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

TLSv1.2

dns.twmail.org · 210.59.228.119:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. Peer certificate CN=`*.url.com.tw' did not match expected CN=`dns.twmail.org'

Certificate verification failed

Subject
C=TW L=Taipei O=易達網股份有限公司 CN=*.url.com.tw
Issuer
C=PL O=Asseco Data Systems S.A. CN=Certum OV TLS G2 R39 CA
Valid from
2026-05-14T07:41:42+00:00
Expires
2026-11-29T07:41:41+00:00
Days remaining
59
Serial (hex)
3FE363976F2F33AED418B02393DA22D2
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:*.url.com.tw, DNS:url.com.tw

SHA-256 fingerprint

5F:A2:85:F0:27:7E:2B:5E:46:E8:F8:21:6C:46:A1:04:EB:4A:1F:EC:75:21:40:80:3E:32:E0:3F:33:28:0A:E5
Certificate extensions & PEM
basicConstraints
CA:FALSE
crlDistributionPoints
Full Name: URI:http://certumovtlsg2r39ca.crl.certum.pl/certumovtlsg2r39ca.crl
authorityInfoAccess
OCSP - URI:http://certumovtlsg2r39ca.ocsp-certum.com CA Issuers - URI:http://certumovtlsg2r39ca.repository.certum.pl/certumovtlsg2r39ca.cer
authorityKeyIdentifier
E8:79:07:6D:8D:83:FB:9A:79:63:63:BC:A5:32:63:B3:05:41:72:A9
certificatePolicies
Policy: 2.23.140.1.2.2 Policy: 1.2.616.1.113527.2.101.2
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
keyUsage
Digital Signature, Key Encipherment
subjectAltName
DNS:*.url.com.tw, DNS:url.com.tw
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : AF:67:88:3B:57:B0:4E:DD:8F:A6:D9:7E:F6:2E:A8:EB: 81:0A:C7:71:60:F0:24:5E:55:D6:0C:2F:E7:85:87:3A Timestamp : May 14 07:41:43.478 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:65:52:74:18:DF:C6:9F:D3:38:0A:D8:AE: B9:27:E1:97:BA:7E:D3:63:0F:63:15:BE:C7:21:AC:94: B7:84:4B:BE:02:21:00:FA:D2:B8:AA:FD:5C:A1:F1:2D: E5:DF:E6:2C:05:D3:E2:90:13:46:90:BE:E5:6F:FF:6D: 87:A3:43:DC:61:B4:BF Signed Certificate Timestamp: Version : v1 (0x0) Log ID : D8:09:55:3B:94:4F:7A:FF:C8:16:19:6F:94:4F:85:AB: B0:F8:FC:5E:87:55:26:0F:15:D1:2E:72:BB:45:4B:14 Timestamp : May 14 07:41:43.458 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:21:00:B8:A4:C9:B1:4C:C2:11:2D:B8:3E:0B: 2E:70:B7:C7:BF:E6:E8:28:8E:E8:3A:83:71:07:63:D3: DC:42:33:A6:C9:02:20:1F:E2:38:D1:6B:A0:FA:64:D9: B6:AD:DB:04:56:02:23:0E:CB:F2:DF:2A:FE:86:80:F7: A8:00:16:E7:5E:7C:07 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 : May 14 07:41:43.512 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:46:02:21:00:DC:B2:10:E1:7C:D6:F9:89:47:34:0B: 37:00:21:A2:A3:84:FD:8A:79:79:E7:45:67:9B:9F:0E: 8E:6A:2B:D0:A6:02:21:00:CF:5D:75:63:3D:37:85:29: 8F:4D:ED:E1:D4:13:A3:5D:B8:BC:9B:FA:EC:C7:71:C2: D7:D3:57:24:3B:24:4C:A9
-----BEGIN CERTIFICATE-----
MIIIVDCCBjygAwIBAgIQP+Njl28vM67UGLAjk9oi0jANBgkqhkiG9w0BAQsFADBS
MQswCQYDVQQGEwJQTDEhMB8GA1UECgwYQXNzZWNvIERhdGEgU3lzdGVtcyBTLkEu
MSAwHgYDVQQDDBdDZXJ0dW0gT1YgVExTIEcyIFIzOSBDQTAeFw0yNjA1MTQwNzQx
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ZWkxJDAiBgNVBAoMG+aYk+mBlOe2suiCoeS7veaciemZkOWFrOWPuDEVMBMGA1UE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cjM5Y2EuY2VyMB8GA1UdIwQYMBaAFOh5B22Ng/uaeWNjvKUyY7MFQXKpMCEGA1Ud
IAQaMBgwCAYGZ4EMAQICMAwGCiqEaAGG9ncCZQIwHQYDVR0lBBYwFAYIKwYBBQUH
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b20udHeCCnVybC5jb20udHcwggF/BgorBgEEAdZ5AgQCBIIBbwSCAWsBaQB2AK9n
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cQdj09xCM6bJAiAf4jjRa6D6ZNm2rdsEVgIjDsvy3yr+hoD3qAAW5158BwB3ANdt
fRDRp/V3wsfpX9cAv/mCyTNaZeHQswFzF8DIxWl3AAABniVvLNgAAAQDAEgwRgIh
ANyyEOF81vmJRzQLNwAhoqOE/Yp5eedFZ5ufDo5qK9CmAiEAz111Yz03hSmPTe3h
1BOjXbi8m/rsx3HC19NXJDskTKkwDQYJKoZIhvcNAQELBQADggIBAJZOAkrdaQAT
hnp2Th0y2EI8Jhsq91NYxWkD/gv/EfngTLLCqpwKvZ++Op/NPjKWpI91Q6zfACCG
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GUy94d7EDD1OgvQlHMDdcfgYUWBnHbB9Vh7M/rrcmZ9dXrcmpAtj10U1fTwwp0wR
4HaKyLIY+oAr/czbdu3pTtOp2FBWanucUksSS9mKfYlYI0cXByTsdcKoZpi/1okN
H033fsNreiMEhwvx6zLAty+L99U6ZQAo/o7B//u/Q+Q2uX2IRg9qRIUOTI4hXfQp
nI37qWIlWuXSKYhPBpUiZA7JJILq6X8LZrzCqi16ItH45q54RTZ+wxY0ScUtwwdi
uO9uymFNYki38TCRDQdBSZumnqRyAgxicHiX+5Sw4g/hPhOBY9I2KCMCNZyqQel0
l/2BLjRxAvHecLA2ObcMf4hqVVshYvh1EaHsIx/1cAyrj5mi8i9hiKj5tiBHZ1Xr
t9XfoXiEFEmGtrdzmS7XAr130VWhV35wGT1bmie+N/5/PY0AbHFzf4dMs8WQoWGX
C35tfXFGUEDey7cxA2OganViB+5s/OGW
-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-09-30T14:53:53+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=PL O=Asseco Data Systems S.A. CN=Certum OV TLS G2 R39 CA
Issuer
C=PL O=Asseco Data Systems S.A. OU=Certum Certification Authority CN=Certum Trusted Root CA
Valid from
2024-06-18T07:43:39+00:00
Expires
2039-06-05T07:43:39+00:00
Days remaining
4630
Serial (hex)
2F7B22589A0DFCE2307C2CD6410DA5D1
Signature
RSA-SHA512
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

