www.helpchats.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:15:4c:f3:63:0b:51:72:3a:bc:31:94:73:a6:1c:26:f9:fc 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=www.helpchats.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:15:4c:f3:63:0b:51:72:3a:bc:31:94:73:a6:1c:26:f9:fc
Serial Number (int): 355697358497052238818560948215845076007420
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 84:75:7a:cc:89:eb:63:1a:54:4b:a0:6d:b9:9b:1e:ed:fa:9a:38:eb
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): b9:f3:fb:76:6e:3e:d7:9c:b0:53:2c:dd:a7:ed:1c:6c:75:ad:db:82
Fingerprint (sha256): 43:0f:88:67:e9:92:38:5c:19:6e:95:64:cd:04:e8:f2:d6:17:0c:20:91:55:c8:5c:50:d9:dc:ac:c3:c8:69:c7

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 www.helpchats.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.helpchats.com

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

www.helpchats.com

Other certificates including the domain name helpchats.com

(limited to 100 certificates)
helpchats.com
helpchats.com
www.helpchats.com
yorkpop.com
www.helpchats.com
www.helpchats.com
helpchats.com
helpchats.com

Certificate

The complete raw certificate details for www.helpchats.com 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 355697358497052238818560948215845076007420
 . . . . . . . . [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 2019-11-12 16:55:57 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-02-10 16:55:57 +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 'www.helpchats.com'
 . . . . . . . . [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 794746316126482253532184475147623601192729358070393788133687299290845763061892887615495536281661396472140391529428069081567727294295633403042897585640325213173542398813612381240222858948092042198595007475732770433911094112537564840355505602646805637122238937665618493414317143275258294699667542780632969510468208679053713836879632448665177574931549380296778390621877612218961589376150276503930125678244755789630459461705378382436945915403678863969983670017716333342864230081870487430737208013192190878154727633728440516888703260084123375559028288516242560065753014049651271528919233368025612178604631954507134620897353948333219670824075908585804943054174094922299132559336817273303644734914507888273408430467823241654409337220754447137141769219620410267110275066530380307544481770416010008532017194978918853817329943914339645037032124165259188700159578271746519652123408540904850440294767391051954764345543776453847271885592870138005966158626859200330384310284747387456190574753094407063472338046188502812719710311784228587570551005519153287413990657695926359676068078677671842133421574626941791819240887214934624019084843850877494304529803662039182270655556815791028039359289673888444881799602274981357222311517927511850109148566251
 . . . . . . . . . . . . . . . . . . . . [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)
							84757acc89eb631a544ba06db99b1eedfa9a38eb
 . . . . . . . . . . . . . . . . [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 (21 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.helpchats.com'
 . . . . . . . . . . . . . . . . [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 (247 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (244 bytes)
							00f2007700f095a459f200d18240102d2f93888ead4bfe1d47e399e1d034a6b0a8aa8eb2730000016e60c2028d000004030048304602210086ac8fe331bb59b5696e93e5f2f446c2c35e2266ee29b9a8c666d72a6368c48f022100d537ed4c41c2c2b313f1691bc02657f9435a776ec61c7f590b278cb6bdd02701007700b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e0000016e60c202800000040300483046022100eb5549612cf63e83f9c40ec1832adaac89d286b2904b54c6d6065efa4bfe62fc022100a2d31ae022bf095b29e2aaf99a171391b8a940be309e51c28cf2348e3fb789a8
 . . . . [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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