www.viewsys.jp

Issued by RapidSSL CA

About this certificate

This digital certificate with serial number 10:96:77 was issued on by GeoTrust, Inc..

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:
  • Subscriber Certificate: commonName is deprecated. (BRs: 7.1.4.2.2)

Certificate Subject

SERIALNUMBER=1GuTqbZrpeXT7N3HP-YkU0jUx33ISINT,CN=www.viewsys.jp,OU=GT23845785+OU=See www.rapidssl.com/resources/cps (c)14+OU=Domain Control Validated - RapidSSL(R)

GeoTrust, Inc.

Organization: GeoTrust, Inc.
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 10:96:77
Serial Number (int): 1087095
Serial Number lenght: 21 bits, 3 octets

SubjectKeyId: f7:69:03:46:8c:0a:92:95:e0:1b:c5:69:a6:80:7d:7e:b8:1e:8b:b4
AuthorityKeyId: 6b:69:3d:6a:18:42:4a:dd:8f:02:65:39:fd:35:24:86:78:91:16:30

Fingerprint (sha1): a2:ab:18:cf:6b:58:f4:95:d9:d5:c2:d2:1e:de:62:65:01:35:32:21
Fingerprint (sha256): 3c:6c:ba:cb:fb:74:05:2b:a4:2f:65:23:aa:f0:a3:d4:22:fd:1e:18:ac:38:2e:5d:64:09:35:93:40:39:5f:44

Issuing Certificate URL: http://rapidssl-aia.geotrust.com/rapidssl.crt

Revocation information

OCSP Server: http://rapidssl-ocsp.geotrust.com
CRL Distribution Point: http://rapidssl-crl.geotrust.com/crls/rapidssl.crl

Check the revocation status for certificate www.viewsys.jp

2

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.viewsys.jp

Public Key Algorithm

RSA

Key Size

2048

Signature Algorithm

SHA1 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.viewsys.jp
viewsys.jp

Other certificates including the domain name viewsys.jp

(limited to 100 certificates)
sv2.viewsys.jp
www.viewsys.jp
www.viewsys.jp
sv1.viewsys.jp
www.viewsys.jp
sv3.viewsys.jp
www.viewsys.jp
sv5.viewsys.jp
sv1.viewsys.jp
sv4.viewsys.jp
sv5.viewsys.jp
www.viewsys.jp
www.viewsys.jp
sv5.viewsys.jp
sv1.viewsys.jp
sv3.viewsys.jp
sv1.viewsys.jp
sv6.viewsys.jp
sv4.viewsys.jp

