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:c7:64:89
Serial 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.org

Check 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-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----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-----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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