41948.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:be:09:fc:15:07:93:ed:8f:86:79:80:07:3e:dd:b9:db:78 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=41948.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:be:09:fc:15:07:93:ed:8f:86:79:80:07:3e:dd:b9:db:78
Serial Number (int): 326003779447560443321258339288394009009016
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 9c:f2:f8:88:cb:11:80:3a:3d:ba:67:f8:37:7b:d7:bf:be:e1:65:de
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 6b:0b:eb:c5:4f:44:7a:b3:54:87:82:3d:74:4b:b5:57:81:ae:48:18
Fingerprint (sha256): 8a:c3:bb:bb:df:72:c6:02:ba:60:8c:20:4f:ff:f3:35:a5:24:b7:71:34:e5:1b:d3:26:94:b4:25:84:11:dc:39

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 41948.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for 41948.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

41948.com

Other certificates including the domain name 41948.com

(limited to 100 certificates)
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41948.com
41948.com
41948.com
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www.41948.com
40527.com
41948.com
www.41948.com
41948.com
www.41948.com
www.41948.com
catarand.com
43807.com
www.41948.com
www.41058.com

Certificate

The complete raw certificate details for 41948.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 326003779447560443321258339288394009009016
 . . . . . . . . [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 2019-07-27 20:18:57 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-10-25 20:18:57 +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 '41948.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 713040637924790493766543675415457810454783522444803405593455829697808278238259432772525068674005995057008176731626007524757440885874688147643017122557628649847103747284446652284902649807268422910186779553951763171287433789744573209556820050105602662335876252121411155832657612540337430584780811822872093812901247902964734822428382457993971598972350030857897703042090474506540635352281793300225704871277329878483624387816439691685034684084968880765848425167894087273658932817743904628531495628811382706893175514817624431177393438084683104245397526401983660242153636117008244827648702711537894513709915724516329903330838748165221902223569815903312853291664551006685951246379462577919173186442700419047340749689743883230020826428076223143132418464203767626974148120240647376301823853165177742836895016023176958774140020461905044700274909158323970671273900595967652865731449197088154557701137195321417767996943389697666899139039633310387426040045846109846491936707289102730944121676872364512738561866500770305045685774028951154999315596416240645257065055465082494934142879684724505597213225453275326467737928633067409645488055346018296346753981550950246589136298925422705320744555626166284438548447944259246410532777989288021535509160727
 . . . . . . . . . . . . . . . . . . . . [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)
							9cf2f888cb11803a3dba67f8377bd7bfbee165de
 . . . . . . . . . . . . . . . . [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 (13 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String '41948.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)
							00f1007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016c354d0dc7000004030047304502202582e417346e0cee5d13ec8e0f154a0d14626b7197dd78616b5249854f5c9d15022100d4ad3f68f4bf78ed3a32b08dd4050d22fee3be1c53ed4b920a2f6d53fd28687d00770063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016c354d0d7e0000040300483046022100d719a34793654e8209775889ef0159036466ed7a8396160d4845ae54e6f2dfc3022100af3f0e2ade927411dbe0fefbb0fbf6ead5716aa2811a2321bba5b09440457793
 . . . . [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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