www.96.org

Issued by Let's Encrypt Authority X3

About this certificate

This digital certificate with serial number 03:84:e2:51:98:d7:1c:93:eb:a5:8c:ec:80:ac:15:fa:78:f7 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.96.org

Let's Encrypt

Organization: Let's Encrypt
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 03:84:e2:51:98:d7:1c:93:eb:a5:8c:ec:80:ac:15:fa:78:f7
Serial Number (int): 306554959431906708526152526968689641814263
Serial Number lenght: 138 bits, 18 octets

SubjectKeyId: 9a:31:83:10:a5:8d:67:0c:4e:cd:8b:76:2d:e8:8e:21:a2:38:fc:f0
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1

Fingerprint (sha1): 90:19:42:ca:9c:2e:d6:82:95:39:d0:ec:d5:17:ae:2a:61:52:61:6e
Fingerprint (sha256): c2:9e:84:07:c5:a9:ea:3c:ea:46:36:f5:04:d4:73:b9:53:fc:34:aa:5d:50:db:3e:98:90:20:08:16:e7:9b:e3

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.96.org

1

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for www.96.org

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.96.org

Other certificates including the domain name 96.org

(limited to 100 certificates)
96.org
96.org
www.96.org
96.org
www.96.org
www.96.org
96.org
96.org
96.org
www.96.org
96.org
simatc.com
www.96.org
96.org
www.96.org
96.org
96.org
96.org

Certificate

The complete raw certificate details for www.96.org in PEM and ASN.1 format.

Certificate (PEM)

