wulingkarawang.com
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 04:f9:82:92:d3:10:10:c3:26:e1:83:01:0a:c6:a5:82:9a:1b was issued on by Let's Encrypt.
With 6 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=wulingkarawang.com
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:f9:82:92:d3:10:10:c3:26:e1:83:01:0a:c6:a5:82:9a:1bSerial Number (int): 433353015086009313792219674462870241974811
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: 13:bd:e0:76:12:b1:9e:1e:4d:82:a1:26:41:8c:44:16:4f:92:e3:5d
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 9b:13:25:e3:bb:61:54:cc:8e:a8:29:85:52:2b:d3:32:86:4e:c2:e5
Fingerprint (sha256): 0b:4e:17:88:ac:18:06:4d:74:43:c1:e8:63:24:67:c4:bd:e7:29:c3:d8:60:ca:0d:66:ef:95:a7:28:be:9f:03
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate wulingkarawang.com
6
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for wulingkarawang.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
cpanel.wulingkarawang.com
mail.wulingkarawang.com
webdisk.wulingkarawang.com
webmail.wulingkarawang.com
wulingkarawang.com
www.wulingkarawang.com
mail.wulingkarawang.com
webdisk.wulingkarawang.com
webmail.wulingkarawang.com
wulingkarawang.com
www.wulingkarawang.com
Other certificates including the domain name wulingkarawang.com
(limited to 100 certificates)
Certificate
The complete raw certificate details for wulingkarawang.com in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGljCCBX6gAwIBAgISBPmCktMQEMMm4YMBCsalgpobMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODEwMjQxNjU4MjZaFw0x OTAxMjIxNjU4MjZaMB0xGzAZBgNVBAMTEnd1bGluZ2thcmF3YW5nLmNvbTCCASIw DQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAK/KMZlJtFeThi2Geu3oR2J/6e/K ebJufbVr4X0OYfAtR07M7v/qAy4DsYzvjpBGgbmlsyZZs/IUzauG1+c4hUukW3fU +z16diIX/sXl0X563xAidHMNnkNJ2AREk/28btNAsVqlub0rBv/efTIB06lut2zJ d9r6kz5R2r87WZ68cBbpwzzOzv9oHrC9sFVSCE3wOb3fyPlPxlB/zSA1LeTa3rdO YV39zRxIQVUsTfGuoB78N8mU+lYUO/05bKj0jRgr9b259JSgpgrm+pX2PurRnOJx kW0NfYW20Ko4igaPiZUXdJSxCH1ZDLQCY0tNDjPaVenyPHlKlHn8XsOArw0CAwEA AaOCA6EwggOdMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYI KwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUE73gdhKxnh5NgqEmQYxE Fk+S410wHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEwbwYIKwYBBQUH AQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMubGV0c2VuY3J5 cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0c2VuY3J5 cHQub3JnLzCBowYDVR0RBIGbMIGYghljcGFuZWwud3VsaW5na2FyYXdhbmcuY29t ghdtYWlsLnd1bGluZ2thcmF3YW5nLmNvbYIad2ViZGlzay53dWxpbmdrYXJhd2Fu Zy5jb22CGndlYm1haWwud3VsaW5na2FyYXdhbmcuY29tghJ3dWxpbmdrYXJhd2Fu Zy5jb22CFnd3dy53dWxpbmdrYXJhd2FuZy5jb20wgf4GA1UdIASB9jCB8zAIBgZn gQwBAgEwgeYGCysGAQQBgt8TAQEBMIHWMCYGCCsGAQUFBwIBFhpodHRwOi8vY3Bz LmxldHNlbmNyeXB0Lm9yZzCBqwYIKwYBBQUHAgIwgZ4MgZtUaGlzIENlcnRpZmlj YXRlIG1heSBvbmx5IGJlIHJlbGllZCB1cG9uIGJ5IFJlbHlpbmcgUGFydGllcyBh bmQgb25seSBpbiBhY2NvcmRhbmNlIHdpdGggdGhlIENlcnRpZmljYXRlIFBvbGlj eSBmb3VuZCBhdCBodHRwczovL2xldHNlbmNyeXB0Lm9yZy9yZXBvc2l0b3J5LzCC AQQGCisGAQQB1nkCBAIEgfUEgfIA8AB2AOJpS64m6OlACeiGG7Y7g9Q+5/50iPuk jyiTAZ3d8dv+AAABZqc6SJAAAAQDAEcwRQIgXkQYhT2LGh+w7vkCL66vNPx/drBq tRr461ztZf6Yv+YCIQCzj7NJ/KYHhLtzd1I0yT/xLkg6UxtX+JocNuQsUJM0IAB2 AGPy283oO8wszwtyhCdXazOkjWF3j711pjixx2hUS9iNAAABZqc6SIUAAAQDAEcw RQIgDzwL4uwmOh7HgHuSeux37QcBKyUsnL2GziSsZY417PICIQDnR5S+43SNI1Jd K8VBzPWdzkP3BX9h25g5NzRTS8N8kDANBgkqhkiG9w0BAQsFAAOCAQEAT++21LAB v5amk5v7LL2cWa5B3ErxY45ZMGKhKa0hZPb3chkgMU4PQYq2q9mJ/pURJ77sMju1 