mail.techlib.cz
Issued by R3
About this certificate
This digital certificate with serial number 03:87:c4:61:fe:37:d8:20:28:2e:5b:81:17:40:5e:5b:55:19 was issued on by Let's Encrypt.
With 3 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.techlib.cz
Let's Encrypt
Organization:
Let's Encrypt
Country:
US
This certificate has expire since
Certificate Details
Serial Number (hex): 03:87:c4:61:fe:37:d8:20:28:2e:5b:81:17:40:5e:5b:55:19Serial Number (int): 307536014825733029800102651725141587481881
Serial Number lenght: 138 bits, 18 octets
SubjectKeyId: f0:09:80:ab:c8:18:7a:05:d8:f8:97:0f:c1:91:4d:a9:c2:bd:76:95
AuthorityKeyId: 14:2e:b3:17:b7:58:56:cb:ae:50:09:40:e6:1f:af:9d:8b:14:c2:c6
Fingerprint (sha1): c5:82:44:cf:c3:0d:f8:b7:4c:25:9d:a0:57:3b:d8:81:41:ae:5d:f4
Fingerprint (sha256): 4f:c8:6d:89:7c:4e:a7:78:4a:a6:14:6e:2c:b3:6b:5e:26:cd:1c:11:18:96:e8:21:b5:70:ee:4d:4a:14:08:81
Issuing Certificate URL: http://r3.i.lencr.org/
Revocation information
OCSP Server: http://r3.o.lencr.orgCheck the revocation status for certificate mail.techlib.cz
3
DNS Names
0
Email Addresses
0
IP Addresses
Advanced Certificate Properties
Tehnical certificate details for mail.techlib.cz
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
mail.techlib.cz
mail2.techlib.cz
zimbra.ntkcz.cz
mail2.techlib.cz
zimbra.ntkcz.cz
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caslin2013.techlib.cz
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techlib.cz
Certificate
The complete raw certificate details for mail.techlib.cz in PEM and ASN.1 format.
Certificate (PEM)
-----BEGIN CERTIFICATE----- MIIFSDCCBDCgAwIBAgISA4fEYf432CAoLluBF0BeW1UZMA0GCSqGSIb3DQEBCwUA MDIxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQswCQYDVQQD EwJSMzAeFw0yMzA0MTAwNzMyMDJaFw0yMzA3MDkwNzMyMDFaMBoxGDAWBgNVBAMT D21haWwudGVjaGxpYi5jejCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEB AL2+UvxTPLKDj18Qej0arGiyk9IBz7A8SxymlU0/lBZQtYnaBL3XhRPg4eDgvn9w AcAo7EWNkaGXGYBbtR95VjSMK4FnE6BxZGAWUC/1ubNyB3d8k9lsyA6bEDQnsOn0 PH2kqfYWrmVg9hkG8A3dOFb9jLGl7+6rlASdMyO0sEzpZOosFSCgo1hxAjkAF3j7 +8MJUJt6N8S39RwnNdkN3ELm+QHl35ZAh2uv9u01Yhv8095Gm11N1FhBaq9g9pXU xXjA1YIdfdsnmPhD2GpN3HTvBLVbKSu/b2Vj9W9J5UWtuC7l87NA60thbVat3XFu 1JhQV8XB8et3JecpmKs0ojECAwEAAaOCAm4wggJqMA4GA1UdDwEB/wQEAwIFoDAd BgNVHSUEFjAUBggrBgEFBQcDAQYIKwYBBQUHAwIwDAYDVR0TAQH/BAIwADAdBgNV HQ4EFgQU8AmAq8gYegXY+JcPwZFNqcK9dpUwHwYDVR0jBBgwFoAUFC6zF7dYVsuu UAlA5h+vnYsUwsYwVQYIKwYBBQUHAQEESTBHMCEGCCsGAQUFBzABhhVodHRwOi8v cjMuby5sZW5jci5vcmcwIgYIKwYBBQUHMAKGFmh0dHA6Ly9yMy5pLmxlbmNyLm9y Zy8wPQYDVR0RBDYwNIIPbWFpbC50ZWNobGliLmN6ghBtYWlsMi50ZWNobGliLmN6 gg96aW1icmEubnRrY3ouY3owTAYDVR0gBEUwQzAIBgZngQwBAgEwNwYLKwYBBAGC 3xMBAQEwKDAmBggrBgEFBQcCARYaaHR0cDovL2Nwcy5sZXRzZW5jcnlwdC5vcmcw ggEFBgorBgEEAdZ5AgQCBIH2BIHzAPEAdgC3Pvsk35xNunXyOcW6WPRsXfxCz3qf NcSeHQmBJe20mQAAAYdqSyaXAAAEAwBHMEUCIDJe60oOSH34DbxLqWsybaG0KHlz uVHZGot7xEKBIdk6AiEAyqqYSrLcOEeHx+JJmGVbeSx0S6iHXzjTSfc4y1vXSBsA dwB6MoxU2LcttiDqOOBSHumEFnAyE4VNO9IrwTpXo1LrUgAAAYdqSyidAAAEAwBI MEYCIQDt7yYQiXCGVFLU1gRoT2N86yxhqPnsHO7EhQi3LI/WHgIhANdxIFwPIgbW ttuT1o9yV428okIwkXgjwFx7GXk9s4+IMA0GCSqGSIb3DQEBCwUAA4IBAQCoQXis P883g8LZ0Pix2O+KTHqSRQ1cm4DGDgZyeAmiXFewj2eyAbbJ5OlN7ovdM5yY2vBS pWDm/NcmJcxSCEOmBVEdJ9Nb69KMYGBpVOXnqA1wJB5RwdMuqoUgUa2FgKFPandN nw69y/cWL9uBW6KDuTzblpVHhygu/wFOPytfFIDV9ZFAgNwp7nd9ZzB3grU3gczl 5Fp4kjaVEhDtWxH/UEcc26uiwshYAfbyU94kKbfWGHj6EuvHd2+ivleIZbz/2uL0 bTO60oww2Czs0taAqc+e7LUo4tANxQ/0bsPKZQnlXfAZNgLRsDIBWQmOlIXk8c/k I4Zq1Z3QMmRlFQaa -----END CERTIFICATE-----
