mail.nic.cz
Issued by Let's Encrypt Authority X3
About this certificate
This digital certificate with serial number 04:81:c0:fc:4e:a7:e8:b2:66:c4:56:91:39:a5:53:60:f6:ab was issued on by Let's Encrypt.
With 4 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=mail.nic.cz
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 04:81:c0:fc:4e:a7:e8:b2:66:c4:56:91:39:a5:53:60:f6:abSerial Number (int): 392602090889172171418520904836914224363179
Serial Number lenght: 139 bits, 18 octets
SubjectKeyId: 6a:00:9c:05:a7:85:0d:f3:b4:33:38:b1:ca:e1:5d:f4:d7:96:b8:09
AuthorityKeyId: a8:4a:6a:63:04:7d:dd:ba:e6:d1:39:b7:a6:45:65:ef:f3:a8:ec:a1
Fingerprint (sha1): 43:8d:3e:4c:de:bc:d9:83:22:ca:36:99:ef:66:11:30:b9:24:b7:16
Fingerprint (sha256): 04:dd:23:df:1e:d2:22:a5:54:2a:e9:90:ca:ff:97:4c:e6:cd:10:cd:a9:71:00:f9:05:2d:16:66:38:68:44:e4
Issuing Certificate URL: http://cert.int-x3.letsencrypt.org/
Revocation information
OCSP Server: http://ocsp.int-x3.letsencrypt.orgCheck the revocation status for certificate mail.nic.cz
4
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for mail.nic.cz
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
9 extensions
No
unhandled critical extensions
CA Certificate
This is not a CA certificate
Subject Alternative Names
jabber.nic.cz
lists.nic.cz
mail.nic.cz
nic.cz
lists.nic.cz
mail.nic.cz
nic.cz
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Certificate
The complete raw certificate details for mail.nic.cz in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIGczCCBVugAwIBAgISBIHA/E6n6LJmxFaROaVTYParMA0GCSqGSIb3DQEBCwUA MEoxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MSMwIQYDVQQD ExpMZXQncyBFbmNyeXB0IEF1dGhvcml0eSBYMzAeFw0yMDAxMjgxMzA3MjlaFw0y MDA0MjcxMzA3MjlaMBYxFDASBgNVBAMTC21haWwubmljLmN6MIICIjANBgkqhkiG 9w0BAQEFAAOCAg8AMIICCgKCAgEAuUHkuIgOOxULeqRMLGdKNezMUSzqSlLscoHF BcGJl1H7xdArvBUgRmYxsr2ziCl7ShskC26bAGJwKf4fJ/0AI3bp9FrMNEhGdllV 0HktnAwaIJOyZse7ymI8FmBHU0/ZTmTdD+jMvVyOnGsk41vpoo709VcdviMEV9eT e36BrMr1XMaccauMRyEenZEeb2101HyU+5cXXoMJzGph7lP4nlD+MtwX19x3oOEW MUNTGBoUtDry+Dk5T+8VcL+cXBMiYQCcTW2Vk3XHFuFftkRzibZ/7GDn71Xn1B6W abe2MltWbAGB8Ka6twB/YcrS8qRCF2Lovp0IRBXkmGztGA49gnAOM7PCtwoaIuG8 YgVqenRq16ob+zxxdtikuvbgmCEA1mAlADhrY0V1FhdQqd+S22dA154hX6epkMEu ZuUeFEx5hPCz+o1/ZY4lrPbeVTZcgDXq6vtfeznxTSMFyogptUPqtX2O8xyNU4VE g3aLxgP0aKyz/JYAvTtuSOh5jglwc2Ry+HW1iN0XxwDew2xTd1gkVTn93yUJlsya pm/PADeh4b4yBo1zvhGF0I4hK+ys700eKw8xTA6PZG8QfN+7dVAx4/BbirJTbV9F ayfyFpwDtVgEaENZqVn+oXdDfAUb8kbrg/O4U24cWkriwhAvnaTitUpjyc7qPAG9 eZ86IV8CAwEAAaOCAoUwggKBMA4GA1UdDwEB/wQEAwIFoDAdBgNVHSUEFjAUBggr BgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNVHQ4EFgQUagCcBaeF DfO0MzixyuFd9NeWuAkwHwYDVR0jBBgwFoAUqEpqYwR93brm0Tm3pkVl7/Oo7KEw bwYIKwYBBQUHAQEEYzBhMC4GCCsGAQUFBzABhiJodHRwOi8vb2NzcC5pbnQteDMu bGV0c2VuY3J5cHQub3JnMC8GCCsGAQUFBzAChiNodHRwOi8vY2VydC5pbnQteDMu bGV0c2VuY3J5cHQub3JnLzA7BgNVHREENDAygg1qYWJiZXIubmljLmN6ggxsaXN0 cy5uaWMuY3qCC21haWwubmljLmN6ggZuaWMuY3owTAYDVR0gBEUwQzAIBgZngQwB AgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEFBQcCARYaaHR0cDovL2Nwcy5sZXRz ZW5jcnlwdC5vcmcwggEEBgorBgEEAdZ5AgQCBIH1BIHyAPAAdgBep3P531bA57U2 SH3QSeAyepGaDIShEhKEGHWWgXFFWAAAAW/seoG+AAAEAwBHMEUCIQDngJlIJVxM xooiSdHpwhiXh/kOTQORQuX1KHrTLAWCNQIgPHVSzNY6MJlQ7d/bOkHVhUHUxHfY he6IEXBJTR0mq6cAdgAHt1wb5X1o//Gwxh0jFce65ld8V5S3au68YToaadOiHAAA AW/seoHiAAAEAwBHMEUCIQCO8/tCEBBb1CbFQxsockM+g9amLFgC2QLTTTqNP/W2 QwIgDKsqEyKVHKawAflN4k6elmtMc39Ho9iTBhV9Ey7PkXQwDQYJKoZIhvcNAQEL BQADggEBACG9vfks3scNldC+H+Sdv4eDjlGe6Ns+WFc1Jqzwsiw+kyee6Zvc+VLy 1WfNJfb9Oo+L9bcnlcDOCoE2SSNUUlsnDjHw64nlX1hzP1n77K4PPvpI2JPVu7R/ 21BInOHqonGfZT5FADm3pBPoj4rE0u2Q3OJYeOoFvxidHIv2zisgL8VjzoxZB2Uh GY7MjjzWnlZA88ROPT3iU2nCUDJcX5Evu3k5IwHF+gbWh513qO5jbTwbgJ9BomOZ WVAbAn5gcZMwTfYupYrna0OS3Beb1kxCj3kQwTBsHXCU2wXsv1AMWBoJyi8WEdz8 iXTdaz6Gnjgw+4SYrsDLOwJ9A8+mt88= -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAuUHkuIgOOxULeqRMLGdK NezMUSzqSlLscoHFBcGJl1H7xdArvBUgRmYxsr2ziCl7ShskC26bAGJwKf4fJ/0A I3bp9FrMNEhGdllV0HktnAwaIJOyZse7ymI8FmBHU0/ZTmTdD+jMvVyOnGsk41vp oo709VcdviMEV9eTe36BrMr1XMaccauMRyEenZEeb2101HyU+5cXXoMJzGph7lP4 nlD+MtwX19x3oOEWMUNTGBoUtDry+Dk5T+8VcL+cXBMiYQCcTW2Vk3XHFuFftkRz ibZ/7GDn71Xn1B6Wabe2MltWbAGB8Ka6twB/YcrS8qRCF2Lovp0IRBXkmGztGA49 gnAOM7PCtwoaIuG8YgVqenRq16ob+zxxdtikuvbgmCEA1mAlADhrY0V1FhdQqd+S 22dA154hX6epkMEuZuUeFEx5hPCz+o1/ZY4lrPbeVTZcgDXq6vtfeznxTSMFyogp tUPqtX2O8xyNU4VEg3aLxgP0aKyz/JYAvTtuSOh5jglwc2Ry+HW1iN0XxwDew2xT d1gkVTn93yUJlsyapm/PADeh4b4yBo1zvhGF0I4hK+ys700eKw8xTA6PZG8QfN+7 dVAx4/BbirJTbV9FayfyFpwDtVgEaENZqVn+oXdDfAUb8kbrg/O4U24cWkriwhAv naTitUpjyc7qPAG9eZ86IV8CAwEAAQ== -----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 392602090889172171418520904836914224363179 . . . . . . . . [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 2020-01-28 13:07:29 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2020-04-27 13:07:29 +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 'mail.nic.cz' . . . . . . . . [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 755784237679747906423685823444927470404024262904357279337337900750796359045547183379995855425225953848334208030158850379723026714794944665787038409707733838160997387582362316383925377822308051133437372660392721997418108830731426718529530287359938633726378517652609741325587368626718144215257468717129834790952940088034501756122790712041236432527752561984308524691451521531214248890128312915547482069756419657363338331497517021576671323847136791255779196392502104913168163294099245708215480651235321619206522601795164282682832183707990264646372095426460700191168935048650717610531264743365548159339240859194201892953614620193356886005205641422101643414030650995221645342249697152174710224189762845516173174380476116204586121181002398177987402196764614813530618240974439426441862615089454613401385548059644993212644788076012499780241249960570054706989361860583715953952609405143571847383826635753938467064506147961037998955803853952507624352796383115186195863689670494625136909839720838695728829654764275703940630442049180107472394615591486459225826701712308636298986340283774285061099324380026026379424589055870666693390178586949595159726310556070999837036294389203145705687125999345716784763302149067826187878877011055851521141514591 . . . . . . . . . . . . . . . . . . . . [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) 6a009c05a7850df3b43338b1cae15df4d796b809 . . . . . . . . . . . . . . . . [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 (52 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'jabber.nic.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'lists.nic.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.nic.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'nic.cz' . . . . . . . . . . . . . . . . [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 (245 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (242 bytes) 00f00076005ea773f9df56c0e7b536487dd049e0327a919a0c84a1121284187596817145580000016fec7a81be0000040300473045022100e7809948255c4cc68a2249d1e9c2189787f90e4d039142e5f5287ad32c05823502203c7552ccd63a309950eddfdb3a41d58541d4c477d885ee881170494d1d26aba700760007b75c1be57d68fff1b0c61d2315c7bae6577c5794b76aeebc613a1a69d3a21c0000016fec7a81e200000403004730450221008ef3fb4210105bd426c5431b2872433e83d6a62c5802d902d34d3a8d3ff5b64302200cab2a1322951ca6b001f94de24e9e966b4c737f47a3d89306157d132ecf9174 . . . . [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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