bioclima.com.gr
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:6b:e9:57:55:78:11:45:b9:e0:89:c4:7e:54:31:cb:c2:18 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=bioclima.com.gr
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:6b:e9:57:55:78:11:45:b9:e0:89:c4:7e:54:31:cb:c2:18Serial Number (int): 298057234642183274809775070725120170115608
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: d2:78:18:f5:6d:70:48:be:9b:da:35:e7:b2:ca:df:22:fd:89:5c:74
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): e3:f2:e6:74:04:2f:ff:88:7a:35:e9:c8:5e:38:67:20:06:18:16:a2
Fingerprint (sha256): 2d:f9:76:67:01:04:62:87:f7:f9:f7:9a:96:3d:5a:d0:67:ed:c0:16:f8:ca:a0:ad:a5:67:4e:d2:96:72:8e:83
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate bioclima.com.gr
6
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for bioclima.com.gr
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
bioclima.com.gr
cpanel.bioclima.com.gr
mail.bioclima.com.gr
webdisk.bioclima.com.gr
webmail.bioclima.com.gr
www.bioclima.com.gr
cpanel.bioclima.com.gr
mail.bioclima.com.gr
webdisk.bioclima.com.gr
webmail.bioclima.com.gr
www.bioclima.com.gr
Other certificates including the domain name bioclima.com.gr
(limited to 100 certificates)
Certificate
The complete raw certificate details for bioclima.com.gr in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGgjCCBWqgAwIBAgISA2vpV1V4EUW54InEflQxy8IYMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xODA5MTcyMTA5MjVaFw0x ODEyMTYyMTA5MjVaMBoxGDAWBgNVBAMTD2Jpb2NsaW1hLmNvbS5ncjCCASIwDQYJ KoZIhvcNAQEBBQADggEPADCCAQoCggEBALrTng66cdwhTozv5k5sFwrSwPFCAxfh RUrNGCtkhkMSbWMrT5CrXY8gJ2F3fwEJruepsf0Z/nti7Uw2fMJ8yn/bfkoghB5R A+iJ4xkESVljAv6qjY+BVsOu0kF52Pu0DaWdgJQGBSqYSEWVjgdexsxVgt6xs6Dy qvrtY1PXYEdFVmTR4FiahQ7WKCEwTCwYFWI2xWmGa52dro9/gPuatbOWAAnReFaf dQP4mtL5Cqep6SsAGGRvPP5NpOJG6ldKt6W6Z4BGl+l8mVd/VNUWzNhFGN82GB1W 4nkhcBHyyoICDHmRQ/m8b1GWhVUNS+YzdaUbP8c3OaYNP6Rb35Fn9acCAwEAAaOC A5AwggOMMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYB BQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQU0ngY9W1wSL6b2jXnssrfIv2J XHQwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEwbwYIKwYBBQUHAQEE YzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMubGV0c2VuY3J5cHQu b3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0c2VuY3J5cHQu b3JnLzCBkQYDVR0RBIGJMIGGgg9iaW9jbGltYS5jb20uZ3KCFmNwYW5lbC5iaW9j bGltYS5jb20uZ3KCFG1haWwuYmlvY2xpbWEuY29tLmdyghd3ZWJkaXNrLmJpb2Ns aW1hLmNvbS5ncoIXd2VibWFpbC5iaW9jbGltYS5jb20uZ3KCE3d3dy5iaW9jbGlt YS5jb20uZ3Iwgf4GA1UdIASB9jCB8zAIBgZngQwBAgEwgeYGCysGAQQBgt8TAQEB MIHWMCYGCCsGAQUFBwIBFhpodHRwOi8vY3BzLmxldHNlbmNyeXB0Lm9yZzCBqwYI KwYBBQUHAgIwgZ4MgZtUaGlzIENlcnRpZmljYXRlIG1heSBvbmx5IGJlIHJlbGll ZCB1cG9uIGJ5IFJlbHlpbmcgUGFydGllcyBhbmQgb25seSBpbiBhY2NvcmRhbmNl IHdpdGggdGhlIENlcnRpZmljYXRlIFBvbGljeSBmb3VuZCBhdCBodHRwczovL2xl dHNlbmNyeXB0Lm9yZy9yZXBvc2l0b3J5LzCCAQUGCisGAQQB1nkCBAIEgfYEgfMA 8QB2ANt0r+7LKeyx/so+cW0s5bmquzb3hHGDx12dTze2H79kAAABZemUxXkAAAQD AEcwRQIgdMnoeyctM+IMHtq8EFRTqK9t/fy3lnUy8ypbulFc5WwCIQCLNCGPVocl euUiLczZneUquGDS+5BCNKD9PmVjPyBg4wB3ACk8UZZUyDlluqpQ/FgH1Ldvv1h6 KXLcpMMM9OVFR/R4AAABZemUxzEAAAQDAEgwRgIhAKuGuF7tLK3E8MG9LfFIdls9 CovFylImqyKY0WBT/hFcAiEAoHA5Je/aUHHjUIcEN1/V/SmxQVHGRt6WDte8eNRD