arcore.org

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:cb:ad:5b:92:f8:a3:32:7f:ac:f0:a7:19:1f:a6:56:ca:a7 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=arcore.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:cb:ad:5b:92:f8:a3:32:7f:ac:f0:a7:19:1f:a6:56:ca:a7
Serial Number (int): 330644610203447058680767320471636777814695
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 31:2c:2c:a5:4a:eb:50:ba:ed:7f:6f:2c:24:2c:5e:08:d1:60:16:1e
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 73:a3:dd:e8:ca:fb:65:58:14:43:41:68:f6:e0:b2:bc:13:5a:de:34
Fingerprint (sha256): 7d:65:9a:59:b2:c1:45:a4:64:3f:4c:c4:73:be:93:6a:1b:df:c0:3c:f0:f4:b4:0a:38:f4:d2:8c:b7:17:5f:3a

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 arcore.org

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for arcore.org

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

arcore.org

Other certificates including the domain name arcore.org

(limited to 100 certificates)
www.arcore.org
arcore.org
arcore.org
arcore.org
www.arcore.org
arcore.org
www.arcore.org
www.arcore.org
arcore.org
graphane.org
www.arcore.org
arcore.org
arcore.org
www.fontanafredda.org
arcore.org
vegetables.organic

Certificate

The complete raw certificate details for arcore.org 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 330644610203447058680767320471636777814695
 . . . . . . . . [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 2019-07-28 11:14:44 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-10-26 11:14:44 +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 'arcore.org'
 . . . . . . . . [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 808628036901397901792874888702960744899579171460237023999873743792850747462622116285007218791386034268661469782062848178902247004911424996153654736602833067238454772751403180338640039628789645247926896415461322794980366475899662715470478908812905467444969568369028439480705725511523094815340339579517013111664840175395357507957493947780713623689873162744485057897500841409828968248457554717461360003953733745874270425349097745382504989758424550814713501309926359296669816292795134953853867744944140307985261812788176237535170195886442417823337710643627379451854785271665359038788339173941808798698359479709350380066516094312289934566354920295860545921831528742457999781879571458823924796712876409605131553174048797199147768588788828522723621887441118650630933854252436382420296538829634866082724537791128897147897599635011195817865749960021812707497017992739708423324474673957858983220290826550371511066442385585664455150021861260498290402868783555371875034101919251689698826026934153036677394718341532368035414697051849463311502298772037314096000930831879283627096692073699510152235808042900148004497288759544133523818855386911851469057861132362085841661533185925722783827345674006810598617144497129258393819064214673500208518362549
 . . . . . . . . . . . . . . . . . . . . [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)
							312c2ca54aeb50baed7f6f2c242c5e08d160161e
 . . . . . . . . . . . . . . . . [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 (14 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'arcore.org'
 . . . . . . . . . . . . . . . . [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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f1007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016c38812a52000004030047304502202ea201fad4012155e86944d21566689dd0597858a0ecef4a204c2ee92b7e6f1d022100e83ce853627b0f516190b3484de3b802f17a77a66e1f14df41afdae30e14f96a00770063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016c3881287f0000040300483046022100b82bcd7456a200a666033791ef274fa207c387f7376c7b03f86b6ef8f3675d0402210088f378de89369c1e3de52dd2eb7cb02205a6cb7b719ad3c8fdef8b69231c22cf
 . . . . [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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