studentbook.co
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:1c:b9:3c:7e:ab:4a:d6:08:71:35:ad:83:63:36:28:fa:8f 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=studentbook.co
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:1c:b9:3c:7e:ab:4a:d6:08:71:35:ad:83:63:36:28:fa:8fSerial Number (int): 271110985355253524933760237698601267559055
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 0d:ec:7f:47:6c:45:fb:cf:05:a9:ac:50:bd:1a:f0:d7:90:97:04:79
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 58:cf:cb:99:b1:64:9a:b9:5a:fa:fa:58:13:51:29:4e:91:29:4d:ba
Fingerprint (sha256): c3:29:6e:0a:81:a8:d0:47:77:71:cb:e7:d3:80:a5:ec:06:03:e8:89:4a:f9:30:f2:25:d8:c3:55:d3:33:ad:ff
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate studentbook.co
1
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for studentbook.co
Public Key Algorithm
RSA
Key Size
4096
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
studentbook.co
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Certificate
The complete raw certificate details for studentbook.co in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGVDCCBTygAwIBAgISAxy5PH6rStYIcTWtg2M2KPqPMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTAzMDkwNTA3MDVaFw0x OTA2MDcwNTA3MDVaMBkxFzAVBgNVBAMTDnN0dWRlbnRib29rLmNvMIICIjANBgkq hkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAriNKhpbCEXfuXC4ucjTwMveXBc3IdBsl SvJQ+F93mQU/eohqIf7Z0qnPveK2OYHsjpQZSLbnFggaes0A1RegC30ZSrbsE/xI tFf79iHRxj7oqieH7dJ9hyXpkBnuvnEq/n8ZcpiUFvMGOhHSwFKby44PuNpX8zl+ iD8vufL1cmRjPqPBbbTIRZrOW8qZwvFbZbIMNkgoFBfg65TVXYNO2ERAbd1z4jnm dR/cIcQl7Jqnhda5wdCPBg34M8/lruNoNCkrDT4LR9fgOJqChmwsnQg6vIaKFOzw DxcO2zUs4zbS98PQ3/q6Uy+5LevvFYLp8+7Z0A6dUTmNQe0bjpcEamk/uk72RZmH 7PCSMKSX3XduNMx++tE4QuTX/TMhZlOInQ8ddSy4QBz6HqTOInUi+0kvcTELm+o2 TkIRUMc0Bua+kqdWo0H+GzlTx6gfa5L85g/pQxn6EOP0jhka2IOFoavgGZG64Eiq 1aDuph+p5AGj3EkU9Sv09LCuCKmuCTuCw18pd5OED9oTh1UHjLCNBriR/3YnOzOQ EfCbks3KeGSYWLNx6nv6BdYG9Z7I7A80UdPOkq/sTa2l/lvkbsJ9aiH0pYz1Cw2k wad3Uv51v5KALXie7cH80Xe8K8nYZr3koIzezORvyF054DXMerggGe3jILFKPtxn 09H/d+75un8CAwEAAaOCAmMwggJfMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAU BggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUDex/ R2xF+88FqaxQvRrw15CXBHkwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo 7KEwbwYIKwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQt eDMubGV0c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQt eDMubGV0c2VuY3J5cHQub3JnLzAZBgNVHREEEjAQgg5zdHVkZW50Ym9vay5jbzBM BgNVHSAERTBDMAgGBmeBDAECATA3BgsrBgEEAYLfEwEBATAoMCYGCCsGAQUFBwIB FhpodHRwOi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCCAQQGCisGAQQB1nkCBAIEgfUE gfIA8AB2AHR+2oMxrTMQkSGcziVPQnDCv/1eQiAIxjc1eeYQe8xWAAABaWEP5VIA AAQDAEcwRQIgPOihvLrNQmDq5/4k4HRLqqTcWrLIn+OXlClkZv11SvUCIQCdrCBI NYzgON/jULPH5Q1MryriShqfbmqnPM/GBAksCgB2ACk8UZZUyDlluqpQ/FgH1Ldv v1h6KXLcpMMM9OVFR/R4AAABaWEP5VgAAAQDAEcwRQIgKFBvV7dDdUaSHf7NgpeG Ii/6X6TOagDyK6ahQtac10UCIQDon/9FBDAbB41hhKAJl1t4R0uKEt7pM69RTz6r EkIRFDANBgkqhkiG9w0BAQsFAAOCAQEAbCbKyQ96aQ59umAZoOnMhhFz5Sg6jQxo q9UfPQU3ZLUYqCgdnnD+ZBy7i58/VjSE4hCsnXXKkJBiX2ElFbFr91mx12CuDPD1 dxNgM8reLtqNZWX5VrT3886CewpxA0IDhd+Tpqu95NPQMKFosIwmQF0tfvXCZrii RNuuFvGrNec40G/S5Lzbsdsc8kmedSm/I1qZ8+K90GMr54lNS67VxCWfnmdQKV+F 1Mu4QAMMiHUHE89hwSDGcwGQFG5A/k5pqOGV75BdqYt3Wv6X3kMDgNkLmG8UjV52 ytT0sewTgsxVAmzU1wkT9xsAMwcvokrhV2E+BttIIbDb+iofH7CS+g== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAriNKhpbCEXfuXC4ucjTw