studentbook.co
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:7b:91:dc:58:88:14:17:6f:18:ce:73:99:9f:c5:a9:fd:6a 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): 03:7b:91:dc:58:88:14:17:6f:18:ce:73:99:9f:c5:a9:fd:6aSerial Number (int): 303385471086887154662933607071769437011306
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: c4:3e:8b:20:da:7b:60:e9:ec:f7:b3:b9:1c:9f:ed:d4:07:9d:b8:b6
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 61:f1:b5:f7:13:9d:07:6e:af:07:4b:96:00:9b:e3:74:08:84:7a:f2
Fingerprint (sha256): e9:3f:98:02:33:60:5f:c2:46:79:32:b0:e6:95:a9:c9:8d:21:66:2e:c4:99:1c:93:ff:7b:05:c5:00:de:7a:8f
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----- MIIGVDCCBTygAwIBAgISA3uR3FiIFBdvGM5zmZ/Fqf1qMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA3MTIwOTU1MTNaFw0x OTEwMTAwOTU1MTNaMBkxFzAVBgNVBAMTDnN0dWRlbnRib29rLmNvMIICIjANBgkq hkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAvR7vUrXd23gNNbaAYoHTq56EOhz13ksP aU3zVwhU/zCBzRNZAit53IDfe4iMz6vB6zJHGKEYNNuLZ1m3A91HBkh+8uQDNQEp AOemLq8FiJ4xeIe9biGDviFyfXfmCm5IOcf2xs3guCTQTpVwTRjT2aq9IOvKEHr1 iVeXm7V01nzjpmUPRNcCF0mDXE5WSHRB0Uy1C/Vy7T3PoaKz0OuWfhR2n8LX5b1s XrXJESQr4qQ0qtSKLZ0SCjBAtMUxCTcJsmwJ2H4eR8k+GZ5oh+qe8tnF9SzpNfOw 4xHYSVFd024LLnXvYbbbPDqF3PzgFMr37BoKjS5ngNXAVhc7NJx3SkzIrdvKwgTY RDTBq3bDqFVSShjw/cqNvXjcgYwvIaSCgdwFyHxDAsAHOeF9SQJkiMO+E9k74hpn J8Zi2CTsyGyCkFd4CzjvLD/giGwcT0PvvRZ/I0CYFnKtTH8m+SB1cQGEs3bjLOjV 0GMSt4eKIQRzWUG9jcSk2BPY8rsKNKVJh2kjETZfnGLeIgqTwnWyBV+O5RggAqBh wX5U7M/oZJ4mSe0FB0Tqb5Newvj8XtG6w6si+te07v26/O8PSrPsBznWiuz14eVQ Jo7hko4ESgtQpIeX7Xf+VgJn/yXYm8d+sL6W7rkrALltP1nlZ4ijpX9PLlMqj5GK 1rTmo1+ZI5MCAwEAAaOCAmMwggJfMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAU BggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUxD6L INp7YOns97O5HJ/t1AeduLYwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo 7KEwbwYIKwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQt eDMubGV0c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQt eDMubGV0c2VuY3J5cHQub3JnLzAZBgNVHREEEjAQgg5zdHVkZW50Ym9vay5jbzBM BgNVHSAERTBDMAgGBmeBDAECATA3BgsrBgEEAYLfEwEBATAoMCYGCCsGAQUFBwIB FhpodHRwOi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCCAQQGCisGAQQB1nkCBAIEgfUE gfIA8AB1ACk8UZZUyDlluqpQ/FgH1Ldvv1h6KXLcpMMM9OVFR/R4AAABa+XSm/kA AAQDAEYwRAIgWQHKyiYmU1GGZoP1mNPtvFZFEMxhaKWBFDVtuFIJt1YCIGCIXI9Y SjWatTdC84988AWoTruykXFukBloHnNXeP7IAHcAb1N2rDHwMRnYmQCkURX/dxUc EdkCwQApBo2yCJo32RMAAAFr5dKdvwAABAMASDBGAiEA4+EnkGfAC5MmsbuXtJsA RYzpWr5H83iqLFNQeDPFFqcCIQD332OeQq5uMvf/UH5wtIPer3oeeqzTJbqaqFhk JYulKDANBgkqhkiG9w0BAQsFAAOCAQEAZoltrQg2pm3kiVw/otXK+qOZniDW4PFg NGVZXmH3QYl7C7TKcfexfD76RiuBFknZ3yqHmb1B4kD5LxDjjlks2b0l+AI0GuIE 2v/ziioXf/d+HthPIIVBQg9A7+eVgzSUpuiWoV3EuFrv6YOYIS2dwpVTSAoUZAHH YrUKPuUJUH2rOhXiufp49Fop8O6Jtp3U6X/xs5I7gw6IFZ/z3U6MGm4HnMTW9swr 05RpKVDzrtnlqjH3GcoJAHiMz3OdlXA7Cmzl8nw4VVdtshcIfaU2r7lonuvg0mwz yQdsJQF0Sj4DnWNUssjlfxnWfcQuAEy3FyspL+IVvtkF3whE0onFGg== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAvR7vUrXd23gNNbaAYoHT q56EOhz13ksPaU3zVwhU/zCBzRNZAit53IDfe4iMz6vB6zJHGKEYNNuLZ1m3A91H