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
The certificate expires within 30 days.

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
2025-10-25T10:58:55+00:00
Expires
2026-10-25T10:58:54+00:00
Days remaining
10
Serial (hex)
5ABBDA7CF9B9B029BABC6EC54683D2D1
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

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

SHA-256 fingerprint

89:7A:67:4A:22:5F:F1:95:AD:65:22:70:7F:C5:CC:22:DE:9A:EC:E4:E1:B3:52:92:88:D3:31:29:AC:7C:B6:86
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 : D7:6D:7D:10:D1:A7:F5:77:C2:C7:E9:5F:D7:00:BF:F9: 82:C9:33:5A:65:E1:D0:B3:01:73:17:C0:C8:C5:69:77 Timestamp : Oct 25 10:58:56.681 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:24:20:97:1E:DA:8D:3C:86:79:A3:D0:DB: 98:D0:09:11:1B:8D:D4:19:75:A6:D1:FE:73:BC:58:26: 47:4F:F4:54:02:20:6B:79:A3:6B:45:72:D7:B7:68:19: 30:53:5C:1E:B3:56:11:4D:6E:83:81:7F:BB:6F:B7:5B: 04:AD:2D:CA:B7:70 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AC:AB:30:70:6C:EB:EC:84:31:F4:13:D2:F4:91:5F:11: 1E:42:24:43:B1:F2:A6:8C:4F:3C:2B:3B:A7:1E:02:C3 Timestamp : Oct 25 10:58:56.941 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:5B:4D:5C:6B:E6:BE:A5:87:DC:47:41:A1: 55:34:66:58:9C:93:BA:B5:99:E2:F5:60:DB:EC:E5:3B: 33:71:86:5B:02:21:00:DC:0B:B0:22:76:D2:49:CC:8B: 59:D6:53:2B:AA:36:1C:6B:E3:33:CB:A3:92:FD:D2:C2: D9:6D:08:E9:9F:16:69 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : C2:31:7E:57:45:19:A3:45:EE:7F:38:DE:B2:90:41:EB: C7:C2:21:5A:22:BF:7F:D5:B5:AD:76:9A:D9:0E:52:CD Timestamp : Oct 25 10:58:57.105 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:7C:92:8E:E6:3C:20:20:CC:74:DD:08:49: E7:66:E2:40:6B:2F:D1:EF:03:9E:25:CC:DD:F5:77:C3: F5:F0:81:EF:02:21:00:A7:05:25:A5:7D:90:2C:21:ED: E8:A9:6B:6E:01:9F:D4:78:5A:9E:34:85:A9:89:EB:16: 43:6D:98:7F:57:C1:13
-----BEGIN CERTIFICATE-----
MIIHDjCCBPagAwIBAgIQWrvafPm5sCm6vG7FRoPS0TANBgkqhkiG9w0BAQsFADBS
MQswCQYDVQQGEwJQTDEhMB8GA1UECgwYQXNzZWNvIERhdGEgU3lzdGVtcyBTLkEu
MSAwHgYDVQQDDBdDZXJ0dW0gRFYgVExTIEcyIFIzOSBDQTAeFw0yNTEwMjUxMDU4
NTVaFw0yNjEwMjUxMDU4NTRaMBcxFTATBgNVBAMMDCouemktdGVsLmNvbTCCASIw
DQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAJZG/a0E8/2TqmNzuKsxU4tZO95t
365BbFF8Gra+kFTM6MclxkAWsUAIArOCxz/rvOxVWZhmipxIkgcuADc+bWGZFzku
HmM0PWh1eFk42DcmPXpqOfV5tgoZGYCcmvL271EmF5v0hy/CUzFTT4zrfg/lPojQ
1Y31ua7vaAwwoxDZWAiuKjfw+VWeEpKx6sk9HJOKqJog5FWUZ7aVGz5K15xtOiRY
Vypl03fU9H/rQpWeXqvURP1YmTAl4SSE2nZHi1GVQ4rWnUVCUkMNgwniDm7E5QHV
FvmSdZG7HsTiftxoz07axnvp4I07Qt/ZQ9sR2lNw1PrUovCS32p1W/xPCysCAwEA
AaOCAxkwggMVMAwGA1UdEwEB/wQCMAAwTwYDVR0fBEgwRjBEoEKgQIY+aHR0cDov
L2NlcnR1bWR2dGxzZzJyMzljYS5jcmwuY2VydHVtLnBsL2NlcnR1bWR2dGxzZzJy
MzljYS5jcmwwgZoGCCsGAQUFBwEBBIGNMIGKMDUGCCsGAQUFBzABhilodHRwOi8v
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FONuIgPfMCEGA1UdIAQaMBgwCAYGZ4EMAQIBMAwGCiqEaAGG9ncCZQEwHQYDVR0l
BBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMA4GA1UdDwEB/wQEAwIFoDAjBgNVHREE
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bQSCAWkBZwB1ANdtfRDRp/V3wsfpX9cAv/mCyTNaZeHQswFzF8DIxWl3AAABmhsF
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NGZYnJO6tZni9WDb7OU7M3GGWwIhANwLsCJ20knMi1nWUyuqNhxr4zPLo5L90sLZ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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-15T08:34:26+00:00

Server-presented chain · 1 additional certificate

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
4615
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-----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H5o7DtoGiWXvcRKYpGtWt9czdUa1edSk5mTrwZGEXLAkX1ECiAq4GS5vEGjrEQ1u
x8mag2LDh7ZnXdcyzkKZKGsx7uExe3Nx5gWWZMXFrZ5v+uxynKogHUY2vdIMB3dn
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PtYwxP1nNpxwBgtIPoTk6wIDAQABo4IBRDCCAUAwcQYIKwYBBQUHAQEEZTBjMDcG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DnS5YKMldiLMkVW1Noskd4dHEJ2mkJcVzJIJ0Y4johA1lC1JnZMjkB8ZTNIblkgJ
K6PqlhYkeMOkx+XbmUuUgh29T0sPne7/V6PHnbEJIxUs40+iLCF0HrdqZypjvWQq
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-----

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

View certificate JSON

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