MveXBc3IdBslSvJQ+F93mQU/eohqIf7Z0qnPveK2OYHsjpQZSLbnFggaes0A1Reg C30ZSrbsE/xItFf79iHRxj7oqieH7dJ9hyXpkBnuvnEq/n8ZcpiUFvMGOhHSwFKb y44PuNpX8zl+iD8vufL1cmRjPqPBbbTIRZrOW8qZwvFbZbIMNkgoFBfg65TVXYNO 2ERAbd1z4jnmdR/cIcQl7Jqnhda5wdCPBg34M8/lruNoNCkrDT4LR9fgOJqChmws nQg6vIaKFOzwDxcO2zUs4zbS98PQ3/q6Uy+5LevvFYLp8+7Z0A6dUTmNQe0bjpcE amk/uk72RZmH7PCSMKSX3XduNMx++tE4QuTX/TMhZlOInQ8ddSy4QBz6HqTOInUi +0kvcTELm+o2TkIRUMc0Bua+kqdWo0H+GzlTx6gfa5L85g/pQxn6EOP0jhka2IOF oavgGZG64Eiq1aDuph+p5AGj3EkU9Sv09LCuCKmuCTuCw18pd5OED9oTh1UHjLCN BriR/3YnOzOQEfCbks3KeGSYWLNx6nv6BdYG9Z7I7A80UdPOkq/sTa2l/lvkbsJ9 aiH0pYz1Cw2kwad3Uv51v5KALXie7cH80Xe8K8nYZr3koIzezORvyF054DXMergg Ge3jILFKPtxn09H/d+75un8CAwEAAQ== -----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 271110985355253524933760237698601267559055 . . . . . . . . [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 2019-03-09 05:07:05 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-06-07 05:07:05 +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 'studentbook.co' . . . . . . . . [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 (4208 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 710420470932028288688595323961081652803399454370486320885960131460067066037856945548454515910587741965503248078309685814028443869283136491338064183374049053554508861750990118823446672573468237040414115600588928475614530134544323652779852923833689472050315115091361152536062318174664872704178246149294079544590060734899514743168023585931347783247487548830405208606975021797539061364924891170570964470098803911897378642322740798522592850333095779926480764454012713203333149191661471308188849959810440859209480060509972736321456121483720118711791442062134116538373418107336485643255379074195667354214652233769039140423215102100515457546842878020499566631499291873097217768077712682242709210145692072276795173345200367776288183692749103917265050885181280168997224377915638055564551555727938236791186047143148241929313492215581538724185446773074165736399429549632160623158459018895843676261501865826234050640494790923496496199863914957563264028330781586806430810987437917497992264626669724083489211009834616184368470835332811512169200282083730362860108191487326213681864254834177463293657788860061997197729428572124454349054683930451670746969378435448252069590023874374115961183749328642151059070492315579716038005576940148508221534485119 . . . . . . . . . . . . . . . . . . . . [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) 0dec7f476c45fbcf05a9ac50bd1af0d790970479 . . . . . . . . . . . . . . . . [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 (18 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'studentbook.co' . . . . . . . . . . . . . . . . [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 (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f0007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc5600000169610fe552000004030047304502203ce8a1bcbacd4260eae7fe24e0744baaa4dc5ab2c89fe39794296466fd754af50221009dac2048358ce038dfe350b3c7e50d4caf2ae24a1a9f6e6aa73ccfc604092c0a007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000169610fe5580000040300473045022028506f57b7437546921dfecd829786222ffa5fa4ce6a00f22ba6a142d69cd745022100e89fff4504301b078d6184a009975b78474b8a12dee933af514f3eab12421114 . . . . [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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