www.89190.com

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:a9:58:ae:d7:6a:e1:ac:65:09:f1:4b:b2:ee:d1:d0:6a:cb 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.89190.com

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:a9:58:ae:d7:6a:e1:ac:65:09:f1:4b:b2:ee:d1:d0:6a:cb
Serial Number (int): 318962457697387890473219266435511317719755
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 88:67:99:e0:21:b9:25:c0:a5:27:3a:97:10:f2:12:fd:ba:d9:8e:f4
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): cd:eb:ab:44:32:7d:38:b8:5a:29:fc:55:af:24:8c:c3:b1:8a:6a:de
Fingerprint (sha256): 8f:32:ba:e7:e8:5e:15:70:16:d0:da:c5:d8:16:82:f7:f5:5c:b9:81:40:75:d9:ac:ed:f4:6e:0b:75:b6:76:dd

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.89190.com

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.89190.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.89190.com

Other certificates including the domain name 89190.com

(limited to 100 certificates)
942.me
www.71610.com
89190.com
www.89190.com
89190.com
89190.com
89190.com
www.89190.com
www.89190.com
www.89190.com
89190.com
www.sellerfy.com
www.89190.com
947.me
89190.com
www.89095.com
www.driveswitzerland.ch

Certificate

The complete raw certificate details for www.89190.com in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIGUjCCBTqgAwIBAgISA6lYrtdq4axlCfFLsu7R0GrLMA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0yMDAyMDQxMDEyMTFaFw0y
MDA1MDQxMDEyMTFaMBgxFjAUBgNVBAMTDXd3dy44OTE5MC5jb20wggIiMA0GCSqG
SIb3DQEBAQUAA4ICDwAwggIKAoICAQDrguGklxQk1i5q6N7eB4nc4UHbiJFe3esE
GkLxwtEGDwy5zcWxUBjSc16LsCy8trJ73tTep4jCQF5VBU3ZulPv+Opy5HgClpb2
wM6Do4HtPFeT09ICliCkE9ScJvbzW+dHUPjyXgyPgkQElnj49e2ztV78jciG+UIC
Osi7KCXtQr1t3U142Z70E8dqdLjRcPwpzdV8ZzT7zBnJ9zbIaRPhrIGKxbknT/r4
DOuJhS2vULSCxF6O0/F9j9VOFDvMgMhjVzlSu+McaIMxa27CHP8ZTGU+1URcRluD
mSMSaboK4K9FbohToN9o0/kSn3DIguiT+qM1resglRSPEC8S2lleM+vumhGbWvT1
JyEDWayeu/8jhy344XViJDY0oGxt7gTZBbiE1sfiNfJWFlvt3C/a+FQnLbdVpE8G
5+XgMi746fUNuXTQAcu3eiBHnqLGBkoDu2jFiILq4drjgq4WBE6ZFOsdHeTvyy58
RccvgCbTHU/UOEfrIRAVfQc8f2jVjAWLlsfdc+4zReAVA/VmGNIJftE+hQDjRMdx
uHDkDwfU9i05fxk7PcfV6T9+7phCEyp0o97Q+5STMxE3FsDFLzwr2fk3i2toZZdz
oMKcN5AOSQkYDUiQi9+veDjenQyMTLn+R5OiANDwkXgaEC/LXSZh04NplTxaqMlv
BAKzeTazCQIDAQABo4ICYjCCAl4wDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQG
CCsGAQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBSIZ5ng
IbklwKUnOpcQ8hL9utmO9DAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86js
oTBvBggrBgEFBQcBAQRjMGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14
My5sZXRzZW5jcnlwdC5vcmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14
My5sZXRzZW5jcnlwdC5vcmcvMBgGA1UdEQQRMA+CDXd3dy44OTE5MC5jb20wTAYD
VR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEFBQcCARYa
aHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEEBgorBgEEAdZ5AgQCBIH1BIHy
APAAdwBep3P531bA57U2SH3QSeAyepGaDIShEhKEGHWWgXFFWAAAAXAP5oqPAAAE
AwBIMEYCIQCiom71VrUaF3s7AT/SnCFXsxVZm0Yftcep6SxiMlO5FAIhAKT0xfVB
rIH0AbUzPYUGe589yrTb6ShIVv6mBCHkwpmjAHUAsh4FzIuizYogTodm+Su5iiUg
Z2va+nDnsklTLe+LkF4AAAFwD+aKiQAABAMARjBEAiAlcDuEABfUtt42ByOnk+hp
auxh1bLPHGwjo+ZhJDn5FQIgf6GG1DP7mles3dyHMnhhV9okpsQU5B4kx6+BYxOQ
2UkwDQYJKoZIhvcNAQELBQADggEBAACgerO/CuxEYpaA7UJ7Pp9UK+Ju/kgdOCim
8q3f9r3UKGqXMQZHtmN+rw6wZibI7/XZsSjPusipl4am9yC1MzsKP+eJg7Fd83fk
GPjuDEpT8fVKC3K7VCjMA/Y7XOXsTCi9uxCygjWBC0bwCVfpYM18W33qbyF6S5W0
ghA+oq0p5GmyV4ji3CCoLhyaseJXtITpJwzzjpqzaxpGqVVwGumjpQV2X/39MeDb
+pEuleE2gqqZqbBQpsLiTrpE9idt6JKBP3paOWPpkEWZfvgxUqHIPpKgbdlYSU53
c27Qehq6EqJ8yHfJakVtbMkQ81STmjgvUdZvd2+gZkoWmY+tRK0=
-----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 318962457697387890473219266435511317719755
 . . . . . . . . [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 2020-02-04 10:12:11 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-05-04 10:12:11 +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.89190.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 960802096607070361448463046023375298673288121494845931437576596758090115194818255071260167791648729395313459584352653635313238579756621920463090955560990332051215443352214181165721141089527829955431856715258183444167094000202057072575165801974579828679403619666182765913984601148193490593177482209914958252769795975698267405836706489798091287422973743597902943618296115736651289847935586765909280175249556237686102045987356188038306595923239671860669518211560919993033042840761171905567613664469134386589185320453695857640665169510784364894512269169973059811941862377767768206338936242374941435455444988893214895148321178903822415201093396083282140719846928952355141890821826224921480983279330501903823457200558235751467535533066663843835968281388886815123523403802953930001123737401748378377049059134733891578413103888503368367332895314221987217463382143827894278713980849686282228765280330638319538909397839750499103565938414882856951895383697977191179924939445746484046303596782905778178463327642570513439068703533653600724119793230492798067832136619883317532156858825436809083376533116916660000997040003934303826211752343143121089959225287358002721868992599782616871378758269009605470062318827940974733723365201042816482376332041
 . . . . . . . . . . . . . . . . . . . . [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)
							886799e021b925c0a5273a9710f212fdbad98ef4
 . . . . . . . . . . . . . . . . [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 'www.89190.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)
							00f00077005ea773f9df56c0e7b536487dd049e0327a919a0c84a112128418759681714558000001700fe68a8f0000040300483046022100a2a26ef556b51a177b3b013fd29c2157b315599b461fb5c7a9e92c623253b914022100a4f4c5f541ac81f401b5333d85067b9f3dcab4dbe9284856fea60421e4c299a3007500b21e05cc8ba2cd8a204e8766f92bb98a2520676bdafa70e7b249532def8b905e000001700fe68a890000040300463044022025703b840017d4b6de360723a793e8696aec61d5b2cf1c6c23a3e6612439f91502207fa186d433fb9a57acdddc8732786157da24a6c414e41e24c7af81631390d949
 . . . . [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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