www.rkobo.jp

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:23:1b:8b:47:e0:b9:4d:5f:7b:5c:12:63:f3:9c:e6:bc:93 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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

CN=www.rkobo.jp

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:23:1b:8b:47:e0:b9:4d:5f:7b:5c:12:63:f3:9c:e6:bc:93
Serial Number (int): 273283352980518653758167849051478028631187
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 1b:aa:c5:7b:40:63:40:00:14:8c:14:76:43:90:1d:44:b4:ab:89:ef
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 98:b9:61:ac:02:b0:6a:26:51:80:6a:60:be:38:46:92:29:dd:9e:7d
Fingerprint (sha256): 21:88:69:09:ff:ca:39:83:83:d9:3d:a3:e9:23:1a:b9:8c:2d:1a:9d:12:fe:95:1b:b6:ef:d6:8a:25:33:db:0a

Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/

Revocation information

OCSP Server: http://ocsp.int-x3.letsencrypt.org

Check the revocation status for certificate www.rkobo.jp

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.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

www.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 www.rkobo.jp in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA8Ad3it/jKKAKChz8fbhZ
HCxCF7BM+4LcFmWqqOcMqeqQOS42WsbBrs7AeveBXra7GiApb2ZA+rH/PTJlOjNd
MpssdJo2teQgLXnKpjTVp/0kKWW/SQEQMsOYVLryUUvSjwtJ0nzu0LBCX0lKmxaj
5p50cCcMDZC2hANtMwh9X+vQ1blgDMEU4C+rdHm0C9uW39aGVI0AbpelMSXdaIOg
0yKm+zWBjbHaeNPZdlcjqXNRJi/UrRhKMo0m+MxlG8k2QsY3QHvOWrqhVkXIGSji
y3WeWw+Yj4J1WXVXIWmc2dM1rkvBnlL7FTdJ5+seDgfyp7x5lbVB757agpaB915l
kQIDAQAB
-----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 273283352980518653758167849051478028631187
 . . . . . . . . [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 'Let's Encrypt Authority X3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-05-30 09:14:13 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-08-28 09:14:13 +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 'www.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 30300875288448124169098281473430018750301872873015543271613148788238322152244463676946826512053159328042422657075984834655898986804461732631840075750165042821708103882902697826656776675956003471635645518968746705896548737885606485052168369088785060489279246637489665278021617206987527914530122138459565253369337194240822910140303137812204123972868709387701644721564670258797882335363124098553715954110131970259854565972561682121004853538238876939626833334007985878212677162994320099773523951548151606185184766190772385794362672133286604706592424360442072702078059815398488198600719321740682709195063944735125007132049
 . . . . . . . . . . . . . . . . . . . . [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)
							1baac57b40634000148c147643901d44b4ab89ef
 . . . . . . . . . . . . . . . . [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 a84a6a63047dddbae6d139b7a64565eff3a8eca1
 . . . . . . . . . . . . . . . . [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 (99 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://ocsp.int-x3.letsencrypt.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://cert.int-x3.letsencrypt.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 (16 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.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 (69 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 1.3.6.1.4.1.44947.1.1.1
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.2.1 (cps)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:22|false] IA5String 'http://cps.letsencrypt.org'
 . . . . . . . . . . . . . . . . [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)
							00f1007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016b083ba2920000040300473045022100c3e7eea8759c4ae59e379942de71a326f191e4451c62c9efc5e23190c7b5ec65022020cc99f855f74d47b67d7c10112e2dcf1e078b1da808f04c72009721c25adced007700293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016b083ba0ba0000040300483046022100801a846b26f60ab40d1b6dcfa76ec5640ba1a4a180a7b17c87c02f288b98d92e0221009e3856cb12d3ddf6b65c92a848333b6b2c01a423f6bb6dbd82867cdc91c3da32
 . . . . [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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