aquaizoling.sk
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:99:c5:0a:be:72:44:a0:3c:71:bc:3b:e2:92:07:77:bc:f7 was issued on by Let's Encrypt.
With 2 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=aquaizoling.sk
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:99:c5:0a:be:72:44:a0:3c:71:bc:3b:e2:92:07:77:bc:f7Serial Number (int): 313661973635033612539688888317807502540023
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 57:d8:19:08:1d:ce:99:96:cf:76:2e:66:3f:d2:80:0b:89:01:04:f6
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 39:82:99:32:0f:4b:08:aa:c4:4b:81:7d:76:a7:87:8f:72:06:57:c2
Fingerprint (sha256): 30:ee:e4:30:5d:9f:27:94:5b:81:1c:58:e9:f5:f8:86:5c:87:e3:c3:06:0a:61:a1:6d:45:1a:08:94:1f:51:18
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 aquaizoling.sk
2
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for aquaizoling.sk
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
8 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
aquaizoling.sk
www.aquaizoling.sk
www.aquaizoling.sk
Other certificates including the domain name aquaizoling.sk
(limited to 100 certificates)
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.mail.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.mail.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
aquaizoling.sk
www.aquaizoling.sk
Certificate
The complete raw certificate details for aquaizoling.sk in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGFDCCBPygAwIBAgISA5nFCr5yRKA8cbw74pIHd7z3MA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xNzAzMTUyMzQyMDBaFw0x NzA2MTMyMzQyMDBaMBkxFzAVBgNVBAMTDmFxdWFpem9saW5nLnNrMIICIjANBgkq hkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAzNAu9AKiXjT11pgJJGRbEoZegDH7+/zy 3DrPO6WR4KXIbN73pNVCM2UbnZJXEQiCsg6kyKyCg+slDXNVUl1Rs017uzynDbLg 4X361JCWgBwAAWoJxtF6onCxOdKm8r6x5KdYb2l1kyQfrS2DvorWN7ndT34WjvRG eDtJWIufnRH9e/j6zniQ4qiXaRxGjmhBuZq9eQycd5H0LBpsD/Gm6VniJs3xdmth n+6uruwsw60ssqCQ/1cjcsA4KxkwZEwrPm5H28WbBvbwKou3DDrrMeWemGfaM31B G5ePs7G1AWGMksmT91VLvpc+sa5aVFUkclCzOrLrGuRe/16dPINKzKdMaxmQnF8z i3INTxQRP0sDqLzvvzGH/OeGcfGjn2V7CccVnlNhsZPrarzM6DFEVW4kvFqz+YA6 rUgiPjxqXV0nYdEFSTGVTP1INiAsytadYuQx3MhsUHyZGbkKB3qkiDHcB8LoCN7y rvWqFDZGOtlp64DcoEK5MsQXlKqOioDgONpjn5MTkFOCPb3ErDSK8FW+v7+pL4T/ 2msqOX4i3bOfKQiyLX7yBpzJ/ac3ZXfIBacGaaW7NZd/r4MikoQWN7cRU4n/6K8N YRmgySfHRHfZXiYutl/2X5urM4hVxl750HnNOd2Q1rDGB5bfhMWGPBBo4LMAg1ef 4I7Q6v3GtWkCAwEAAaOCAiMwggIfMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAU BggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUV9gZ CB3OmZbPdi5mP9KAC4kBBPYwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo 7KEwcAYIKwYBBQUHAQEEZDBiMC8GCCsGAQUFBzABhiNodHRwOi8vb2NzcC5pbnQt eDMubGV0c2VuY3J5cHQub3JnLzAvBggrBgEFBQcwAoYjaHR0cDovL2NlcnQuaW50 LXgzLmxldHNlbmNyeXB0Lm9yZy8wLQYDVR0RBCYwJIIOYXF1YWl6b2xpbmcuc2uC End3dy5hcXVhaXpvbGluZy5zazCB/gYDVR0gBIH2MIHzMAgGBmeBDAECATCB5gYL KwYBBAGC3xMBAQEwgdYwJgYIKwYBBQUHAgEWGmh0dHA6Ly9jcHMubGV0c2VuY3J5 cHQub3JnMIGrBggrBgEFBQcCAjCBngyBm1RoaXMgQ2VydGlmaWNhdGUgbWF5IG9u bHkgYmUgcmVsaWVkIHVwb24gYnkgUmVseWluZyBQYXJ0aWVzIGFuZCBvbmx5IGlu IGFjY29yZGFuY2Ugd2l0aCB0aGUgQ2VydGlmaWNhdGUgUG9saWN5IGZvdW5kIGF0 IGh0dHBzOi8vbGV0c2VuY3J5cHQub3JnL3JlcG9zaXRvcnkvMA0GCSqGSIb3DQEB CwUAA4IBAQCFTAxOgltbQGRJ8rIt38fupzBXPLy7LmsuV85dlW24I8yyHDkre01U mFBevton1nwLXid3gdSuUzlo5dzGozmdDEMMsj0DG+/NIC1ze4xWVbjIGA6pECNR 