www.livable.co.jp

Issued by VeriSign Class 3 International Server CA - G3

About this certificate


This digital certificate with serial number 36:16:9c:44:09:d1:6b:cd:0a:7d:45:d5:9d:7a:f6:cf was issued on by VeriSign, Inc. .

While the 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.

Cerificate errors/warnings *beta

  • WARNING: Using depricated TeletexString for '[Shibuya-Ku]'
  • WARNING: Using depricated TeletexString for '[TOKYU LIVABLE.INC.]'
  • WARNING: Using depricated TeletexString for '[Information Technology Dept.]'
  • WARNING: Using depricated TeletexString for '[www.livable.co.jp]'
  • ERROR: Certificate contains a key usage different from ServerAuth, ClientAuth or ServerGatedCrypto

TOKYU LIVABLE.INC.

Organization: TOKYU LIVABLE.INC.
Organization unit: Information Technology Dept.
State / Province: Tokyo
Locality: Shibuya-Ku
Country: JP

VeriSign, Inc.

Organization: VeriSign, Inc.
Organization unit: VeriSign Trust Network
Organization unit: Terms of use at https://www.verisign.com/rpa (c)10
State / Province: Tokyo
Locality: Shibuya-Ku
Country: JP

Time since certificate expired

This certificate has expire since

Certificate Details

Serial Number (hex): 36:16:9c:44:09:d1:6b:cd:0a:7d:45:d5:9d:7a:f6:cf
Serial Number (int): 71895711749724983635437946681343801039
Serial Number lenght: 126 bits, 16 octets

SubjectKeyId:
AuthorityKeyId: d7:9b:7c:d8:22:a0:15:f7:dd:ad:5f:ce:29:9b:58:c3:bc:46:00:b5

Fingerprint (sha1): 76:36:bf:33:1c:9e:89:71:67:24:25:4a:b6:d4:df:eb:f2:a5:c3:6c
Fingerprint (sha256): 13:df:5b:9f:be:d8:34:4c:55:2b:91:e8:83:75:06:2d:21:9b:35:c3:69:36:9c:1a:4d:c6:1c:d1:b2:80:15:c2

Issuing Certificate URL: http://SVRIntl-G3-aia.verisign.com/SVRIntlG3.cer

Revocation information

OCSP Server: http://ocsp.verisign.com
CRL Distribution Point: http://SVRIntl-G3-crl.verisign.com/SVRIntlG3.crl

Check the revocation status for the current certificate on www.livable.co.jp
1
DNS Names
0
Email Addresses
0
IP Addresses

Advanced Certificate Properties

Technical details about this certificate


Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA1 with RSA



Key Usage

Digital Signature
Key Encipherment

Extended Key Usages

Netscape Server-Gated Cryptography
Server Authentication
Client Authentication

Extensions

8 extensions
No unhandled critical extensions



CA Certificate

This is not a CA certificate

Subject Alternative Names

This certificate doesn't contain any other subject alternative names besides the common name of the subject: www.livable.co.jp

Certificate

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

Certificate (PEM)

