vidmofonica.pl

Issued by cPanel, Inc. Certification Authority

About this certificate

This digital certificate with serial number 36:82:42:f9:b3:52:d6:be:2d:fe:f4:b8:bf:1e:40:f7 was issued on by cPanel, Inc..

With 7 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=vidmofonica.pl

cPanel, Inc.

Organization: cPanel, Inc.
State / Province: TX
Locality: Houston
Country: US

This certificate has expire since

Certificate Details

Serial Number (hex): 36:82:42:f9:b3:52:d6:be:2d:fe:f4:b8:bf:1e:40:f7
Serial Number (int): 72454668786339254560434817542026838263
Serial Number lenght: 126 bits, 16 octets

SubjectKeyId: b8:70:7d:c5:25:c9:d3:2d:f8:4d:13:c7:7a:74:26:1f:2a:79:dd:df
AuthorityKeyId: 7e:03:5a:65:41:6b:a7:7e:0a:e1:b8:9d:08:ea:1d:8e:1d:6a:c7:65

Fingerprint (sha1): 2b:42:35:4a:dc:65:67:62:10:70:71:3a:e7:e4:cf:43:7a:f7:51:a9
Fingerprint (sha256): e3:2a:42:9f:d2:08:9c:39:fd:93:a0:41:ab:34:75:f4:f3:36:e6:55:34:a6:18:36:07:5c:29:03:c4:2c:02:e4

Issuing Certificate URL: http://crt.comodoca.com/cPanelIncCertificationAuthority.crt

Revocation information

OCSP Server: http://ocsp.comodoca.com
CRL Distribution Point: http://crl.comodoca.com/cPanelIncCertificationAuthority.crl

Check the revocation status for certificate vidmofonica.pl

7

DNS Names

0

Email Addresses

0

IP Addresses

Advanced Certificate Properties

Tehnical certificate details for vidmofonica.pl

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

vidmofonica.pl
autodiscover.vidmofonica.pl
mail.vidmofonica.pl
vidmofonica.kos.kylos.pl
webdisk.vidmofonica.pl
www.vidmofonica.kos.kylos.pl
www.vidmofonica.pl

Other certificates including the domain name vidmofonica.pl

(limited to 100 certificates)

Certificate

The complete raw certificate details for vidmofonica.pl in PEM and ASN.1 format.

Certificate (PEM)

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

Public Key (PEM)

-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5PLMn13Lp+rDVnfILpwI
8mHPU15uPl10Gp5S/niJWvVi5bkOToNsNn3m7I4ZAbVFy2KpwRuNkVucodcrSI2x
UZqtPgHqzHe+qNc90mHeUjPc1M0Vo0tNG7hUi7alaHkroLRV64QuHcgCqkLoqVKn
tjQmd1Q5Q/N48QgnUBe8hC2BS01F6GuWxKtovzCTap+mFZvKzQiJlvJZPNXDIXEO
WoIjiqxmwm7hXz6nCUZR9+beJS/SDZGUcuFCMga4hOKp4cpf+2+4KF7niaumiqDu
jph2BQxqBhj8B/0az9eUO/NTsVt76vOy9qtEVxgJtqUSCSeQd8W43pUpFDpqLMyt
zwIDAQAB
-----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 72454668786339254560434817542026838263
 . . . . . . . . [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 2.5.4.8 (stateOrProvinceName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'TX'
 . . . . . . . . . . . . [c:0|t:17|true] SET, SET OF 
 . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 2.5.4.7 (localityName)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:19|false] PrintableString 'Houston'
 . . . . . . . . . . . . [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 'cPanel, Inc.'
 . . . . . . . . . . . . [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 'cPanel, Inc. Certification Authority'
 . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-01-22 00:00:00 +0000 UTC
 . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-04-22 23:59:59 +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 'vidmofonica.pl'
 . . . . . . . . [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 28902062332767432958691133295703577383474982013874787077851709381400284650639958211356683896696539379074256438156840417540727802995275458545161449612325077946718391313650953038700120546946446149840510876292676719212233980103413778398856706282844245963669800250785585569957073051143896128888251723709165391319156195443820318712414969284029432386625191829762206221460699519093224462513099354953527630010181769886164160270476898462490761321584490269458297291176583833725005080023652703386042977542859237419577794672639226189158759778508217643433365215533462200479137454534984349076706589145183692653176717298832784534991
 . . . . . . . . . . . . . . . . . . . . [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 2.5.29.35 (authorityKeyIdentifier)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (24 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|false] OtherName 7e035a65416ba77e0ae1b89d08ea1d8e1d6ac765
 . . . . . . . . . . . . . . . . [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)
							b8707dc525c9d32df84d13c77a74261f2a79dddf
 . . . . . . . . . . . . . . . . [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 2.5.29.19 (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 2.5.29.37 (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 2.5.29.32 (certificatePolicies)
 . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (72 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.4.1.6449.1.2.2.52
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 'https://secure.comodo.com/CPS'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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 2.5.29.31 (cRLDistributionPoints)
 . . . . . . . . . . . . . . . . . . . . [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:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:0|true] OtherName 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://crl.comodoca.com/cPanelIncCertificationAuthority.crl'
 . . . . . . . . . . . . . . . . [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 (113 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:6|false] OBJECT IDENTIFIER 1.3.6.1.5.5.7.48.2 (caIssuers)
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:6|false] IA5String 'http://crt.comodoca.com/cPanelIncCertificationAuthority.crt'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [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.comodoca.com'
 . . . . . . . . . . . . . . . . [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 (169 bytes)
 . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF 
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'vidmofonica.pl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'autodiscover.vidmofonica.pl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.vidmofonica.pl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'vidmofonica.kos.kylos.pl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.vidmofonica.pl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.vidmofonica.kos.kylos.pl'
 . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.vidmofonica.pl'
 . . . . [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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