DNS
THE CERTIFICATE BEHIND THE CONNECTION

TLS certificate checker.

Inspect SSL/TLS certificates for any public domain or subdomain.

Checks HTTPS on port 443, including subject alternative names, validity dates and the presented chain.

SSL certificate

TLSv1.3

zi-tel.com · 213.207.192.25:443

Verified

Certificate chain, hostname and dates verified using this server’s CA store.

Subject
CN=*.zi-tel.com
Issuer
C=PL O=Asseco Data Systems S.A. CN=Certum DV TLS G2 R39 CA
Valid from
2026-10-17T06:53:44+00:00
Expires
2027-05-04T06:53:43+00:00
Days remaining
176
Serial (hex)
639D9F71022AB9C29287F366BE54268A
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:*.zi-tel.com, DNS:zi-tel.com

SHA-256 fingerprint

1F:38:48:37:3C:80:FF:EE:04:B4:B7:00:8A:94:E3:AF:94:87:91:18:1A:44:49:95:E9:1D:A1:B2:1C:08:06:96
Certificate extensions & PEM
basicConstraints
CA:FALSE
crlDistributionPoints
Full Name: URI:http://certumdvtlsg2r39ca.crl.certum.pl/certumdvtlsg2r39ca.crl
authorityInfoAccess
OCSP - URI:http://certumdvtlsg2r39ca.ocsp-certum.com CA Issuers - URI:http://certumdvtlsg2r39ca.repository.certum.pl/certumdvtlsg2r39ca.cer
authorityKeyIdentifier
33:A8:77:B7:01:38:6F:5F:1F:24:24:A2:1E:6C:14:E3:6E:22:03:DF
certificatePolicies
Policy: 2.23.140.1.2.1 Policy: 1.2.616.1.113527.2.101.1
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
keyUsage
Digital Signature, Key Encipherment
subjectAltName
DNS:*.zi-tel.com, DNS:zi-tel.com
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D6:D5:8D:A9:D0:17:53:F3:6A:4A:A0:C7:57:49:02:AF: EB:C7:DC:2C:D3:8C:D9:F7:64:C8:0C:89:19:1E:9F:02 Timestamp : Oct 17 06:53:46.068 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:47:F6:F2:E4:9F:92:65:AF:A8:59:66:3F: D2:84:5C:DD:44:CA:A1:42:19:65:B4:F9:06:AB:45:0E: 67:57:9B:E0:02:21:00:F6:8A:8B:10:44:CB:BA:EF:E7: AB:9A:C4:38:BD:44:63:BA:CF:0B:C9:3E:34:9C:52:7F: 81:AC:AA:D8:5F:67:B0 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 44:C2:BD:0C:E9:14:0E:64:A5:C9:4A:01:93:0A:5A:A1: BB:35:97:0E:00:EE:11:16:89:68:2A:1C:44:D7:B5:66 Timestamp : Oct 17 06:53:46.119 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:7B:B2:3D:CF:7E:58:19:04:E2:48:81:66: 60:2F:5E:EB:B9:6D:4F:93:4B:E9:CE:8A:38:52:8B:30: F3:DF:11:DA:02:20:04:1A:69:12:B0:BE:C3:FB:3F:5D: 77:1C:32:CE:0B:24:0F:F4:E9:DA:B2:29:53:6A:D8:D4: 17:7F:35:01:AC:74 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 1C:9F:68:2C:E9:FA:F0:45:69:50:F8:1B:96:8A:87:DD: DB:32:10:D8:4C:E6:C8:B2:E3:82:52:4A:C4:CF:59:9F Timestamp : Oct 17 06:53:46.209 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:05:92:7C:4C:72:87:13:7A:0B:03:11:50: D7:62:28:B9:C8:A9:77:4E:7E:7A:95:CD:CD:20:6C:C0: 7E:00:94:9C:02:20:22:E2:8E:C1:73:F1:22:65:E1:5C: BA:08:D7:52:A9:99:C1:AF:FA:31:6F:29:11:BD:CF:3B: E6:CA:07:8F:18:F7
-----BEGIN CERTIFICATE-----
MIIIDTCCBfWgAwIBAgIQY52fcQIqucKSh/NmvlQmijANBgkqhkiG9w0BAQsFADBS
MQswCQYDVQQGEwJQTDEhMB8GA1UECgwYQXNzZWNvIERhdGEgU3lzdGVtcyBTLkEu
MSAwHgYDVQQDDBdDZXJ0dW0gRFYgVExTIEcyIFIzOSBDQTAeFw0yNjEwMTcwNjUz
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mV/dkD4ifRloF2zW9dfVxrIX/tGHfLKVVoVT4e7CXmSxxJXtYukaYaWp89O6Snk0
T5e0nyF35tXn7X5M2zz24ftNi14zVWFzvr4UZ6LDXM9+Pym4WBPs4ziy7DTPf1JY
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8Ev7RRU0N+0kl8bk7KCyo48twNRgif4qi/7mJD1gI9bkq2EzgVf+yagVi0ZZ+XPT
IhwqAdiMSGg4hGtJRfxi4DOS1qBSrsUJcQYahMRlRUjib03XYqcffs9IZPRvRsJK
y2Cn3/VVt6DsohiWmXNY1o2fHTxQGIObKkBYFV8izG7qbj89EICjTxikm5F+RS7k
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suOCUkrEz1mfAAABoUijVWEAAAQDAEYwRAIgBZJ8THKHE3oLAxFQ12Ioucipd05+
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CSqGSIb3DQEBCwUAA4ICAQBTSkCVQ6015V1ZmUAPWJD9UiGmdQ94OJegJvcT8FNn
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q+XNy0RNYSjjJ+6JlxRhXPj2ip93kMLgiaNaQHuxCGEjigs7pZpLkFoDWWlud+Ga
KE6sedrdDJUW6W/ijSnkX3YqEaIQz0vR6xyljfMROw6cfvEWiinjcObccTHTRCBv
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eUlTkE4040jwGpy7E10PPHBoHofUaLTD+XvEtdECou2o9lalqjAw1vIAZbV5cP1D
m/sPIblJJmC1IhStkLlTjbc1Y9OcKQ3OWm4IqxVrb++QkJzMuBEPdzysZq8gZ7I0
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aA==
-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-11-09T03:02:09+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=PL O=Asseco Data Systems S.A. CN=Certum DV TLS G2 R39 CA
Issuer
C=PL O=Asseco Data Systems S.A. OU=Certum Certification Authority CN=Certum Trusted Root CA
Valid from
2024-06-18T07:41:22+00:00
Expires
2039-06-05T07:41:22+00:00
Days remaining
4591
Serial (hex)
A82DD9E5DCAFDF13205E70043E6B95A8
Signature
RSA-SHA512
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