60i7QZspaEzWdavCLc+WxWxwK9kcczR4Dsgv0qpm0mMJnadjTrdpRayIBUytoj/O 26gx+AAUmzkKeB3cHJK1mPSZ5KTv8RMQGjcTBUm5+1Cf/XX+XBeWzXdDROqJjt/o 09Nq+wHrk97nFYtlayXZqdaQEQpvA6e3ymJfIHdAqZBnV/Eb5dZvi31tEYzo9snA SDzNGI86nTrEXxV55BppfeN9SDlkwrVb -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAzNAu9AKiXjT11pgJJGRb EoZegDH7+/zy3DrPO6WR4KXIbN73pNVCM2UbnZJXEQiCsg6kyKyCg+slDXNVUl1R s017uzynDbLg4X361JCWgBwAAWoJxtF6onCxOdKm8r6x5KdYb2l1kyQfrS2DvorW N7ndT34WjvRGeDtJWIufnRH9e/j6zniQ4qiXaRxGjmhBuZq9eQycd5H0LBpsD/Gm 6VniJs3xdmthn+6uruwsw60ssqCQ/1cjcsA4KxkwZEwrPm5H28WbBvbwKou3DDrr MeWemGfaM31BG5ePs7G1AWGMksmT91VLvpc+sa5aVFUkclCzOrLrGuRe/16dPINK zKdMaxmQnF8zi3INTxQRP0sDqLzvvzGH/OeGcfGjn2V7CccVnlNhsZPrarzM6DFE VW4kvFqz+YA6rUgiPjxqXV0nYdEFSTGVTP1INiAsytadYuQx3MhsUHyZGbkKB3qk iDHcB8LoCN7yrvWqFDZGOtlp64DcoEK5MsQXlKqOioDgONpjn5MTkFOCPb3ErDSK 8FW+v7+pL4T/2msqOX4i3bOfKQiyLX7yBpzJ/ac3ZXfIBacGaaW7NZd/r4MikoQW N7cRU4n/6K8NYRmgySfHRHfZXiYutl/2X5urM4hVxl750HnNOd2Q1rDGB5bfhMWG PBBo4LMAg1ef4I7Q6v3GtWkCAwEAAQ== -----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 313661973635033612539688888317807502540023 . . . . . . . . [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 2017-03-15 23:42:00 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2017-06-13 23:42:00 +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 'aquaizoling.sk' . . . . . . . . [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 835565023536014963959140157139972354237683939191376941396086779448719410824664352780585127775335032533011982424509842174641998737886864750082751719797394140778430880627311361523533487992271452781397435392659496385040666641371654098067831607287759915988404915839523588015057815624168599230507752419473128918347307309563310027934436503759888353017762579114384735495745362610806703826774289082528552361317037280128122281743147494755332531012299866597614196858376987472872645581612958996795256868266571930432613182759684593797327202061993518074679083248183633608645668546111005936022784309303395674634343296500936351003830445555661973302049906347844560677791083099687451732551688309596363587741662643253444015752279806427806685344091112275495538783798767342250704579291644127084215884972327881832759401170739228767291240765422530899430743249816715578258914253436548162414291503991645485702815522361950913589428262198445371964698387912518631511082241431275494867919626741251610194119818120418235091013689830358833318718315411648556816179831150949160518443878618057409771488981585768562037884037091881399406958200815478207420145845347318312651445933511682105616367838051334734487779518421550504865776097147434010208826845270518449782044009 . . . . . . . . . . . . . . . . . . . . [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) 57d819081dce9996cf762e663fd2800b890104f6 . . . . . . . . . . . . . . . . [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 (100 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 (38 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'aquaizoling.sk' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.aquaizoling.sk' . . . . . . . . . . . . . . . . [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 1.2.840.113549.1.1.11 (sha256WithRSAEncryption) . . . . . . . . [c:0|t:5|false] NULL . . . . [c:0|t:3|false] BIT STRING (2048 bits) 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