openstudy.club

Issued by R3

About this certificate

This digital certificate with serial number 03:86:7a:05:3a:0a:70:3b:bb:1e:c6:37:b6:06:17:40:79:7b was issued on by Let's Encrypt.

This certificate is currently not expired, we haven't checked the revocation status of this certificate but you can do this simply on revocationcheck.com. 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:
  • DV certificate contains a subject common name, this is not recommended. If certificate policy 2.23.140.1.2.1 (CA/B BR domain validated) is included, only country and/or common name is allowed in SubjectDN. (BRs: 7.1.2.7.2)
  • Subscriber certificates use of Subject Key Identifier is NOT RECOMMENDED (BRs v2: 7.1.2.7.6)
  • Subscriber Certificate: commonName is NOT RECOMMENDED. (BRs: 7.1.2.7.1)

Certificate Subject

CN=openstudy.club

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate will expire on

Certificate Details

Serial Number (hex): 03:86:7a:05:3a:0a:70:3b:bb:1e:c6:37:b6:06:17:40:79:7b
Serial Number (int): 307096887916863319622909396596700718594427
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 1b:de:7d:f1:b3:eb:d6:78:d1:48:f0:f8:80:97:d8:14:46:4b:96:44
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6

Fingerprint (sha1): 91:66:31:3b:8f:44:8d:1a:e8:d6:a2:7a:40:14:5a:06:bc:ab:68:9e
Fingerprint (sha256): e7:d3:2e:d5:50:7c:c8:98:55:b8:03:1e:54:d0:78:46:89:df:3f:be:23:cd:f7:aa:93:5d:1e:5d:43:a3:3b:c9

Issuing Certificate URL: http://r3.i.lencr.org/

Revocation information

OCSP Server: http://r3.o.lencr.org

Check the revocation status for certificate openstudy.club

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for openstudy.club

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

openstudy.club

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Certificate

The complete raw certificate details for openstudy.club in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5t4H5ZDSe5WdMW0jstVw
xNmd14tn/Bw+ASLlKqLFiBc+T0VVnSMFj+PreChiAuS/kvfpq60FEossCXKkMp9L
CvdHWVxjnGIIVHQ8SkFaPRcXG/a4lsia2yF5+rqaffUMvineCRI1G4NqqD6hJIdT
6oXJnY+lkvgUlJ3qU7ZxuqBPbeSiYdlSx2h6GmxwSafnoRGR/bV3+hieSrzggXrb
XiF8gV2WnM0V0JOdnVvwUW9OSZzink7b0YPrVQ0Ei3uFNGflEekuPYz5UsEi37WX
PHBN1GimdkjGSOwNYj+156cTm5Mws0q+5XABHQnY4az9SewIFo4Yju4mBnCQF5Ws
SQIDAQAB
-----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 307096887916863319622909396596700718594427
 . . . . . . . . [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 'R3'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-04-25 19:11:25 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2024-07-24 19:11:24 +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 'openstudy.club'
 . . . . . . . . [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 29144297633328697163341616382637569324355388172655760457824207417155235609620274908465069803067487911884346187033933215229044879203806095460284580367531734720327426411256910516101658472646052692340382453514892064104174168058430834140552932031738722835544115288468498304970958038370474457954513106465041788761791702479105828679653476163242919790039649708007967364566635694701298660568219625236730840219864629870589701372352734342402393460731449240988390403912871900628121330497403384096882520597834342632547619808805663341267275907492878206331683275977342651499606142453829426371197213201898600588200829392495505157193
 . . . . . . . . . . . . . . . . . . . . [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)
							1bde7df1b3ebd678d148f0f88097d814464b9644
 . . . . . . . . . . . . . . . . [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 142eb317b75856cbae500940e61faf9d8b14c2c6
 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 'openstudy.club'
 . . . . . . . . . . . . . . . . [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 (12 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 1.3.6.1.4.1.11129.2.4.2
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f100770048b0e36bdaa647340fe56a02fa9d30eb1c5201cb56dd2c81d9bbbfab39d884730000018f16e2603a0000040300483046022100cc96f2bfe0b2a139a25cf0f116ba8d5b92788ea46d33df560b23612966ea5c21022100de8af8a350a28c682f33bc54c2bb60c9476db1ccac6814fa572c565c223b9554007600eecdd064d5db1acec55cb79db4cd13a23287467cbcecdec351485946711fb59b0000018f16e2603100000403004730450220425a297b8cdb0b0c821d396848b201d5d46cd20ad27d6d8de8b6088ff0d69dad022100a51c8c6a18ed4a0bda677f23c4b7f5da7752a49ecb6d1dcc890cbadfd5340738
 . . . . [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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