Bkh+8uQDNQEpAOemLq8FiJ4xeIe9biGDviFyfXfmCm5IOcf2xs3guCTQTpVwTRjT 2aq9IOvKEHr1iVeXm7V01nzjpmUPRNcCF0mDXE5WSHRB0Uy1C/Vy7T3PoaKz0OuW fhR2n8LX5b1sXrXJESQr4qQ0qtSKLZ0SCjBAtMUxCTcJsmwJ2H4eR8k+GZ5oh+qe 8tnF9SzpNfOw4xHYSVFd024LLnXvYbbbPDqF3PzgFMr37BoKjS5ngNXAVhc7NJx3 SkzIrdvKwgTYRDTBq3bDqFVSShjw/cqNvXjcgYwvIaSCgdwFyHxDAsAHOeF9SQJk iMO+E9k74hpnJ8Zi2CTsyGyCkFd4CzjvLD/giGwcT0PvvRZ/I0CYFnKtTH8m+SB1 cQGEs3bjLOjV0GMSt4eKIQRzWUG9jcSk2BPY8rsKNKVJh2kjETZfnGLeIgqTwnWy BV+O5RggAqBhwX5U7M/oZJ4mSe0FB0Tqb5Newvj8XtG6w6si+te07v26/O8PSrPs BznWiuz14eVQJo7hko4ESgtQpIeX7Xf+VgJn/yXYm8d+sL6W7rkrALltP1nlZ4ij pX9PLlMqj5GK1rTmo1+ZI5MCAwEAAQ== -----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 303385471086887154662933607071769437011306 . . . . . . . . [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 2019-07-12 09:55:13 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-10-10 09:55:13 +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 771545710109724249574192179053184624692733807398824081937226032125522823895619182304484683992716599501682185725426602135318957783721828755389293022793980558446045189057203287265508707252217552357890450482507573223369913792367168239081518886610859243720618450724783384597829364521879696200985968940887033506402767320981884249859388140285685003943992113244905564383147752750887295451560086707184794752097338660353703889828455624258986141499027090111937196461921302333598075839092492972275869699102969644654243704156671565870343157058397562926611329076003763637070860953002309792624353529195916762771289269014899120951593291983832852611699953437488444449117736080161250518175989162512877029774257852990457987429176691660782435506057804721298944131207751524594141906239827222831516054081725189278897998731199116814676986450394521304908118749830344253781813424475614416816322582000198181932901405543678005922167000090298028051572760650222374109191418623610508566537605836864737370359824269218182394873914140687727000019143087807754968662961356462344365634571309141325290688492801206966024564267734457575407504498775955761454035992148733225444662624144013942864152914274941667972079097611825525109303183599629897727111444556901673768395667 . . . . . . . . . . . . . . . . . . . . [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) c43e8b20da7b60e9ecf7b3b91c9fedd4079db8b6 . . . . . . . . . . . . . . . . [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) 00f0007500293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016be5d29bf9000004030046304402205901caca26265351866683f598d3edbc564510cc6168a58114356db85209b756022060885c8f584a359ab53742f38f7cf005a84ebbb291716e9019681e735778fec80077006f5376ac31f03119d89900a45115ff77151c11d902c10029068db2089a37d9130000016be5d29dbf0000040300483046022100e3e1279067c00b9326b1bb97b49b00458ce95abe47f378aa2c53507833c516a7022100f7df639e42ae6e32f7ff507e70b483deaf7a1e7aacd325ba9aa85864258ba528 . . . . [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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