-----BEGIN CERTIFICATE----- MIIFYDCCBEigAwIBAgIQNhacRAnRa80KfUXVnXr2zzANBgkqhkiG9w0BAQUFADCB vDELMAkGA1UEBhMCVVMxFzAVBgNVBAoTDlZlcmlTaWduLCBJbmMuMR8wHQYDVQQL ExZWZXJpU2lnbiBUcnVzdCBOZXR3b3JrMTswOQYDVQQLEzJUZXJtcyBvZiB1c2Ug YXQgaHR0cHM6Ly93d3cudmVyaXNpZ24uY29tL3JwYSAoYykxMDE2MDQGA1UEAxMt VmVyaVNpZ24gQ2xhc3MgMyBJbnRlcm5hdGlvbmFsIFNlcnZlciBDQSAtIEczMB4X DTEyMDcyNjAwMDAwMFoXDTEzMDgwNzIzNTk1OVowgZIxCzAJBgNVBAYTAkpQMQ4w DAYDVQQIEwVUb2t5bzETMBEGA1UEBxQKU2hpYnV5YS1LdTEbMBkGA1UEChQSVE9L WVUgTElWQUJMRS5JTkMuMSUwIwYDVQQLFBxJbmZvcm1hdGlvbiBUZWNobm9sb2d5 IERlcHQuMRowGAYDVQQDFBF3d3cubGl2YWJsZS5jby5qcDCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAKNyt0zqrVmnIs+dC+bxToAnLz2SwyJ3HkUu4V2n 1zN7pTEpXkfLJEC8Ld9CLLtXVmbbkSsJoBZoBZeG0yeIA3+91siHtZtQnRrddfLy 5GbBJzYh3i3nL6A93GpD63eTnjSHi6GDHiOoxMJYKbsSpBs7okRsTUuZ0Ha+wrUo HycdMAmse1rN7O7lg1Al6w1+XIlWIw2blgXtFNwWH8GFUrN7vLXuUoti8zcepkd6 1tEgPJJx3Yo2OSNg58VnlldStGW6BeBcGl6+KVNgoPVEHReuG8HShPhO+2VzajQ/ 1s4+z5SaOLRpwnOvgYwnwiFxGnMvmQpsqTcepbKXKRka8mkCAwEAAaOCAYQwggGA MBwGA1UdEQQVMBOCEXd3dy5saXZhYmxlLmNvLmpwMAkGA1UdEwQCMAAwDgYDVR0P AQH/BAQDAgWgMB8GA1UdIwQYMBaAFNebfNgioBX33a1fzimbWMO8RgC1MEEGA1Ud HwQ6MDgwNqA0oDKGMGh0dHA6Ly9TVlJJbnRsLUczLWNybC52ZXJpc2lnbi5jb20v U1ZSSW50bEczLmNybDBDBgNVHSAEPDA6MDgGCmCGSAGG+EUBBzYwKjAoBggrBgEF BQcCARYcaHR0cHM6Ly93d3cudmVyaXNpZ24uY29tL2NwczAoBgNVHSUEITAfBglg hkgBhvhCBAEGCCsGAQUFBwMBBggrBgEFBQcDAjByBggrBgEFBQcBAQRmMGQwJAYI KwYBBQUHMAGGGGh0dHA6Ly9vY3NwLnZlcmlzaWduLmNvbTA8BggrBgEFBQcwAoYw aHR0cDovL1NWUkludGwtRzMtYWlhLnZlcmlzaWduLmNvbS9TVlJJbnRsRzMuY2Vy MA0GCSqGSIb3DQEBBQUAA4IBAQCM44j34EFOSEDiAzUhQz9a8q08Fmx/MSnuP79g Xiso+0s2hfaOq5APBxv1ClyxjpyBUZC+ytX/rXkBOi+QYQx9VWu5FEQWrqmE+5OB UzGEKu/3TV36woXP6Un3YDk7aE1fv4zTn80L2LK0d62yEAgp5EPRHTapF4Ee42Bj ElItVZJaF4Ln9FVxY/lakFpFF6sbY6ABXDw1sDbsnnFEQbDbhCyq7behZOHaS/uo 6emye0+ZmnOWzKaIkPfTFC8r12jSrw9D1uOTzcz+or3lnFF3Yh6zW0bV7Gi0IRiH EdwdUg3YkyoMq6YXNxGQ7m3fJJ0BAQ4D2+9/5MOzp1UO4Mpa -----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAo3K3TOqtWaciz50L5vFO gCcvPZLDInceRS7hXafXM3ulMSleR8skQLwt30Isu1dWZtuRKwmgFmgFl4bTJ4gD f73WyIe1m1CdGt118vLkZsEnNiHeLecvoD3cakPrd5OeNIeLoYMeI6jEwlgpuxKk GzuiRGxNS5nQdr7CtSgfJx0wCax7Ws3s7uWDUCXrDX5ciVYjDZuWBe0U3BYfwYVS s3u8te5Si2LzNx6mR3rW0SA8knHdijY5I2DnxWeWV1K0ZboF4FwaXr4pU2Cg9UQd F64bwdKE+E77ZXNqND/Wzj7PlJo4tGnCc6+BjCfCIXEacy+ZCmypNx6lspcpGRry aQIDAQAB -----END PUBLIC KEY-----

ASN1 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 71895711749724983635437946681343801039 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.5 (sha1WithRSAEncryption) . . . . . . . . . . . . [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 'VeriSign, Inc.' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'VeriSign Trust Network' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Terms of use at https://www.verisign.com/rpa (c)10' . . . . . . . . . . . . [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 'VeriSign Class 3 International Server CA - G3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2012-07-26 00:00:00 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2013-08-07 23:59:59 +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 2.5.4.6 (countryName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'JP' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.8 (stateOrProvinceName) . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Tokyo' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.7 (localityName) . . . . . . . . . . . . . . . . . . . . [c:0|t:20|false] TeletexString, T61String 'Shibuya-Ku' . . . . . . . . . . . . [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:20|false] TeletexString, T61String 'TOKYU LIVABLE.INC.' . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.11 (organizationalUnitName) . . . . . . . . . . . . . . . . . . . . [c:0|t:20|false] TeletexString, T61String 'Information Technology Dept.' . . . . . . . . . . . . [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:20|false] TeletexString, T61String 'www.livable.co.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 20633412285990083550176438881637297182143746163443831219128053325999525529845436247806118969814059007312563893235201235188486289827367742953447979119130290007182763421958465169041091819514288874414000980847957779813766303325911540730471008180180908232712670329735582126981501548217782132619839583570114577975992049085858978993497838376512300238436207790377751624701075048138704938646250055509196004185043332393648737370930198893790098146370639630054598796147093609301099578901205067262616615312656473444423856604443037835318953549186185975349765978076283272966379715608688020796844567056083778925843540949331217150569 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.17 (subjectAltName) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (21 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.livable.co.jp' . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.19 (basicConstraints) . . . . . . . . . . . . . . . . . . . . [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 2.5.29.15 (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 2.5.29.35 (authorityKeyIdentifier) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName d79b7cd822a015f7ddad5fce299b58c3bc4600b5 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.29.31 (cRLDistributionPoints) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (58 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://SVRIntl-G3-crl.verisign.com/SVRIntlG3.crl' . . . . . . . . . . . . . . . . [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 (60 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.16.840.1.113733.1.7.54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 'https://www.verisign.com/cps' . . . . . . . . . . . . . . . . [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 (33 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.16.840.1.113730.4.1 (serverGatedCrypto) . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 1.3.6.1.5.5.7.1.1 (authorityInfoAccess) . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (102 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.verisign.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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://SVRIntl-G3-aia.verisign.com/SVRIntlG3.cer' . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.2.840.113549.1.1.5 (sha1WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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