*.alfarisgrp.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:cf:3a:0a:28:f5:ac:92:af:ee:94:19:b7:c2:d1:00:7a:cf was issued on by Let's Encrypt.

With 10 subject alternative names this certificate can be used to secure multiple fqdn's. 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=*.alfarisgrp.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:cf:3a:0a:28:f5:ac:92:af:ee:94:19:b7:c2:d1:00:7a:cf
Serial Number (int): 331852455725399805063430594470992221862607
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 0e:b4:dc:00:33:d8:bc:58:b3:f0:9f:e8:ad:be:d6:f2:98:3a:00:4e
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 3f:da:cb:b1:a4:9d:df:48:8d:ea:20:8f:8c:6a:8a:30:92:00:46:ca
Fingerprint (sha256): 98:04:c0:60:95:07:5e:68:a3:b3:f0:97:77:bd:cb:14:fe:3a:25:5a:40:bb:85:26:4c:27:93:a2:f6:e2:e2:c3

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 *.alfarisgrp.com

10

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for *.alfarisgrp.com

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

*.alfarisgrp.com
alfarisgrp.com
alfarispapermill.com.sa
alfarispapermill.sa
alfarisrentacar.sa
fpm.com.sa
www.alfarispapermill.com.sa
www.alfarispapermill.sa
www.alfarisrentacar.sa
www.fpm.com.sa

Other certificates including the domain name alfarisgrp.com

(limited to 100 certificates)

Certificate

The complete raw certificate details for *.alfarisgrp.com in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6dFuX0F1d2GG/UX2e5TT
j3JpgEoVXTleVT+fGKkPExrv4OEH19J1mS9oBBmTVo51VS275fgqyX5KfX+SSfgP
xjbKK3R9HddP+Vhs1j947BoPnaZoWJpvR8ETFGiG1sUnuAlAK6HOl2utzDPHNCtz
wiJy8yPLfDkEcyeMo5Gpo9oqMZ6IUsoZGdv0vPgnKPbHVct6e7bOb8EF8AWxSpNa
YOxK6iB9jAjSj7OUdFn4XS9tlUOJgvyQ3Pfb7Hg3M+ELKm+jOOoZC8HY5/X0MYO5
XiUwD6hyWj7TTMoCblNICD5eNP2/Onp6lKUhciJDic4lc1DdLhs0r/A2r25sXcG9
KQIDAQAB
-----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 331852455725399805063430594470992221862607
 . . . . . . . . [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 2019-02-07 17:34:57 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-05-08 17:34:57 +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:12|false] UTF8String '*.alfarisgrp.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 (2160 bits)
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 29516799401799696574705342028158093871939478642750620676193796609716579574647047419847762748513255449487792749607348338399285509433429547548023004356337011596881718079256025426703740002571947424964947744342057554324180058859621170874037158425283457872015031575134017060789663379475078241694488801732026657056086434660362682016658799617033925432462706983323465191122024295935294741521506303262563488199822170505830500094861152466308550287842628769307055752304403801027844585398216398074613417484751394562965789877676211679521591247624056145618242233446634845143022059713348600504905801888375092608523770219366921125161
 . . . . . . . . . . . . . . . . . . . . [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)
							0eb4dc0033d8bc58b3f09fe8adbed6f2983a004e
 . . . . . . . . . . . . . . . . [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 (209 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '*.alfarisgrp.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'alfarisgrp.com'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'alfarispapermill.com.sa'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'alfarispapermill.sa'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'alfarisrentacar.sa'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'fpm.com.sa'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.alfarispapermill.com.sa'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.alfarispapermill.sa'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.alfarisrentacar.sa'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.fpm.com.sa'
 . . . . . . . . . . . . . . . . [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 (244 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (241 bytes)
							00ef007500e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe00000168c93dcd6e00000403004630440220025d5ef7876c7cd9a7288582d70e3a76f0a749578231c94e3dca28eada531ed802202e3061be797374cbe2b5000f23bddd2f2b5285446685b36325d543687df7ffb4007600293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000168c93dcfae0000040300473045022100de70bc3aa2ba40abe315248ee5718619d76b86e013a55bee2e1c75125f747bcd02201c3deeb6ce5ee52b564b0d71c219726837f986eb020630125301d2212a5f9b27
 . . . . [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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