Public Key (PEM)
-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvb5S/FM8soOPXxB6PRqs aLKT0gHPsDxLHKaVTT+UFlC1idoEvdeFE+Dh4OC+f3ABwCjsRY2RoZcZgFu1H3lW NIwrgWcToHFkYBZQL/W5s3IHd3yT2WzIDpsQNCew6fQ8faSp9hauZWD2GQbwDd04 Vv2MsaXv7quUBJ0zI7SwTOlk6iwVIKCjWHECOQAXePv7wwlQm3o3xLf1HCc12Q3c Qub5AeXflkCHa6/27TViG/zT3kabXU3UWEFqr2D2ldTFeMDVgh192yeY+EPYak3c dO8EtVspK79vZWP1b0nlRa24LuXzs0DrS2FtVq3dcW7UmFBXxcHx63cl5ymYqzSi MQIDAQAB -----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 307536014825733029800102651725141587481881 . . . . . . . . [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 2023-04-10 07:32:02 +0000 UTC . . . . . . . . . . . . [c:0|t:23|false] UTCTime 2023-07-09 07:32:01 +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.techlib.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 (2160 bits) . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . [c:0|t:2|false] INTEGER 23952891981125403915865617546641103518329846866096169331380984713902688577365782310990337907221326301977791119398423329415434154425111250484832150994489338467696036934919409303448028009784960128056064298404432037008744712803403892161405325612432951253204418238985674448833177944939113467086000229822048510210287080220098450496294108546291073075896820755960865835873228933286946235107451823451645293407427098696633646159680803241814895424661581941326447388131472046514583241370386436275324066693582780677754497660505904127182369325773243002109549589150047920466670967589263808892852020911300739335928606603254403736113 . . . . . . . . . . . . . . . . . . . . [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) f00980abc8187a05d8f8970fc1914da9c2bd7695 . . . . . . . . . . . . . . . . [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 (54 bytes) . . . . . . . . . . . . . . . . . . . . . . . . [c:0|t:16|true] SEQUENCE, SEQUENCE OF . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail.techlib.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'mail2.techlib.cz' . . . . . . . . . . . . . . . . . . . . . . . . . . . . [c:2|t:2|false] IA5String 'zimbra.ntkcz.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) 00f1007600b73efb24df9c4dba75f239c5ba58f46c5dfc42cf7a9f35c49e1d098125edb499000001876a4b269700000403004730450220325eeb4a0e487df80dbc4ba96b326da1b4287973b951d91a8b7bc4428121d93a022100caaa984ab2dc384787c7e24998655b792c744ba8875f38d349f738cb5bd7481b0077007a328c54d8b72db620ea38e0521ee98416703213854d3bd22bc13a57a352eb52000001876a4b289d0000040300483046022100edef26108970865452d4d604684f637ceb2c61a8f9ec1ceec48508b72c8fd61e022100d771205c0f2206d6b6db93d68f72578dbca24230917823c05c7b19793db38f88 . . . . [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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