studentbook.co
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:7c:89:79:25:de:25:8e:08:cc:ed:e5:cc:d8:be:c7:64:89 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): 03:7c:89:79:25:de:25:8e:08:cc:ed:e5:cc:d8:be:c7:64:89Serial Number (int): 303714604564868955665728497249934018831497
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 0e:22:de:0b:cf:f2:75:fe:25:e2:0c:bf:72:88:bb:17:68:5d:c5:8e
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): b4:c9:7b:88:cd:f9:7e:18:d9:75:bb:96:b4:2b:df:d8:7e:94:e6:13
Fingerprint (sha256): 9d:39:ed:87:a5:cf:62:78:22:ae:18:e5:2e:38:73:01:ee:91:cd:7b:2d:28:cb:66:c3:d4:07:8c:bd:93:ae:6f
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----- MIIGVDCCBTygAwIBAgISA3yJeSXeJY4IzO3lzNi+x2SJMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA1MDkwMzA2MThaFw0x OTA4MDcwMzA2MThaMBkxFzAVBgNVBAMTDnN0dWRlbnRib29rLmNvMIICIjANBgkq hkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAzUHPRsfggSL7nvXe5rMBdaZvksLRjt3t P2duvc3NOHTBSJnWOUwIbHv8JFXYw1+NjaMT+oOLquqFOh0p7vfSmNOO5RSdWJuk NUQ5qptFGdLQG+nVVHfhJEtOFLHA9jlDTme4JLe/N4dJVs+/N/ALkfFMvj2LU/fD EgIj3TJ76Rrt6IubiwsRHoUyq3UTfnIUHRuuublm8vz2KHBJHfZp7V3i6RtBVVfj n2aNL4A9U57voFrWXpMuK4poVjQezcff78Db1R7O2uc9yj4OgvPjnCgyZrO+B11k J0+ariHZIjIaswo7wuVLM+x9gJ36Uh/QXg9Nq6LgUVlNbEN2pFuAfbZdpaDwyc/j KNxkyaUdqZ+R5+uI7siujxaaboHcuTqDqH63lyjLXXGcOVKQpx9NcNZVsy0HtSq8 aV1bUk2X8ioWtvNxcmaskVdzxlyVzaBCX3Sa5YoOl4w8/0044J2wQV1EHwq2wCjp vuD8Y5KhUcevqqo9Eg9x6LriH5/nLDYWJA1YgtIHi5uz5mYhqMEQbDE5Xq3SsLDB LHAyEtyAtlDpJ1fThMurxjjBnESJQHlS6pnor87Q9jIZuyxhghMH33R/39zcIscW d8BAk4C2pdeE3G+zmh5N5cJ6Ut2L2ujTjS9qAUMUj8ZOv3ihB056sAztp6KGH8NH onfnjH8HOx8CAwEAAaOCAmMwggJfMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAU BggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUDiLe C8/ydf4l4gy/coi7F2hdxY4wHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo 7KEwbwYIKwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQt eDMubGV0c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQt eDMubGV0c2VuY3J5cHQub3JnLzAZBgNVHREEEjAQgg5zdHVkZW50Ym9vay5jbzBM BgNVHSAERTBDMAgGBmeBDAECATA3BgsrBgEEAYLfEwEBATAoMCYGCCsGAQUFBwIB FhpodHRwOi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCCAQQGCisGAQQB1nkCBAIEgfUE gfIA8AB2AOJpS64m6OlACeiGG7Y7g9Q+5/50iPukjyiTAZ3d8dv+AAABaprFPUcA AAQDAEcwRQIgfdzu1Qtpjuet/z8PMnp3AkvEB0IHwnyvf7m7pxy2wokCIQDz8F8y +KiOPr173GxNSad5CeOhRyiRI2V/ZGs+otfwMAB2AGPy283oO8wszwtyhCdXazOk jWF3j711pjixx2hUS9iNAAABaprFPTIAAAQDAEcwRQIgOpmKpHGhGbzPg93VLLEj GCNEBZbwrBilDuG8LCM6PY4CIQDk/A/DfraZp/MLnihnw1/CnC5E2aumNBZ3ybjf RxdJZDANBgkqhkiG9w0BAQsFAAOCAQEAQYULNIgIyjHk8EA0XWb/VbKxVtN1TkCw 7cI3Q2w+obEHuJyzEiast3hCnsQ48CU+Au9ee2u6PAoMNjMP0HgDmjywSIPjnIUh TXShci1rAl/P5s6r/WmdZSLjPYOAw/pX1WoXgjppkZxlKE6/UdkeMiG1ZM8gtQls GmVcCMpqcjkuXeSb5seAHD8izPspxhGl4JS96d7Y+mNeFgG0KL2KZUbHFyIt/5Jv ZmKm+Jj8tn2waBne8GLvw87PadU2+wOqe9S5X3gzgCvC506c4yWRVzEt33lGjljh yi0zjDsHdGC+Ug2VNoRexUeyQ2IkC7cfMuSXta0mhlLAS9ux1VVphw== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAzUHPRsfggSL7nvXe5rMB