04:42 +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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'www.keiainet.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
 . . . . . . . . . . . . . . . . [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 23727192081399464737201506777879253982770115163885833520942755225877077830864460392424061012634614988338117425727580057505325048554984969794274456412011610164482526983786900619051774142874532570635758523380670272118303874808044522740997119054919250660170797498013034083183767651917849470883180923931049172967376265389320778480744479454458163372264957459477251969275847874797007471122009130496434707485861877574815102549640378236285501647414393837132268987634248157423854307112276542613638298912833313768587557255447843492557008043170802531700051070737140556300976654352726033807192049805962214701659578708850324536123
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.3.2
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (22 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (20 bytes)
							cb0a421133a890ab4107b295bf0cae74ac3ae500
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.35
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName bbbcc347a5e4bca9c6c3a4720c108da235e1c8e8
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.1.1
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r10.i.lencr.org/'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.17
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (38 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'keiainet.co.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.keiainet.co.jp'
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.32
 . . . . . . . . . . . . . . . . . . . . [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
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.31
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (39 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://r10.c.lencr.org/37.crl'
 . . . . . . . . . . . . . . . . [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)
							00f0007500dddcca3495d7e11605e79532fac79ff83d1c50dfdb003a1412760a2cacbbc82a00000197146a3442000004030046304402205ebf0ffcead9ca35bc0808741922ea5b9c7ccca52eacf38f062e7e015e02684102201bd40ffb89cef7d9a7fd3532d3d8528f3644fadc156c85bb292e0b38513767500077000de1f2302bd30dc140621209ea552efc47747cb1d7e930ef0e421eb47e4eaa3400000197146a43a00000040300483046022100ae2ffd0ab3fe63196c6d944e3b97983fa2dbf8689f88ea9ba18a568c211248de0221009b1c3a3e6d86433b1438b78ff4423a34cde579d5a7b590d51f2f52ad8fedeb43
 . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.11
 . . . . . . . . [c:0|t:5|false] NULL []
 . . . . [c:0|t:3|false] BIT STRING (2048 bits)
		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