83:C0:A5:A7:68:44:C8:40:DF:AF:82:0F:FD:02:AD:F6:57:3A:26:82:3E:F6:AF:75:8A:33:84:A0:AC:04:40:83
Certificate extensions & PEM
authorityInfoAccess
CA Issuers - URI:http://subca.repository.certum.pl/ctrca.cer OCSP - URI:http://subca.ocsp-certum.com
authorityKeyIdentifier
8C:FB:1C:75:BC:02:D3:9F:4E:2E:48:D9:F9:60:54:AA:C4:B3:4F:FA
basicConstraints
CA:TRUE, pathlen:0
crlDistributionPoints
Full Name: URI:http://subca.crl.certum.pl/ctrca.crl
extendedKeyUsage
TLS Web Client Authentication, TLS Web Server Authentication
keyUsage
Certificate Sign, CRL Sign
certificatePolicies
Policy: X509v3 Any Policy
subjectKeyIdentifier
33:A8:77:B7:01:38:6F:5F:1F:24:24:A2:1E:6C:14:E3:6E:22:03:DF
-----BEGIN CERTIFICATE-----
MIIGnTCCBIWgAwIBAgIRAKgt2eXcr98TIF5wBD5rlagwDQYJKoZIhvcNAQENBQAw
ejELMAkGA1UEBhMCUEwxITAfBgNVBAoTGEFzc2VjbyBEYXRhIFN5c3RlbXMgUy5B
LjEnMCUGA1UECxMeQ2VydHVtIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MR8wHQYD
VQQDExZDZXJ0dW0gVHJ1c3RlZCBSb290IENBMB4XDTI0MDYxODA3NDEyMloXDTM5
MDYwNTA3NDEyMlowUjELMAkGA1UEBhMCUEwxITAfBgNVBAoMGEFzc2VjbyBEYXRh
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PtYwxP1nNpxwBgtIPoTk6wIDAQABo4IBRDCCAUAwcQYIKwYBBQUHAQEEZTBjMDcG
CCsGAQUFBzAChitodHRwOi8vc3ViY2EucmVwb3NpdG9yeS5jZXJ0dW0ucGwvY3Ry
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HnDrA8Y4pv0lvxLzSAC4ejGavMXqPTXHA+DEh9kHNd8tVlo24+6YN96Gspb1kMXR
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pSmHRHI3UWVERDeERca0uJ3I+a5ER9vUL9u5ilGG4afyx7QwzitBG+1rU3nRsHyZ
g6osILL/MWc0AbWJMyKzQ9Guj+uwq47h6BC9BsWF34pJeDC8EuN3HNxPlSWSII9l
Omwtipvq0EL1iocJhXdlsG+jIUVs/Sl/Um9JiZV+h/MoytnrPrWMIj+0zz6BdaPP
2sT6wcLzpnwYcE9FWSbQrzNpL283EOUkObjc8AIxICzPHGusF0IqsO+sj9XzvLTh
TjKfFlzx4NR8gbK7m8sXq6cgP4UAtyvDswebFIRQiuhjqOT9G7+56+4zC0RaEZx/
LwoFE+ObVXxX674szQvIc+7WPCooVsUbwZIikzJqZb4gJQ1OQx23CgyyYlsPHIDN
8FpPkganuCwy++7umTkM7+Q=
-----END CERTIFICATE-----