o7FtX5ZaB/ulvB5eXhVkDayZ/3NMZFC+yOuR7l4+c91Gq3ZSy4SWxZ6RXawlBpi4 FC/XtKCP90VF74Y5dA7Bpeicd2b7ZHFeWDpXxxFiSfSKCV3m7jOSnebCyOrYNiOC kOxCRUmQD6kmtYZqHqBo1qb7tYy2K47d9BleOdfONqIvDYivcIEeHPQHmP29ZmK9 1o8kNzrMsWudCKrGwQrxJA06mAUN1lnIbz8EgCh1MAr0r6JTS0WOz3dA/GnLGvcf TDwBp7fHkReaSw== -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr8oxmUm0V5OGLYZ67ehH Yn/p78p5sm59tWvhfQ5h8C1HTszu/+oDLgOxjO+OkEaBuaWzJlmz8hTNq4bX5ziF S6Rbd9T7PXp2Ihf+xeXRfnrfECJ0cw2eQ0nYBEST/bxu00CxWqW5vSsG/959MgHT qW63bMl32vqTPlHavztZnrxwFunDPM7O/2gesL2wVVIITfA5vd/I+U/GUH/NIDUt 5Nret05hXf3NHEhBVSxN8a6gHvw3yZT6VhQ7/TlsqPSNGCv1vbn0lKCmCub6lfY+ 6tGc4nGRbQ19hbbQqjiKBo+JlRd0lLEIfVkMtAJjS00OM9pV6fI8eUqUefxew4Cv DQIDAQAB -----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 433353015086009313792219674462870241974811 . . . . . . . . [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 2018-10-24 16:58:26 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-01-22 16:58:26 +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 'wulingkarawang.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 22191408820910125604556513606006254295141063443344644462328964316442493681428192690937790789507983302329852333677643344004917731534775659987618641859146653541352551097279308249280734072644379880468532960389702196239285312099954436634502412735240357707621280597958159225567706753927951061026722491781580797484433770147914063818903928878327784003156792927321388550166951910227723245385706111388820092360546466179012758485011736702085925605257782405050703304458287465664355877489207007162879337396390413663773335512995104582213231215895882365782327865253788362748059756266605623553708928664206253505930532522015812792077 . . . . . . . . . . . . . . . . . . . . [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) 13bde07612b19e1e4d82a126418c44164f92e35d . . . . . . . . . . . . . . . . [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 (155 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.wulingkarawang.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.wulingkarawang.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.wulingkarawang.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.wulingkarawang.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'wulingkarawang.com' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.wulingkarawang.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 (246 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 1.3.6.1.5.5.7.2.2 (unotice) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:12|false] UTF8String 'This Certificate may only be relied upon by Relying Parties and only in accordance with the Certificate Policy found at https://letsencrypt.org/repository/' . . . . . . . . . . . . . . . . [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) 00f0007600e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe00000166a73a4890000004030047304502205e4418853d8b1a1fb0eef9022faeaf34fc7f76b06ab51af8eb5ced65fe98bfe6022100b38fb349fca60784bb73775234c93ff12e483a531b57f89a1c36e42c5093342000760063f2dbcde83bcc2ccf0b728427576b33a48d61778fbd75a638b1c768544bd88d00000166a73a4885000004030047304502200f3c0be2ec263a1ec7807b927aec77ed07012b252c9cbd86ce24ac658e35ecf2022100e74794bee3748d23525d2bc541ccf59dce43f7057f61db98393734534bc37c90 . . . . [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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