-----BEGIN CERTIFICATE-----
MIIGTDCCBTSgAwIBAgISA4TiUZjXHJPrpYzsgKwV+nj3MA0GCSqGSIb3DQEBCwUA
MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD
ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA1MzExMDE2MjlaFw0x
OTA4MjkxMDE2MjlaMBUxEzARBgNVBAMTCnd3dy45Ni5vcmcwggIiMA0GCSqGSIb3
DQEBAQUAA4ICDwAwggIKAoICAQCnDJZlnUNlGN6uYn2CF3BNgFVS2jMp/m2oZvyF
3o0a6+VJ6aHzLk4h03Zp3Zz85TO0tw6ZyEu4imlwknZayeD5JLGxaLpTJlCcxIjy
X/LxzW0ATxvgpVoWrDkn/Vv08drIzyuTYuIMMsILpqCTyruyWEbkgJV0OU4nIAog
BfWOCz8SkfuBHW+i9Dtrl37924SY+pxIEz8sogAZ+YBkXq7LnbCDVfd/IE1b4p+n
7xZjdjKCyrEpUDitTEtcxwWVkCLLrpFcBXDqrIE/FpVPKlKKO3PMCA6zF+dRNhaF
iZC33exbkzvNwzUB0a7ZeQbSfowlV93bL+Lsom1YWqDihG6vY73lJSeDyP8bpWJy
P8+z4Wp39aV70BDgYGCFLva8mD99XbAOSnolWZTgDI2RaB25et4jmdezT/C3WnlT
2bgReFzHd+dhUWumK8K1TFKyOSn3MZJwnGor8bV/ppfpo08jqkaCkTrOvprV134a
W9v6Wmm2XY3xk5DVT7U2IFR3WmFvV4rVBzFXmr3rvQBTKiUQ4jlJItmWt9jIJv9M
7YsD+j5a+rMEGsqqFaaFkw+2z0pjIKbdJM4MczE9zac31QSKwc+WWlFb7eadeJIV
X01eTMQK+4nyQCRiug/LEvRJ2+sL4mRkdKBTtfO8I3xYvbkoFpDvLxKoVme83rsh
y+ysxwIDAQABo4ICXzCCAlswDgYDVR0PAQH/BAQDAgWgMB0GA1UdJQQWMBQGCCsG
AQUFBwMBBggrBgEFBQcDAjAMBgNVHRMBAf8EAjAAMB0GA1UdDgQWBBSaMYMQpY1n
DE7Ni3Yt6I4hojj88DAfBgNVHSMEGDAWgBSoSmpjBH3duubRObemRWXv86jsoTBv
BggrBgEFBQcBAQRjMGEwLgYIKwYBBQUHMAGGImh0dHA6Ly9vY3NwLmludC14My5s
ZXRzZW5jcnlwdC5vcmcwLwYIKwYBBQUHMAKGI2h0dHA6Ly9jZXJ0LmludC14My5s
ZXRzZW5jcnlwdC5vcmcvMBUGA1UdEQQOMAyCCnd3dy45Ni5vcmcwTAYDVR0gBEUw
QzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEFBQcCARYaaHR0cDov
L2Nwcy5sZXRzZW5jcnlwdC5vcmcwggEEBgorBgEEAdZ5AgQCBIH1BIHyAPAAdgB0
ftqDMa0zEJEhnM4lT0Jwwr/9XkIgCMY3NXnmEHvMVgAAAWsNmvvYAAAEAwBHMEUC
IQC8rWD91JjWccHXjewn1oWFnznD6jg/Ri1Nn27ZenxRygIgSyLaZ12JvHWUWuTY
CuIAazTNmODQ+ZffdG2CzFIn5dMAdgBj8tvN6DvMLM8LcoQnV2szpI1hd4+9daY4
scdoVEvYjQAAAWsNmvv2AAAEAwBHMEUCIC/rPeu8yyAW4LQf2TA38DrBNm8UbPlG
puhPZs95jkJeAiEArJ7ybcltI4D1XIWdiaOjxSccnqG9cnbVUXMKB7ZXmwYwDQYJ
KoZIhvcNAQELBQADggEBAEj0OQY97EWLjhv+9Jq9H5MjKEutevi1eCNpjXvwHsKY
zUIRrZvM9VvsKNm8rHzQqJaA4vA893o4ytT7uIkyLWZIi6w9Eyjqiy7bqSP/WNht
oCluBqoOwcUnM+bSWXjllWsGtMetBPc8KWCWigdIQ9q63oQP4BDWzql0GV65fmjB
3Sjcq97adNhcI292oORp8IfJ1mF/BytzOZqNa40V26JneJcaekDn3UIOSOHd76Zo
i3fRCBMns8bKawus5MBGemqjPgtY0b4mwIasj/8rFzzM/x/ITpDEL7CNfND5aJev
Xbqlm6AWeNNe1knfC2vI4gST6eReQbTwzfJmDKIvUbo=
-----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 306554959431906708526152526968689641814263
 . . . . . . . . [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 2019-05-31 10:16:29 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-08-29 10:16:29 +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.96.org'
 . . . . . . . . [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 681501154948410581968734333125439429521995700359031238770247690214827349873307716921495448074513999222477773102036097376794208667635500224777618962354506764118749198927679847433157107736761824012492826818009236949323997109973333381686252968170313808158513481143327143900111823243142832568884163382265741574447994217766572918103992143385948014212694339020694464957499379983195547854732025615040041789103091407878869150384880797655622374452968707679819394047402493449336414917075308119143870870380643373558159900350691971435842313137544890250266706812256996768176565635120141047497503914183153336722773540615242038817413039418395232841554198126556758708189491267237717385517070976383557261992830406663439808809932510484101855514773298569627884077267329784308356834086572684720240213236210987998912330951727221552644214387685019631446544287438859076133773929699044743457142561711877812166630291037848210908302931298578328829978786864362495270834292586420254424940617585898504663252795670573412318006229383900212451014085166552049692731560192889034146432894241369072626004952365442615613531741025665112676664046675660820576146305064067270672303339384446063547564800533451758214064167635118592287655023168300433417534446695375456546106567
 . . . . . . . . . . . . . . . . . . . . [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)
							9a318310a58d670c4ecd8b762de88e21a238fcf0
 . . . . . . . . . . . . . . . . [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 (14 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.96.org'
 . . . . . . . . . . . . . . . . [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)
							00f0007600747eda8331ad331091219cce254f4270c2bffd5e422008c6373579e6107bcc560000016b0d9afbd80000040300473045022100bcad60fdd498d671c1d78dec27d685859f39c3ea383f462d4d9f6ed97a7c51ca02204b22da675d89bc75945ae4d80ae2006b34cd98e0d0f997df746d82cc5227e5d300760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d0000016b0d9afbf6000004030047304502202feb3debbccb2016e0b41fd93037f03ac1366f146cf946a6e84f66cf798e425e022100ac9ef26dc96d2380f55c859d89a3a3c5271c9ea1bd7276d551730a07b6579b06
 . . . . [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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