wiswDQYJKoZIhvcNAQELBQADggEBAEGzt15tYZrvszN6QfUqXz7xKBCJswDKQ+8i Qq68YIsnD/5l3bG7YmC3qUfTcEoyrW/AhYbjRudX1SMpPRW7X7WyQJstOO1yCOiH D8F16L8UQsPY6BL8B3NDlunubXflJW8CmIz6skWZAEHQnET1dX+18NT6o44/9Nh5 xSUp7RiKw/qKESaqZ+vdvHmRdx48lN6X2hK88LDzZPaoYQShHHWU/Z40PT7kcS9J WudCARP1UQJDtCzr9mWx5kfPiOZZYMR9EEyB/p0bL3Doa3oWePAN2UFbUnXHOTPj HV9dQlVs4zGHSduxL16hOV4Kljx+Ik+3f+NaZLGDyC4LcZ31nCM= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAutOeDrpx3CFOjO/mTmwX CtLA8UIDF+FFSs0YK2SGQxJtYytPkKtdjyAnYXd/AQmu56mx/Rn+e2LtTDZ8wnzK f9t+SiCEHlED6InjGQRJWWMC/qqNj4FWw67SQXnY+7QNpZ2AlAYFKphIRZWOB17G zFWC3rGzoPKq+u1jU9dgR0VWZNHgWJqFDtYoITBMLBgVYjbFaYZrnZ2uj3+A+5q1 s5YACdF4Vp91A/ia0vkKp6npKwAYZG88/k2k4kbqV0q3pbpngEaX6XyZV39U1RbM 2EUY3zYYHVbieSFwEfLKggIMeZFD+bxvUZaFVQ1L5jN1pRs/xzc5pg0/pFvfkWf1 pwIDAQAB -----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 298057234642183274809775070725120170115608 . . . . . . . . [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 2018-09-17 21:09:25 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2018-12-16 21:09:25 +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 'bioclima.com.gr' . . . . . . . . [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 23584677158929009009284850406394595784832756364144100193456459816351172377945049726577710197983904047045867202820249863197570288373683696608474419320521293333946707108097081094672992549519045936791579542327966128205592943202964184820103580993581807937282049175633854213656944033667259360239473514895255820840925069753874860591182122625632919783077650593074904553173949410546583181448429227664682790761029196848853467644691457392731630395547709588130472253302750990402604456145551655392943801817982938054384367821166866931682859979451255319565713928562162686726709266326891478744229538275502316510101541979056597628327 . . . . . . . . . . . . . . . . . . . . [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) d27818f56d7048be9bda35e7b2cadf22fd895c74 . . . . . . . . . . . . . . . . [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 (137 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'bioclima.com.gr' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.bioclima.com.gr' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.bioclima.com.gr' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.bioclima.com.gr' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.bioclima.com.gr' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.bioclima.com.gr' . . . . . . . . . . . . . . . . [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 (246 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes) 00f1007600db74afeecb29ecb1feca3e716d2ce5b9aabb36f7847183c75d9d4f37b61fbf6400000165e994c5790000040300473045022074c9e87b272d33e20c1edabc105453a8af6dfdfcb7967532f32a5bba515ce56c0221008b34218f5687257ae5222dccd99de52ab860d2fb904234a0fd3e65633f2060e3007700293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f47800000165e994c7310000040300483046022100ab86b85eed2cadc4f0c1bd2df148765b3d0a8bc5ca5226ab2298d16053fe115c022100a0703925efda5071e3508704375fd5fd29b14151c646de960ed7bc78d443c22b . . . . [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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