mail.nic.cz
Issued by R3
About this certificate
This digital certificate with serial number 03:bb:ae:35:90:ee:e0:56:b9:c5:84:3b:73:48:7f:13:5a:d5 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): 03:bb:ae:35:90:ee:e0:56:b9:c5:84:3b:73:48:7f:13:5a:d5Serial Number (int): 325201224212089025406609582440900877048533
Serial Number lenght: 138 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: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): 37:e4:97:a6:36:26:09:58:e2:c1:1c:c8:e9:26:99:d7:58:05:63:f8
Fingerprint (sha256): 06:de:d2:4c:a6:33:b3:a1:aa:12:6f:7a:7b:91:94:3f:87:44:0e:92:de:4b:21:b0:92:cd:23:6d:d2:5a:c2:32
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.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
mail.nic.cz
rspamd.nic.cz
smtp.nic.cz
smtps.nic.cz
rspamd.nic.cz
smtp.nic.cz
smtps.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----- MIIGRzCCBS+gAwIBAgISA7uuNZDu4Fa5xYQ7c0h/E1rVMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzA0MjcxNDEwMDJaFw0yMzA3MjYxNDEwMDFaMBYxFDASBgNVBAMT C21haWwubmljLmN6MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAuUHk uIgOOxULeqRMLGdKNezMUSzqSlLscoHFBcGJl1H7xdArvBUgRmYxsr2ziCl7Shsk C26bAGJwKf4fJ/0AI3bp9FrMNEhGdllV0HktnAwaIJOyZse7ymI8FmBHU0/ZTmTd D+jMvVyOnGsk41vpoo709VcdviMEV9eTe36BrMr1XMaccauMRyEenZEeb2101HyU +5cXXoMJzGph7lP4nlD+MtwX19x3oOEWMUNTGBoUtDry+Dk5T+8VcL+cXBMiYQCc TW2Vk3XHFuFftkRzibZ/7GDn71Xn1B6Wabe2MltWbAGB8Ka6twB/YcrS8qRCF2Lo vp0IRBXkmGztGA49gnAOM7PCtwoaIuG8YgVqenRq16ob+zxxdtikuvbgmCEA1mAl ADhrY0V1FhdQqd+S22dA154hX6epkMEuZuUeFEx5hPCz+o1/ZY4lrPbeVTZcgDXq 6vtfeznxTSMFyogptUPqtX2O8xyNU4VEg3aLxgP0aKyz/JYAvTtuSOh5jglwc2Ry +HW1iN0XxwDew2xTd1gkVTn93yUJlsyapm/PADeh4b4yBo1zvhGF0I4hK+ys700e Kw8xTA6PZG8QfN+7dVAx4/BbirJTbV9FayfyFpwDtVgEaENZqVn+oXdDfAUb8kbr g/O4U24cWkriwhAvnaTitUpjyc7qPAG9eZ86IV8CAwEAAaOCAnEwggJtMA4GA1Ud DwEB/wQEAwIFoDAdBgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0T AQH/BAIwADAdBgNVHQ4EFgQUagCcBaeFDfO0MzixyuFd9NeWuAkwHwYDVR0jBBgw FoAUFC6zF7dYVsuuUAlA5h+vnYsUwsYwVQYIKwYBBQUHAQEESTBHMCEGCCsGAQUF BzABhhVodHRwOi8vcjMuby5sZW5jci5vcmcwIgYIKwYBBQUHMAKGFmh0dHA6Ly9y My5pLmxlbmNyLm9yZy8wQAYDVR0RBDkwN4ILbWFpbC5uaWMuY3qCDXJzcGFtZC5u aWMuY3qCC3NtdHAubmljLmN6ggxzbXRwcy5uaWMuY3owTAYDVR0gBEUwQzAIBgZn gQwBAgEwNwYLKwYBBAGC3xMBAQEwKDAmBggrBgEFBQcCARYaaHR0cDovL2Nwcy5s ZXRzZW5jcnlwdC5vcmcwggEFBgorBgEEAdZ5AgQCBIH2BIHzAPEAdgC3Pvsk35xN unXyOcW6WPRsXfxCz3qfNcSeHQmBJe20mQAAAYfDQ6GDAAAEAwBHMEUCIAsQtic4 puoh18c46j3FZcwUAh2Z+51fMwcL5ncuV7XiAiEA7jW88lfZ2P/TxDs7Rqmr1oth WM+r6wcGXDf8vzrxaNgAdwB6MoxU2LcttiDqOOBSHumEFnAyE4VNO9IrwTpXo1Lr UgAAAYfDQ6NWAAAEAwBIMEYCIQCuqWbJfkvdYe3UKm5hEuTZwrYk+75rdizTsDVY rz6j2wIhAJr1YjYYzZk60HMnQf1t//4A4sLuizzpbX6iYjFsziT7MA0GCSqGSIb3 DQEBCwUAA4IBAQACTx7uS0qVKnW2A8sN7/YaEOQ6+ZmRqngMjsmVk8chShtRwSYA yVmgIA6Hi/2GV3mm0GudfYUavS4QWuzvPow4gT14A5c3NzZr862eorMMSKpv0Ph/ RXXoI3pLr7Ao0IUfKRtdAxeLJT/NWqsE8xf8rquhTEhJv0tRyzaieIBYppiylkfW 1+1ifD3OUbA0OHAmS3o0xGxlId+tROVSjIVLqxW04fJDvRGT1nuToQpLNEzn0we1 2qeReocHhTsD7agF5lMtnrIytIh3l+vO+ZS0mAB3sRmFpeYQFjAUGjlBteNa4wrM M5oJveDintfdYoMFIpQ8mLztKBjdFjAQ+HqC -----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 325201224212089025406609582440900877048533 . . . . . . . . [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 'R3' . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-04-27 14:10:02 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-07-26 14:10:01 +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 142eb317b75856cbae500940e61faf9d8b14c2c6 . . . . . . . . . . . . . . . . [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 (73 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://r3.o.lencr.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://r3.i.lencr.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 (57 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.nic.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'rspamd.nic.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'smtp.nic.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'smtps.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 (246 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:4|false] OCTET STRING (243 bytes) 00f1007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb49900000187c343a183000004030047304502200b10b62738a6ea21d7c738ea3dc565cc14021d99fb9d5f33070be6772e57b5e2022100ee35bcf257d9d8ffd3c43b3b46a9abd68b6158cfabeb07065c37fcbf3af168d80077007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb5200000187c343a3560000040300483046022100aea966c97e4bdd61edd42a6e6112e4d9c2b624fbbe6b762cd3b03558af3ea3db0221009af5623618cd993ad0732741fd6dfffe00e2c2ee8b3ce96d7ea262316cce24fb . . . . [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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