daZvksLRjt3tP2duvc3NOHTBSJnWOUwIbHv8JFXYw1+NjaMT+oOLquqFOh0p7vfS mNOO5RSdWJukNUQ5qptFGdLQG+nVVHfhJEtOFLHA9jlDTme4JLe/N4dJVs+/N/AL kfFMvj2LU/fDEgIj3TJ76Rrt6IubiwsRHoUyq3UTfnIUHRuuublm8vz2KHBJHfZp 7V3i6RtBVVfjn2aNL4A9U57voFrWXpMuK4poVjQezcff78Db1R7O2uc9yj4OgvPj nCgyZrO+B11kJ0+ariHZIjIaswo7wuVLM+x9gJ36Uh/QXg9Nq6LgUVlNbEN2pFuA fbZdpaDwyc/jKNxkyaUdqZ+R5+uI7siujxaaboHcuTqDqH63lyjLXXGcOVKQpx9N cNZVsy0HtSq8aV1bUk2X8ioWtvNxcmaskVdzxlyVzaBCX3Sa5YoOl4w8/0044J2w QV1EHwq2wCjpvuD8Y5KhUcevqqo9Eg9x6LriH5/nLDYWJA1YgtIHi5uz5mYhqMEQ bDE5Xq3SsLDBLHAyEtyAtlDpJ1fThMurxjjBnESJQHlS6pnor87Q9jIZuyxhghMH 33R/39zcIscWd8BAk4C2pdeE3G+zmh5N5cJ6Ut2L2ujTjS9qAUMUj8ZOv3ihB056 sAztp6KGH8NHonfnjH8HOx8CAwEAAQ== -----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 303714604564868955665728497249934018831497 . . . . . . . . [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 2019-05-09 03:06:18 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-08-07 03:06:18 +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 837375784120884406974112997350195913421717088271401053059896299383121331117522004263798302080207523226617861608947291520492219519317553590722656849218237343192711831492678198406098831985992796716267131303599018774644909453786770777628654698788837829766745616862210552289263124009701036791306387107227916594647764225952780975350134478306145567001245011240969634215293284409775465593906564653351392975679755022273711694786487689259921750236319700917198395228381329559670774899815816423027691791523304168780341401645043601991061346481076709490282525481179616248478371265352599944499901039732891534455549931436595810218429983944296988818558189280527129569587013795563103580386330121496175792772363807368290878302953266934958259087531269249772741082267267087795459873906912691633631831307322266294012378368338703669666760053122985323815129076283827176904251588473719940426814878941072130081597984076405545598488364914233331428245094208983343165592401323537287473743549107147343244599586891030730109192525014103511352933737915581088606370104781628081602258450083931403054860509709388514014171504116732115350210525632965156429278243759405148326689765144328744763158617203391801045028853002797704409402147893335864062626453798518202955152159 . . . . . . . . . . . . . . . . . . . . [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) 0e22de0bcff275fe25e20cbf7288bb17685dc58e . . . . . . . . . . . . . . . . [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) 00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016a9ac53d47000004030047304502207ddceed50b698ee7adff3f0f327a77024bc4074207c27caf7fb9bba71cb6c289022100f3f05f32f8a88e3ebd7bdc6c4d49a77909e3a147289123657f646b3ea2d7f03000760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016a9ac53d32000004030047304502203a998aa471a119bccf83ddd52cb1231823440596f0ac18a50ee1bc2c233a3d8e022100e4fc0fc37eb699a7f30b9e2867c35fc29c2e44d9aba6341677c9b8df47174964 . . . . [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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