k1.k2.t.u-tokyo.ac.jp
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:11:6b:b0:b5:da:ee:cc:84:3d:c5:02:7a:74:dd:8c:aa:80 was issued on by Let's Encrypt.
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
CN=k1.k2.t.u-tokyo.ac.jp
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:11:6b:b0:b5:da:ee:cc:84:3d:c5:02:7a:74:dd:8c:aa:80Serial Number (int): 267264802961194564313570872568202415352448
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 4a:ed:fd:af:d4:27:5a:6e:29:e3:43:7d:a9:b5:5e:b6:1e:80:96:96
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 83:a0:10:17:47:fc:6a:ba:96:3f:20:0f:82:aa:6c:49:d8:46:9c:89
Fingerprint (sha256): 05:bf:3a:33:93:f7:96:7a:84:70:9c:45:17:e1:da:53:64:b5:c3:aa:f4:42:86:8f:dd:e1:53:ca:29:77:f8:dc
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate k1.k2.t.u-tokyo.ac.jp
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for k1.k2.t.u-tokyo.ac.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
k1.k2.t.u-tokyo.ac.jp
www.k2.t.u-tokyo.ac.jp
www.k2.t.u-tokyo.ac.jp
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Certificate
The complete raw certificate details for k1.k2.t.u-tokyo.ac.jp in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFeDCCBGCgAwIBAgISAxFrsLXa7syEPcUCenTdjKqAMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0yMDAzMDYwNDQwMDlaFw0y MDA2MDQwNDQwMDlaMCAxHjAcBgNVBAMTFWsxLmsyLnQudS10b2t5by5hYy5qcDCC ASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAL4q4kaAQ9eKQGpPwUmWWrdb hZnK13ctt3wp1Uaz8W6IWZrYV1ahvpXa1m7x5bhaj+OI7X4JJ5aBW332W9S+Zwaw EjUDhBeYS4bj+B22kvs+scnvDkOMd4EJurKj4iNjphdvpPq4ipTTN68gYvtZYx6l upVK3/M7/3HpnHXZ0SGwziCmM2pmFXsh+/GknO4H3MRUgs0vWcPuTA4wQMdVQUQl JCeUeKvlO2p29xKJzE3ctxl+A71YqR2ZePN+ovE001JIOrWySH3uHh+7USBQgqRt Mvz+BLJYNGKirWPTS8I3CBqgDJ7NptnF6EHwYBzPRxvhU3KnBQJLd1f2kNSrYbMC AwEAAaOCAoAwggJ8MA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcD AQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUSu39r9QnWm4p40N9 qbVeth6AlpYwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEwbwYIKwYB BQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMubGV0c2Vu Y3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0c2Vu Y3J5cHQub3JnLzA4BgNVHREEMTAvghVrMS5rMi50LnUtdG9reW8uYWMuanCCFnd3 dy5rMi50LnUtdG9reW8uYWMuanAwTAYDVR0gBEUwQzAIBgZngQwBAgEwNwYLKwYB BAGC3xMBAQEwKDAmBggrBgEFBQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5v cmcwggECBgorBgEEAdZ5AgQCBIHzBIHwAO4AdQBep3P531bA57U2SH3QSeAyepGa DIShEhKEGHWWgXFFWAAAAXCuW7BpAAAEAwBGMEQCIHIvnPofpVL1e8rBcyTWSCJW bMDbiYR4MfjP7+a8Hm4XAiBURVl1UyBGjVmtAe3+hthpOo4uskF3SEtpuRUpu362 WgB1ALIeBcyLos2KIE6HZvkruYolIGdr2vpw57JJUy3vi5BeAAABcK5bsFsAAAQD AEYwRAIgW2AdYZwTT9uZq/hF30AwumFP/m9BkXrm5SJ1/ogZ63MCIFteRg68ZzPj fYnWIX0YkJPGM3I55Yr2WjpHKxbQxF6wMA0GCSqGSIb3DQEBCwUAA4IBAQBctGTd zzjrKnq6N7Nn/XXyLFR31O4cWXCqMEq1layCpuE6aXsid4ppH7Zh4A1gCdIqXvjM 27DETEqIa7UTK0GTk0NOJl5/3axloFOM2JmfGsfNpFpNF7KOSkQFbaLYLc4I5TnA QpzbvpmbecLqa8fmIcRUpelBXkaNXurdK0/CwL/FCA6SHV6mGypQ5G0DQw7n/NmT kItvwEZmaleoGwnQQtxqeOyO+RUlynfYoddxVnmmrbHZb9VUXqlAoPyrXEF69YnP mIMChC9bJL+vJKIPH8Vt26vQiDkOiEIdTNty/K99BHqAtu3JInOxuj36QsTq0+Tm DPKE0I/CrkqkPizO -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAviriRoBD14pAak/BSZZa t1uFmcrXdy23fCnVRrPxbohZmthXVqG+ldrWbvHluFqP44jtfgknloFbffZb1L5n BrASNQOEF5hLhuP4HbaS+z6xye8OQ4x3gQm6sqPiI2OmF2+k+riKlNM3ryBi+1lj HqW6lUrf8zv/cemcddnRIbDOIKYzamYVeyH78aSc7gfcxFSCzS9Zw+5MDjBAx1VB RCUkJ5R4q+U7anb3EonMTdy3GX4DvVipHZl4836i8TTTUkg6tbJIfe4eH7tRIFCC pG0y/P4Eslg0YqKtY9NLwjcIGqAMns2m2cXoQfBgHM9HG+FTcqcFAkt3V/aQ1Kth swIDAQAB -----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 267264802961194564313570872568202415352448 . . . . . . . . [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 2020-03-06 04:40:09 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-06-04 04:40:09 +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 'k1.k2.t.u-tokyo.ac.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 24006424777005629874797161391392438167775594412121901721735858484805152522270504490479951408934728763150503263804653223517142906009817091132304754976404334275328036784724662271938394800078964239907272589673495539872461970934959251226473902225056158522528167919400951769089158116525832833795933537065586239821288123745671136433197964884727517870582586051934129646302235503814378470450095992883309510825707804125446744917898292660801968841801887058112782957975175078631024815327562766479041105826406634090689174641232119643601267708970689344892699998103874991583169961125884651958723582418908646977926907834311474110899 . . . . . . . . . . . . . . . . . . . . [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) 4aedfdafd4275a6e29e3437da9b55eb61e809696 . . . . . . . . . . . . . . . . [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 (49 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'k1.k2.t.u-tokyo.ac.jp' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.k2.t.u-tokyo.ac.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 (243 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes) 00ee0075005ea773f9df56c0e7b536487dd049e0327a919a0c84a11212841875968171455800000170ae5bb06900000403004630440220722f9cfa1fa552f57bcac17324d64822566cc0db89847831f8cfefe6bc1e6e170220544559755320468d59ad01edfe86d8693a8e2eb24177484b69b91529bb7eb65a007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e00000170ae5bb05b000004030046304402205b601d619c134fdb99abf845df4030ba614ffe6f41917ae6e52275fe8819eb7302205b5e460ebc6733e37d89d6217d189093c6337239e58af65a3a472b16d0c45eb0 . . . . [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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