at-kun.jp

Issued by R3

About this certificate

This digital certificate with serial number 04:a5:20:2e:6f:15:c6:80:3c:f8:cb:dc:75:a6:4c:e0:71:c4 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): 04:a5:20:2e:6f:15:c6:80:3c:f8:cb:dc:75:a6:4c:e0:71:c4
Serial Number (int): 404638510663589133448472218856784075452868
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 69:5a:f4:8f:0e:f1:7a:03:e1:f3:c6:18:40:a1:84:08:3b:f1:d4:27
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 41:18:63:3a:96:63:74:5a:bc:73:9e:de:73:bc:e6:27:d8:56:2a:59
Fingerprint (sha256): ce:55:c9:46:e8:b0:ad:fe:69:a4:32:59:c7:2f:ac:37:07:f3:33:72:ba:e4:b4:b5:6a:ac:72:65:1f:af:9d:3b

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-----
MIIE7zCCA9egAwIBAgISBKUgLm8VxoA8+MvcdaZM4HHEMA0GCSqGSIb3DQEBCwUA
MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD
EwJSMzAeFw0yMzEwMDIwMTI2MDRaFw0yMzEyMzEwMTI2MDNaMBQxEjAQBgNVBAMT
CWF0LWt1bi5qcDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAOizSPWz
iMBOGJ0m5wlktlwMa2ZL+MJa0gOCZB8+t29w69FT9Mb6Y2Y4Tg2ymerz3+rzGTeT
9/3USPdswE0BjMrmp3OjJnDMadcozVcmN4T7I1CB0hfonvizeMa9UsZ4lSrH2lH1
Qkq6xCepdzxVckOAhzSad0BySVa/dWzmRaZqZjnfhm6D/exr2jXvcNLsSo/jcQFF
/nlD2N+EOLUML4YVXeUgEQWlpC3u4g+c1YwGNyGPBLuMR1QBQARt2Dkh+h5OWeZv
sG0F6eEzCFtyQRVYyZVTTYeDwCKm08Cdt1MBWv4hxkF995Ep+uCl5J2WFCNOgxSe
AuOj0WMaaNTkoCsCAwEAAaOCAhswggIXMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUE
FjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQU
aVr0jw7xegPh88YYQKGECDvx1CcwHwYDVR0jBBgwFoAUFC6zF7dYVsuuUAlA5h+v
nYsUwsYwVQYIKwYBBQUHAQEESTBHMCEGCCsGAQUFBzABhhVodHRwOi8vcjMuby5s
ZW5jci5vcmcwIgYIKwYBBQUHMAKGFmh0dHA6Ly9yMy5pLmxlbmNyLm9yZy8wIwYD
VR0RBBwwGoIJYXQta3VuLmpwgg13d3cuYXQta3VuLmpwMBMGA1UdIAQMMAowCAYG
Z4EMAQIBMIIBBQYKKwYBBAHWeQIEAgSB9gSB8wDxAHYAtz77JN+cTbp18jnFulj0
bF38Qs96nzXEnh0JgSXttJkAAAGK7jT9QgAABAMARzBFAiEAk/3i0Rt/kCmf4XOp
glrnlZCoKa6JvAz8K9CJGkvd1LQCIFdoIdLi2DUTjDWw6JoDDytUOlEvWSLzVJQU
KXp5UTLrAHcAejKMVNi3LbYg6jjgUh7phBZwMhOFTTvSK8E6V6NS61IAAAGK7jT9
YAAABAMASDBGAiEAxg4ipd1EPqd4vQBsztMWtofUdKwk3hqn9sJzV58yFC4CIQDs
IPrGjkoI6mfAN8CtwfLV7G6YahZqvF/PekdZ351rpTANBgkqhkiG9w0BAQsFAAOC
AQEAb7YZWfI88hsiAg4/5WO2Vb92gLhYay9uHDBBspLcewqt44CmSbfDoSW7YQ6/
HPLZylt9CSKDTr62vaRFK9/L8MZBECYyPefkIp5x0ewW817cadURD6KBOK4aFYGH
wbI6eIkCoFxGy16N/Bvfwb2wqWYlKwfzH7dXGXUjztw1Y6oJYYJsx8bXUHfgvcBt
/7szMpf7AV0Bjz1LDUgaw6P5+cZAhqud+zrJ+DFaa82zaaRP8OLh/yiDmzSarnXb
QH/MU5Yk6MOpPjeGe7cdDvLT5dAPCftw41Y6XCIfnhlyGU/aE6sVZYYBycpiiRKA
xx9EFbZScrTL1/yKmRvOXxo9wg==
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6LNI9bOIwE4YnSbnCWS2
XAxrZkv4wlrSA4JkHz63b3Dr0VP0xvpjZjhODbKZ6vPf6vMZN5P3/dRI92zATQGM
yuanc6MmcMxp1yjNVyY3hPsjUIHSF+ie+LN4xr1SxniVKsfaUfVCSrrEJ6l3PFVy
Q4CHNJp3QHJJVr91bOZFpmpmOd+GboP97GvaNe9w0uxKj+NxAUX+eUPY34Q4tQwv
hhVd5SARBaWkLe7iD5zVjAY3IY8Eu4xHVAFABG3YOSH6Hk5Z5m+wbQXp4TMIW3JB
FVjJlVNNh4PAIqbTwJ23UwFa/iHGQX33kSn64KXknZYUI06DFJ4C46PRYxpo1OSg
KwIDAQAB
-----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 404638510663589133448472218856784075452868
 . . . . . . . . [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 2023-10-02 01:26:04 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-12-31 01:26:03 +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 '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 29375695480222396198955082624699532441806048986239089527029619826822926465340433348679824522628955297799040977871698182835351946758631707920409680142651142108631980627729541207786402298703180032173491014128316684433997564329927683234503755838738480877364017250550556015290398730039020517786891498646440385751786929020827940418349632003141918797213301749765604243636975647808812909665556382706377774977105809276480183285849694238882289620790062330208213243976007052857103758580912494837688310346517970851540952042904234219089884432477051492538356821813618176100497034021594903212892102210178405932825659641995423162411
 . . . . . . . . . . . . . . . . . . . . [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)
							695af48f0ef17a03e1f3c61840a184083bf1d427
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb4990000018aee34fd42000004030047304502210093fde2d11b7f90299fe173a9825ae79590a829ae89bc0cfc2bd0891a4bddd4b40220576821d2e2d835138c35b0e89a030f2b543a512f5922f3549414297a795132eb0077007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb520000018aee34fd600000040300483046022100c60e22a5dd443ea778bd006cced316b687d474ac24de1aa7f6c273579f32142e022100ec20fac68e4a08ea67c037c0adc1f2d5ec6e986a166abc5fcf7a4759df9d6ba5
 . . . . [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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