at-kun.jp

Issued by R3

About this certificate

This digital certificate with serial number 03:a6:b5:ee:b5:c7:49:cc:84:e3:55:c7:78:c0:28:f1:d4:42 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=at-kun.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:a6:b5:ee:b5:c7:49:cc:84:e3:55:c7:78:c0:28:f1:d4:42
Serial Number (int): 318065560424951308192184139852550425924674
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 9b:1a:7f:b9:42:06:3a:5b:37:0e:64:07:6a:1e:57:5b:f1:44:1a:7b
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 12:b2:05:8b:7a:cb:b5:02:a9:5d:24:81:5b:71:c3:9d:f7:46:57:4e
Fingerprint (sha256): 81:fc:d9:a2:52:25:b2:08:94:e8:20:4b:50:77:53:e6:90:c2:17:64:1a:b3:16:28:c1:b2:9b:36:31:fb:40:de

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

Revocation information

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

Check the revocation status for certificate at-kun.jp

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for at-kun.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

at-kun.jp
www.at-kun.jp

Other certificates including the domain name at-kun.jp

(limited to 100 certificates)
www.at-kun.jp
at-kun.jp
www.at-kun.jp
www.at-kun.jp
at-kun.jp
www.at-kun.jp
www.at-kun.jp
www.at-kun.jp
at-kun.jp
at-kun.jp
www.at-kun.jp
www.at-kun.jp
at-kun.jp
www.at-kun.jp
www.at-kun.jp
www.at-kun.jp
www.at-kun.jp
www.at-kun.jp

Certificate

The complete raw certificate details for at-kun.jp in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvSKf2e31e2iTK6Ygm2kf
19sz1dHqJKFU3OtnMRhL+s0IgKS83Rw5qiEWqeX/AIFfQQMjdcNGqfECTb0XgynR
Bd3DrUSpF/TuYvZa17LF4WYZc+nYze/ePHXkongwRVPrwIM+VgHHoBITmY0WXXJ8
tg6spM144nM3ro+p/B1Rm6WMIRuhkHsDZoeQ7l5jxKMKt++0HvGqrqhXbpZkxZqA
OtNWFHA3rNcFubb7H/qZN260jdNGdWlBFMLkXCFFPBS6IGUCdAbQ8bcuXEFxNyvc
l1Qi9aNZCWfdt8wnrmnRXP1l8i3rALm1wj6bHz/s/JseOrmrWrfLCBll7qbKwiNd
9QIDAQAB
-----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 318065560424951308192184139852550425924674
 . . . . . . . . [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 2023-12-01 05:18:48 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-02-29 05:18:47 +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 'at-kun.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 23876113575993057257334174068696451085891413709138539185124460058901556247173472181236007055360234014579310183016459335873176968616404975656843576625197564533007965327567434428829934205242132085133711696811027245193569203099788542947127372786474080863572716766590024724170212340193524905303856604340779747512370062043841754285714579103131225721557081199996861479877414251201900793583087814488700053167798267250451834683474391601587723309892717935141773847463069838518725133693594648889599759595803879291068095152114671131751177710807037972350784913008106866191512366246894867287583292764110858821710496157840066174453
 . . . . . . . . . . . . . . . . . . . . [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)
							9b1a7fb942063a5b370e64076a1e575bf1441a7b
 . . . . . . . . . . . . . . . . [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 (28 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'at-kun.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.at-kun.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)
							00f000770048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018c24079e38000004030048304602210087aa0392c44d6cc431c2263960dea218229e6331b9e5c0f6a9d877d5761cbd6e02210086542ba0df9dd80f9200f9a684ff3a0c1ffc454c5cc1440e2b613e6bb3ee556b007500eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018c24079e37000004030046304402200aa2cad723de01d713afdfbc946eb9072c7f42a6c70ccb336775887abd33666a022040d8a1ee20bed17aaa711e047fd623a168443091aa86083597ff68c5457fc30e
 . . . . [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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