faqdesk.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:f9:d9:52:43:ff:93:e6:08:df:9f:c0:ee:96:7a:de:9e:d4 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=faqdesk.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:f9:d9:52:43:ff:93:e6:08:df:9f:c0:ee:96:7a:de:9e:d4
Serial Number (int): 346356036781192541219623282225892395228884
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: f3:d8:98:92:c6:a6:9a:a9:62:33:58:c6:ec:b3:3f:3a:36:0d:c6:40
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 6f:9f:32:15:52:8d:93:d5:0c:90:79:b5:c3:ac:b0:ea:52:14:d0:31
Fingerprint (sha256): e3:f8:22:dd:56:82:b4:0e:e9:9e:53:04:25:3a:bf:a1:07:19:0d:18:61:03:01:40:c8:fc:fb:73:84:87:50:43

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 faqdesk.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for faqdesk.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

faqdesk.com

Other certificates including the domain name faqdesk.com

(limited to 100 certificates)
faqdesk.com
faqdesk.com
urushiolsolvent.com
www.faqdesk.com
www.galeda.com
www.jointpainlouisiana.com
www.faqdesk.com
faqdesk.com
escuchastelefonicas.com

Certificate

The complete raw certificate details for faqdesk.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 346356036781192541219623282225892395228884
 . . . . . . . . [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 2020-02-23 08:22:46 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-23 08:22:46 +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 'faqdesk.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 755810711001260495780216907147690453720157532058499454746491912530720166103682382871255405984462860640518003164719803066314921755626712851147677517921024603941526521308698162301132940636813008225440121880379990165702809121054429729569183523195677446849786014587029493995672127208117358573459267648405876746758751051073340408454482368661803816883060851282014852617636602794138604334134677142396275033537940529064627979456560729255979658162107887268605730029734887559145672322414726762337783634330411581291613550802354724707327359845899346085568075376872502006672185809682694662026631126636591645697729355295977943863359428450147021142877822553248353460054164609918847452621987917054001752573923462204051163069420919415232482010691263683227860633082741666113963601788585975269819502819120362732267129006455390219502915496712384665555104226084828088853153375646457395811131468080823930273914867754318903423144775379358541515761457943203412473687095190060439451027289603289583497046608944938124770977666644793219126049485865354061247979971300966687957898598890374889996607657319752369073934694313990210477725635353126036255974226966087386189549907716562336755586008229689124972571374693622133381933312114416115879232215960551638937684837
 . . . . . . . . . . . . . . . . . . . . [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)
							f3d89892c6a69aa9623358c6ecb33f3a360dc640
 . . . . . . . . . . . . . . . . [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 (15 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'faqdesk.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 (246 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes)
							00f10076005ea773f9df56c0e7b536487dd049e0327a919a0c84a11212841875968171455800000170715b312300000403004730450221008ed275b1dab537deaa1dafda91f39868532ec371691031c6a595c0e9dabc3999022037adb669a1c67b97a76d5b57f0c4c00da6096e693ada60046209e8f6b9947753007700b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e00000170715b311d0000040300483046022100ad574a5bc58e4c05e5d586ec8b5b3a38a5c43b518323b2fdb567dcbc92130ab50221008bb7647d6919da29df3e841fc4f17448e643c3729c84e89764b31208c8686275
 . . . . [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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