Chain certificate 2

Subject
C=PL O=Asseco Data Systems S.A. OU=Certum Certification Authority CN=Certum Trusted Root CA
Issuer
C=PL O=Asseco Data Systems S.A. OU=Certum Certification Authority CN=Certum Trusted Root CA
Valid from
2018-03-16T12:10:13+00:00
Expires
2043-03-16T12:10:13+00:00
Days remaining
5971
Serial (hex)
1EBF5950B8C980374C06F7EB554FB5ED
Signature
RSA-SHA512
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

FE:76:96:57:38:55:77:3E:37:A9:5E:7A:D4:D9:CC:96:C3:01:57:C1:5D:31:76:5B:A9:B1:57:04:E1:AE:78:FD
Certificate extensions & PEM
basicConstraints
CA:TRUE
subjectKeyIdentifier
8C:FB:1C:75:BC:02:D3:9F:4E:2E:48:D9:F9:60:54:AA:C4:B3:4F:FA
keyUsage
Certificate Sign, CRL Sign
-----BEGIN CERTIFICATE-----
MIIFwDCCA6igAwIBAgIQHr9ZULjJgDdMBvfrVU+17TANBgkqhkiG9w0BAQ0FADB6
MQswCQYDVQQGEwJQTDEhMB8GA1UEChMYQXNzZWNvIERhdGEgU3lzdGVtcyBTLkEu
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P78v3DSk+yshzWePS/Tj6tQ/50+6uaWTRRxmHyH6ZF5v4HaUMst19W7l9o/HuKTM
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0ISVoDwUQwbKytu4QTbaakRnh6+v40URFWkIsr4WOZckbxJF0WddCajJFdr60qZf
E2Efv4WstK2tBZQIgx51F9NxO5NQI1mg7TyRVJ12AMXDuDjb
-----END CERTIFICATE-----

One endpoint on port 443. Server-presented chain; no revocation, OCSP, CT or full TLS security scan.

View certificate JSON

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