rkobo.jp

Issued by R3

About this certificate

This digital certificate with serial number 04:56:a9:10:06:57:34:5a:06:c0:fe:3a:9c:0e:d3:7c:10:44 was issued on by Let's Encrypt.

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=rkobo.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:56:a9:10:06:57:34:5a:06:c0:fe:3a:9c:0e:d3:7c:10:44
Serial Number (int): 377938150018882591600488402190304483741764
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 7c:cb:dd:aa:e2:cf:da:12:03:c4:cc:42:93:cc:19:f2:f4:b6:fd:0f
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): b5:20:4e:9e:76:57:59:37:26:86:90:6e:e8:e2:22:ef:28:3d:bb:dc
Fingerprint (sha256): 4e:70:7d:f6:ee:70:25:d4:fd:33:36:f6:37:70:20:e4:95:67:f6:c7:bd:e1:a6:0f:fa:c5:2f:b2:39:d7:e8:3c

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

Revocation information

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

Check the revocation status for certificate rkobo.jp

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for rkobo.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

rkobo.jp

Other certificates including the domain name rkobo.jp

(limited to 100 certificates)
www.rkobo.jp
rkobo.jp
www.rkobo.jp
rkobo.jp
rkobo.jp
rkobo.jp
www.rkobo.jp
www.rkobo.jp
rkobo.jp
www.rkobo.jp
rkobo.jp
rkobo.jp
rkobo.jp
www.rkobo.jp
rkobo.jp
rkobo.jp
rkobo.jp
www.rkobo.jp
www.rkobo.jp
www.rkobo.jp
rkobo.jp
www.rkobo.jp
rkobo.jp
www.rkobo.jp
rkobo.jp
rkobo.jp
www.rkobo.jp
www.rkobo.jp
www.rkobo.jp
www.rkobo.jp
www.rkobo.jp
rkobo.jp
rkobo.jp
www.rkobo.jp
rkobo.jp
www.rkobo.jp
rkobo.jp
rkobo.jp
securetest.rkobo.jp
rkobo.jp

Certificate

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

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtXuD9pdA2UzILEHOkYJU
OFynt1VFxklcKtJY2yVOB5BPrUKpgM7c75ox9EMKdU3Me/onRe16I5pXQjQik5ym
+C+ueWi+tZq8QOOByZQDIr8VUTfKLeRuQvaOrszPb/U7kR14QKy7NZLVSBm2eKub
Oc4TJfTRguNc9sy0+3LmYClGV1Em+x1GYZ2u2pcTOFxmNDBYHITN2KDrcsePrPwJ
kB/0W8KLwnoDQZ08wMhqektFUwz7omSXyxUMJb2bngRmMDCsgv/Z0yvzXX8z4oKT
aXhME3/2aqOqEJEHvnjZ6zsJWBQfHezJd8+0RaQV7d7oKoEBOe8YxK+TrbO3syv+
+wIDAQAB
-----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 377938150018882591600488402190304483741764
 . . . . . . . . [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 2023-09-17 15:25:10 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-12-16 15:25:09 +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 'rkobo.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 22910040952811593044176404962699847220162123120070515804668511774970294519538641923487011611738462721575474710755094229561828354352611868086481416675192909834206361755838441260886665913067240524414202642581875899405375185212351726405510430826428995742030580965519198867094293598064500923835591907466231843414909307612839022274009892463740532885792636690265428718096964426456279672484273646195312789353585506809814345424982885964199559907985473386309375442826710519540026132206022742388546293723197612993227620566610472630036010864882323104771049116351237735437924138771271876067689634257303280618058833525314201321211
 . . . . . . . . . . . . . . . . . . . . [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)
							7ccbddaae2cfda1203c4cc4293cc19f2f4b6fd0f
 . . . . . . . . . . . . . . . . [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 (12 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'rkobo.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)
							00f0007700b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb4990000018aa3f5d1200000040300483046022100e5defdda936904bc7579da99fe54033eb67f9ed451453210d5e999320fe0156802210085757a3e5f55c739a63838d8837f4d26f0cd9758c391a723b1b6d8848ecc725c0075007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb520000018aa3f5d1f80000040300463044022064ea8534e58f7a096aade696037b402f177db7a2aae80bbf53a22d8b7141b4b202204d46a123f923aadb8a8fda6ca4f87475f64be3544db2d0dfa9d1da16e245f62c
 . . . . [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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