rkobo.jp

Issued by R3

About this certificate

This digital certificate with serial number 04:80:ac:f7:26:fa:94:4a:d5:da:9f:af:fa:16:91:f9:7d:00 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): 04:80:ac:f7:26:fa:94:4a:d5:da:9f:af:fa:16:91:f9:7d:00
Serial Number (int): 392235197196104673361561978419321161481472
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 47:98:e8:a6:53:18:01:0e:5e:33:69:19:3b:91:42:2d:8d:77:5a:02
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 63:19:9b:ae:3e:2a:d1:36:c8:9e:76:0c:6b:22:9d:af:e0:b9:64:9b
Fingerprint (sha256): 8e:8f:2c:a0:7c:a6:5e:fc:df:bd:2a:bf:8c:b4:c8:0b:5a:c5:ba:b7:f0:1c:d1:13:b1:4d:b5:4e:bd:19:1d:51

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
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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-----
MIIE3TCCA8WgAwIBAgISBICs9yb6lErV2p+v+haR+X0AMA0GCSqGSIb3DQEBCwUA
MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD
EwJSMzAeFw0yNDAxMTUwODE0MzJaFw0yNDA0MTQwODE0MzFaMBMxETAPBgNVBAMT
CHJrb2JvLmpwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyDfnHw1V
GrVVc1s1fvnPu/Zss2yaT1NhRyjGil6r/Cqsr+gBOufInrxvk1h51jnvFuGzJ+NE
mKSskdGFcBa3gbm3Fh1K2PYXP0++zjTBj3lxzFlQi1tRfl4lhoblyyqF4PvdACeP
sJiVZAvvLECvHJoYt5xcGx87cccEP0RlC1qfFb4ooikjhcOrp9pbiFqKS1oANXRB
dA9vO+HIuCJfxB4ugHORJldrUBAmeUpM+Vbr7unsw3bz1Bdg+oiyTicdNMpKwdV2
oE2pps1Kq2dXsgIqTbAi9b1d7T4XdVV1n4cQ07Hv6kcakvjhKFFIpUn3+j9RYKxd
iAT5rT2JB3manwIDAQABo4ICCjCCAgYwDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQW
MBQGCCsGAQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBRH
mOimUxgBDl4zaRk7kUItjXdaAjAfBgNVHSMEGDAWgBQULrMXt1hWy65QCUDmH6+d
ixTCxjBVBggrBgEFBQcBAQRJMEcwIQYIKwYBBQUHMAGGFWh0dHA6Ly9yMy5vLmxl
bmNyLm9yZzAiBggrBgEFBQcwAoYWaHR0cDovL3IzLmkubGVuY3Iub3JnLzATBgNV
HREEDDAKgghya29iby5qcDATBgNVHSAEDDAKMAgGBmeBDAECATCCAQQGCisGAQQB
1nkCBAIEgfUEgfIA8AB2AEiw42vapkc0D+VqAvqdMOscUgHLVt0sgdm7v6s52IRz
AAABjQxmsSMAAAQDAEcwRQIhAKMS2yxydklF7tQ+pEHxbIxMugRhQopvBJxBFPdz
GB/jAiBySUVHXKIrgKyp+exgyorM+6SXKnAgPqLnKmiKofME0QB2AKLiv9Ye3i8v
B6DWTm03p9xlQ7DGtS6i2reK+Jpt9RfYAAABjQxmsTEAAAQDAEcwRQIgRPI11r4i
0AQlN3kTJKnYn93E4dRDxeSK/ezSDq2yjLACIQCw2i3xmH+pSG/AIirRNmeASR+9
kPClhGXEIIqGrep1WTANBgkqhkiG9w0BAQsFAAOCAQEAfdmbjZ8+CTUg48CUb2Eo
38tOYrCx6ou+qTxg2bp9+Jgfr+JzCNCnnYowpx0g0dPtZSVNbNDPV0Gv1U859mAM
Y26aQGBVXECVeGjQ+Ulz5YWFDP4OfbEDzlI3cSJ9Bf7/VIpcke3haJakB+ahNZan
RWiMWNtTHNAyt8qlSBABBm+suc+6SD3BGIv1EFCjcRhlDomepPYiqd46vIMdaGAT
GcReoAWQREDOmjQXnJq5C9nv2LebdoKjTGhHg+N+0TXwTkyS8pFVryu94TyrEn4u
qDz2P0h99KqzTf1iX/+uSQkyMIEirfW5yUduU2bsAh8jU/FtndWWPlMSgm9vNVQN
2g==
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyDfnHw1VGrVVc1s1fvnP
u/Zss2yaT1NhRyjGil6r/Cqsr+gBOufInrxvk1h51jnvFuGzJ+NEmKSskdGFcBa3
gbm3Fh1K2PYXP0++zjTBj3lxzFlQi1tRfl4lhoblyyqF4PvdACePsJiVZAvvLECv
HJoYt5xcGx87cccEP0RlC1qfFb4ooikjhcOrp9pbiFqKS1oANXRBdA9vO+HIuCJf
xB4ugHORJldrUBAmeUpM+Vbr7unsw3bz1Bdg+oiyTicdNMpKwdV2oE2pps1Kq2dX
sgIqTbAi9b1d7T4XdVV1n4cQ07Hv6kcakvjhKFFIpUn3+j9RYKxdiAT5rT2JB3ma
nwIDAQAB
-----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 392235197196104673361561978419321161481472
 . . . . . . . . [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 2024-01-15 08:14:32 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-14 08:14:31 +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 25275227699979310707145892727913711440733771724272978197653418865901807717917140004191195939917466565138030200058616707959721497504152228846773260190676521192700781914198341326900300096592422629554804897808212368889413614670905301143269038187413665270713736406501853055615328892894805639068852388147258500071725601198150868335797172523863632769411946342044378505362887810610982906542468870705370990359148108854813034572713405334252193705024791350553652692884653686196886372620421410730424932489687570179603434333757825999716208912527116233437308936377310704109198196409577791127382953205521222306455197401375812721311
 . . . . . . . . . . . . . . . . . . . . [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)
							4798e8a65318010e5e3369193b91422d8d775a02
 . . . . . . . . . . . . . . . . [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)
							00f000760048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018d0c66b1230000040300473045022100a312db2c72764945eed43ea441f16c8c4cba0461428a6f049c4114f773181fe30220724945475ca22b80aca9f9ec60ca8accfba4972a70203ea2e72a688aa1f304d1007600a2e2bfd61ede2f2f07a0d64e6d37a7dc6543b0c6b52ea2dab78af89a6df517d80000018d0c66b1310000040300473045022044f235d6be22d0042537791324a9d89fddc4e1d443c5e48afdecd20eadb28cb0022100b0da2df1987fa9486fc0222ad1366780491fbd90f0a58465c4208a86adea7559
 . . . . [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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