farzibaba.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 04:85:b8:cd:eb:09:2e:70:9f:5e:06:e8:7e:f4:b2:45:5e:7f 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=farzibaba.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 04:85:b8:cd:eb:09:2e:70:9f:5e:06:e8:7e:f4:b2:45:5e:7f
Serial Number (int): 393952345666699909170907839933520288243327
Serial Number lenght: 139 bits, 18 octets

SubjectKeyId: 8f:4a:62:ed:9a:fa:73:f3:15:68:d6:78:5a:05:60:36:47:1f:77:e2
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): cd:a0:b9:fa:0a:63:75:f7:85:b5:41:a4:83:e4:cc:08:be:cb:80:d0
Fingerprint (sha256): 7f:21:68:c5:bb:12:3d:62:e9:9b:f5:51:ba:5b:12:7f:15:6b:34:b5:1d:14:d4:7b:57:0b:84:69:e8:5e:49:d0

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 farzibaba.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for farzibaba.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

farzibaba.com

Other certificates including the domain name farzibaba.com

(limited to 100 certificates)
farzibaba.com
farzibaba.com
farzibaba.com
farzibaba.com
farzibaba.com
www.farzibaba.com
farzibaba.com
farzibaba.com
farzibaba.com

Certificate

The complete raw certificate details for farzibaba.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 393952345666699909170907839933520288243327
 . . . . . . . . [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 2018-12-25 05:01:57 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-03-25 05:01:57 +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 'farzibaba.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 689293394077855470730911192817708347797392098787128888869585516022165658357215846832149489301893183012601459399313984772561112557169546623621814924806614388444158710243541454623801940660744972033151796324456839152241150670933399946310205277596965894966745386085069783926613633619829719706864476316755808712024417383256083899323025831339537623514072106272447763589182844644967579320367370862264478687117908436721535990658871270172697946922226218978434424329416724073289787417489625425729855334354438218965949556510587098912136614940038845273382356869492270004220715476692492989728565161597964283585912297203673003051317341051144450912314042397161271574388762637856198609738944712368223190053276609396700866861283124530276749355750113033710383899433214429265294628722452018852197105034949088928549490250530473130580693953826472647872101805390759066679262191710846953766456862450722098536204060725544847544944310039396998461462608455145589626485356624017085315139803531882448785214931778450196496913674610783621858218291820721979241958639210709908670697642946863479562785296622198199086794632959513028018550267873217801527614369948758885844507196578397411206251344168000160186034316693585355873330606951571106331126638439748609343669071
 . . . . . . . . . . . . . . . . . . . . [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)
							8f4a62ed9afa73f31568d6785a056036471f77e2
 . . . . . . . . . . . . . . . . [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 (17 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'farzibaba.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 (245 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes)
							00f0007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc5600000167e3f499e600000403004730450220594f4e50f14bc2c1a7abd131f08e30da45ee25ce25a8ec5eec77b571c580fa6302210093e1a108c9e7d57d004f8f7f4509ea72f34e4f379cfc1f30584bae24f5eaae59007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000167e3f499c1000004030047304502201a7a032adce5bffa3eea8c2fbebc7a32ec70dc876182feb9ac841137beeeed46022100f071c1369afe72573d66c13d0f04f46256874b1c31749cda4e06343168990d73
 . . . . [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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