Certificate

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

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIFLjCCBBagAwIBAgIDEJZ3MA0GCSqGSIb3DQEBBQUAMDwxCzAJBgNVBAYTAlVT
MRcwFQYDVQQKEw5HZW9UcnVzdCwgSW5jLjEUMBIGA1UEAxMLUmFwaWRTU0wgQ0Ew
HhcNMTQwMjA4MTgwMjM5WhcNMTUwMzEzMjAwODA2WjCBvTEpMCcGA1UEBRMgMUd1
VHFiWnJwZVhUN04zSFAtWWtVMGpVeDMzSVNJTlQxEzARBgNVBAsTCkdUMjM4NDU3
ODUxMTAvBgNVBAsTKFNlZSB3d3cucmFwaWRzc2wuY29tL3Jlc291cmNlcy9jcHMg
KGMpMTQxLzAtBgNVBAsTJkRvbWFpbiBDb250cm9sIFZhbGlkYXRlZCAtIFJhcGlk
U1NMKFIpMRcwFQYDVQQDEw53d3cudmlld3N5cy5qcDCCASIwDQYJKoZIhvcNAQEB
BQADggEPADCCAQoCggEBAMAgS3hn+yKGwBqlbR1Q0aKz3QUQO367Z1ekA3BzsgYR
gJity35ivoEY/WBQFx6gZz++8MF6vlbp4CJjEJaM4N7+1sB8T+DJTLf/0z2DNXbN
c1iaVnhdkYgBFL1z3TKSt2EjGePrp8G8alDsQwB9BzfHSQbgEGu9lUMu6blwaFzf
p6S/eQ+SzYmTy4Jfo/d2gBukN/TCqmutA6HRnlcfO+NDDJh7524j+XMB+LYp/VYa
2Bo60Hy8kpou+xXtNZ7h9XKod7JbtIcq3b7afpDIo44PMf34S1D5C3z6eTWcllc2
XV+anPaGFiLaBApDVBnaKTvCIhYKrK9/MZkOT2liM2kCAwEAAaOCAbUwggGxMB8G
A1UdIwQYMBaAFGtpPWoYQkrdjwJlOf01JIZ4kRYwMA4GA1UdDwEB/wQEAwIFoDAd
BgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwJQYDVR0RBB4wHIIOd3d3LnZp
ZXdzeXMuanCCCnZpZXdzeXMuanAwQwYDVR0fBDwwOjA4oDagNIYyaHR0cDovL3Jh
cGlkc3NsLWNybC5nZW90cnVzdC5jb20vY3Jscy9yYXBpZHNzbC5jcmwwHQYDVR0O
BBYEFPdpA0aMCpKV4BvFaaaAfX64Hou0MAwGA1UdEwEB/wQCMAAweAYIKwYBBQUH
AQEEbDBqMC0GCCsGAQUFBzABhiFodHRwOi8vcmFwaWRzc2wtb2NzcC5nZW90cnVz
dC5jb20wOQYIKwYBBQUHMAKGLWh0dHA6Ly9yYXBpZHNzbC1haWEuZ2VvdHJ1c3Qu
Y29tL3JhcGlkc3NsLmNydDBMBgNVHSAERTBDMEEGCmCGSAGG+EUBBzYwMzAxBggr
BgEFBQcCARYlaHR0cDovL3d3dy5nZW90cnVzdC5jb20vcmVzb3VyY2VzL2NwczAN
BgkqhkiG9w0BAQUFAAOCAQEAGOhpKVyrDb4YGWsWbxz9FZ3IAELSHygpgyksorJ5
1EPdtxtdBG17nP7M1oQW6dOGua4acRnCMN6FwUmjuaCOPunmzfa8soAF9UpKM8Dh
waqy2YCS/gBw4oDMHuMfC5gCrMCD+pYi6fKA0mVXytEj0kG2+4eoO/kAVngkdZIO
WwdVquy2ZkcCJv5++0Uvj4aRmvUq0NXaZcCT9BYZVXk60DiNIDPlBvdjDb359aim
w/YTaYDMdLZjkPCRzaiALcKXozzQsHNQgkU9MGg8yz4khR7NXVRXOYxpzzjVINqf
CU+Fj4y1LFjkMhQnSXb8WdhSp+TVAGB4y5MK+aVMkhfvbw==
-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwCBLeGf7IobAGqVtHVDR
orPdBRA7frtnV6QDcHOyBhGAmK3LfmK+gRj9YFAXHqBnP77wwXq+VungImMQlozg
3v7WwHxP4MlMt//TPYM1ds1zWJpWeF2RiAEUvXPdMpK3YSMZ4+unwbxqUOxDAH0H
N8dJBuAQa72VQy7puXBoXN+npL95D5LNiZPLgl+j93aAG6Q39MKqa60DodGeVx87
40MMmHvnbiP5cwH4tin9VhrYGjrQfLySmi77Fe01nuH1cqh3slu0hyrdvtp+kMij
jg8x/fhLUPkLfPp5NZyWVzZdX5qc9oYWItoECkNUGdopO8IiFgqsr38xmQ5PaWIz
aQIDAQAB
-----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 1087095
 . . . . . . . . [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 'GeoTrust, Inc.'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.3 (commonName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'RapidSSL CA'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2014-02-08 18:02:39 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2015-03-13 20:08:06 +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 2.5.4.5 (serialNumber)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString '1GuTqbZrpeXT7N3HP-YkU0jUx33ISINT'
 . . . . . . . . . . . . [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 'GT23845785'
 . . . . . . . . . . . . [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 'See www.rapidssl.com/resources/cps (c)14'
 . . . . . . . . . . . . [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 'Domain Control Validated - RapidSSL(R)'
 . . . . . . . . . . . . [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.viewsys.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 24253679715861987679279389160455003560833632368276457708375517931297051556515102711782435111510736209001543507957709383620177699179123760338151143143687788855551161679256924355623358508842326253068990960405349575101214893189474821598608538051862554493388649220316612349530936018838809947863830281409693696288360779527861521384249147917175153550419913584255985359674214331415913283303797213665867370981870913339486083319011087247825589871004087046429526781401762188793150118512533607940586784134139517180459140871674876786457032198796058941896610482958779545507378999725229882503632999532668168461510651351117825454953
 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.35 (authorityKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 6b693d6a18424add8f026539fd35248678911630
 . . . . . . . . . . . . . . . . [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 2.5.29.17 (subjectAltName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (30 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.viewsys.jp'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'viewsys.jp'
 . . . . . . . . . . . . . . . . [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 (60 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://rapidssl-crl.geotrust.com/crls/rapidssl.crl'
 . . . . . . . . . . . . . . . . [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)
							f76903468c0a9295e01bc569a6807d7eb81e8bb4
 . . . . . . . . . . . . . . . . [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 1.3.6.1.5.5.7.1.1 (authorityInfoAccess)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (108 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://rapidssl-ocsp.geotrust.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://rapidssl-aia.geotrust.com/rapidssl.crt'
 . . . . . . . . . . . . . . . . [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 2.16.840.1.113733.1.7.54
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 'http://www.geotrust.com/resources/cps'
 . . . . [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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