ehv.ch
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 03:b4:46:af:11:36:ef:f9:90:d5:b8:aa:d9:bb:0d:ba:76:94 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=ehv.ch
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:b4:46:af:11:36:ef:f9:90:d5:b8:aa:d9:bb:0d:ba:76:94Serial Number (int): 322681638801858403730905680836013349041812
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: 3e:f2:11:30:26:bc:d5:07:71:89:37:2a:d5:62:21:dc:c7:26:99:7e
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): de:66:93:6e:a8:35:61:74:a7:77:e4:b3:12:83:e4:ba:d4:4e:b2:bc
Fingerprint (sha256): b5:99:5c:33:a9:ed:70:6d:f8:08:6b:5d:ba:dd:f0:f1:e4:16:9e:df:5c:d5:8b:ae:af:f1:15:48:49:02:f2:ef
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate ehv.ch
6
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for ehv.ch
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.ehv.ch
ehv.ch
mail.ehv.ch
webdisk.ehv.ch
webmail.ehv.ch
www.ehv.ch
ehv.ch
mail.ehv.ch
webdisk.ehv.ch
webmail.ehv.ch
www.ehv.ch
Other certificates including the domain name ehv.ch
(limited to 100 certificates)
ehv.ch
ehv.ch
ehv.ch
*.ehv.ch
ehv.ch
neu.ehv.ch
ehv.ch
ehv.ch
ehv.ch
*.ehv.ch
ehv.ch
ehv.ch
ozhv.ehv.ch
ehv.ch
ehv.ch
cloud.ehv.ch
ehv.ch
cloud.ehv.ch
cloud.ehv.ch
ehv.ch
cloud.ehv.ch
ehv.ehv.ch
ehv.ch
*.ehv.ch
ehv.ch
ehv.ch
ehv.ch
neu.ehv.ch
ehv.ch
ehv.ch
ehv.ch
ehv.ch
ehv.ch
ehv.ch
ehv.ch
cloud.ehv.ch
ehv.ch
limbas.ehv.ch
*.ehv.ch
ozhv.ehv.ch
www.spesen.ehv.ch
cloud.ehv.ch
ehv.ch
ehv.ch
spesen.ehv.ch
ehv.ch
ehv.ch
*.ehv.ch
ehv.ch
neu.ehv.ch
ehv.ch
ehv.ch
ehv.ch
*.ehv.ch
ehv.ch
ehv.ch
ozhv.ehv.ch
ehv.ch
ehv.ch
cloud.ehv.ch
ehv.ch
cloud.ehv.ch
cloud.ehv.ch
ehv.ch
cloud.ehv.ch
ehv.ehv.ch
ehv.ch
*.ehv.ch
ehv.ch
ehv.ch
ehv.ch
neu.ehv.ch
ehv.ch
ehv.ch
ehv.ch
ehv.ch
ehv.ch
ehv.ch
ehv.ch
cloud.ehv.ch
ehv.ch
limbas.ehv.ch
*.ehv.ch
ozhv.ehv.ch
www.spesen.ehv.ch
cloud.ehv.ch
ehv.ch
ehv.ch
spesen.ehv.ch
Certificate
The complete raw certificate details for ehv.ch in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFijCCBHKgAwIBAgISA7RGrxE27/mQ1biq2bsNunaUMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0xOTA5MjQxNzQ4NTVaFw0x OTEyMjMxNzQ4NTVaMBExDzANBgNVBAMTBmVodi5jaDCCASIwDQYJKoZIhvcNAQEB BQADggEPADCCAQoCggEBALq09ta9bkWPocw9xaQaogrR/nk0/XYB6afbWdZ4n8hb ++zlc4oXCUyJD3i8n6JtxMs+ebnk/BcyQ/k2mUpCZeO7C17xVAI/JCr86ATaqMcL VySM6Nnui3SLcUwceExQ+F8FueIeRv4LTYSLR/CdC4H3SJS0uOl0t0T0unfZvxMd gKa9uYhSPCOWNHM3DmPPLP2TTsD3+V4qSrLmoEeeQlIABxShDUeBvjluxzDibSI1 eUiE3mckF1Cb3XWN6DnA6y4S/UqBYHBuUEnTDb5SwBQYwHf4M9HZsKlG97DP28GH SnwyM/x2c4PEiDs//pwC4pr6io7WA+qMphch022GrIsCAwEAAaOCAqEwggKdMA4G A1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYD VR0TAQH/BAIwADAdBgNVHQ4EFgQUPvIRMCa81QdxiTcq1WIh3McmmX4wHwYDVR0j BBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEwbwYIKwYBBQUHAQEEYzBhMC4GCCsG AQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMubGV0c2VuY3J5cHQub3JnMC8GCCsG AQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMubGV0c2VuY3J5cHQub3JnLzBZBgNV HREEUjBQgg1jcGFuZWwuZWh2LmNoggZlaHYuY2iCC21haWwuZWh2LmNogg53ZWJk aXNrLmVodi5jaIIOd2VibWFpbC5laHYuY2iCCnd3dy5laHYuY2gwTAYDVR0gBEUw QzAIBgZngQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEFBQcCARYaaHR0cDov L2Nwcy5sZXRzZW5jcnlwdC5vcmcwggECBgorBgEEAdZ5AgQCBIHzBIHwAO4AdQAp PFGWVMg5ZbqqUPxYB9S3b79Yeily3KTDDPTlRUf0eAAAAW1kmuTHAAAEAwBGMEQC IH+yz7J6dtwR0NoR1Y7IswGActLfq1rrqdkk8aQ84/l2AiAniWmeWtCP76wyWhif +YEQ2UFZz69IwQJxscSZfqwBiAB1AOJpS64m6OlACeiGG7Y7g9Q+5/50iPukjyiT AZ3d8dv+AAABbWSa5sYAAAQDAEYwRAIgQVx/Gr1PziZNv1dyPZfliK4acfTL3e+e 0YeK4FMFiosCIB7pNwtupj5rPe/7LMsOnxfpIugKBFakhP0+8bhdWH8oMA0GCSqG SIb3DQEBCwUAA4IBAQARRSmOPSaGE5S52cE8mHbt0EYSrToJgNyzH1NlM6T5/xVO hSHIL6q2t56wIgnkzBOR0IQBzx6hEX3VO0tv3QZs2ii7bZKKtDQIbepiTbZ73ef+ uWr3EDVkrAL29H5Qly0GQKeezkGvNwrhdfzGauK1N7YaL0q4SnGyWgus/aQTL3do SEIsfI8/c95+rJle7RQt4EPF4p0O2+8EyP3B6y6a3r5GaUFxer1MtCV/OqFpcETq UQWLmMJBPO9dgY8FgwGCE6WjqNEzx2fJHpqGxxlSFV4N39OjtGRDQxI1TgYwJL/x MczFOTimCxf+EvLG6LuFh0usXP8ytW08WdwWJS1f -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAurT21r1uRY+hzD3FpBqi CtH+eTT9dgHpp9tZ1nifyFv77OVzihcJTIkPeLyfom3Eyz55ueT8FzJD+TaZSkJl 47sLXvFUAj8kKvzoBNqoxwtXJIzo2e6LdItxTBx4TFD4XwW54h5G/gtNhItH8J0L gfdIlLS46XS3RPS6d9m/Ex2Apr25iFI8I5Y0czcOY88s/ZNOwPf5XipKsuagR55C UgAHFKENR4G+OW7HMOJtIjV5SITeZyQXUJvddY3oOcDrLhL9SoFgcG5QSdMNvlLA FBjAd/gz0dmwqUb3sM/bwYdKfDIz/HZzg8SIOz/+nALimvqKjtYD6oymFyHTbYas iwIDAQAB -----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 322681638801858403730905680836013349041812 . . . . . . . . [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 2019-09-24 17:48:55 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2019-12-23 17:48:55 +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 'ehv.ch' . . . . . . . . [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 23569561503595358175419094360900140785511771962386486691555455841512035602172593907349282716113892864098967078116974370072542857363513301897647812989713919036568468641302226129641861860969110945348782229775685823478055465896249254210536063791600470869880843118093996217184757703031702502434744600412764419548527829588197378228137186851397520205623300164867577897810571261740934465641484809858829408808392493257007729786860697014814328744114265482935227258302700312883197383244552640540834956515061357813379147484529227460912020473115005369041344113667320013709325333299634956328150311067597946937030369232012993539211 . . . . . . . . . . . . . . . . . . . . [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) 3ef2113026bcd5077189372ad56221dcc726997e . . . . . . . . . . . . . . . . [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 (82 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'cpanel.ehv.ch' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'ehv.ch' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.ehv.ch' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webdisk.ehv.ch' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'webmail.ehv.ch' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'www.ehv.ch' . . . . . . . . . . . . . . . . [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 (243 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (240 bytes) 00ee007500293c519654c83965baaa50fc5807d4b76fbf587a2972dca4c30cf4e54547f4780000016d649ae4c7000004030046304402207fb2cfb27a76dc11d0da11d58ec8b3018072d2dfab5aeba9d924f1a43ce3f97602202789699e5ad08fefac325a189ff98110d94159cfaf48c10271b1c4997eac0188007500e2694bae26e8e94009e8861bb63b83d43ee7fe7488fba48f2893019dddf1dbfe0000016d649ae6c600000403004630440220415c7f1abd4fce264dbf57723d97e588ae1a71f4cbddef9ed1878ae053058a8b02201ee9370b6ea63e6b3deffb2ccb0e9f17e922e80a0456a484fd3ef1b85d587f28 . . . . [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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