F5:4C:E2:1E:A0:F7:95:48:F1:20:1A:61:90:49:CA:15:F0:65:E4:9A:69:F2:6F:B9:CF:12:82:C7:EE:CF:9C:4C
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
E8:79:07:6D:8D:83:FB:9A:79:63:63:BC:A5:32:63:B3:05:41:72:A9
-----BEGIN CERTIFICATE-----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bC9jdHJjYS5jcmwwHQYDVR0lBBYwFAYIKwYBBQUHAwIGCCsGAQUFBwMBMA4GA1Ud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-----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=Unizeto Technologies S.A. OU=Certum Certification Authority CN=Certum Trusted Network CA
Valid from
2023-09-19T10:00:00+00:00
Expires
2028-09-19T10:00:00+00:00
Days remaining
719
Serial (hex)
D8E0744B5824919FBD08847DF72020FA
Signature
RSA-SHA512
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

FB:13:89:0C:7A:B1:4F:F7:B9:4B:27:14:50:3E:31:12:3B:FD:D3:40:FC:4D:97:97:43:16:6E:04:69:B4:7A:88
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
authorityKeyIdentifier
08:76:CD:CB:07:FF:24:F6:C5:CD:ED:BB:90:BC:E2:84:37:46:75:F7
keyUsage
Certificate Sign, CRL Sign
crlDistributionPoints
Full Name: URI:http://crl.certum.pl/ctnca.crl
authorityInfoAccess
OCSP - URI:http://subca.ocsp-certum.com CA Issuers - URI:http://repository.certum.pl/ctnca.cer
certificatePolicies
Policy: X509v3 Any Policy CPS: https://www.certum.pl/CPS
-----BEGIN CERTIFICATE-----
MIIFxDCCBKygAwIBAgIRANjgdEtYJJGfvQiEffcgIPowDQYJKoZIhvcNAQENBQAw
fjELMAkGA1UEBhMCUEwxIjAgBgNVBAoTGVVuaXpldG8gVGVjaG5vbG9naWVzIFMu
QS4xJzAlBgNVBAsTHkNlcnR1bSBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTEiMCAG
A1UEAxMZQ2VydHVtIFRydXN0ZWQgTmV0d29yayBDQTAeFw0yMzA5MTkxMDAwMDBa
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RGF0YSBTeXN0ZW1zIFMuQS4xJzAlBgNVBAsTHkNlcnR1bSBDZXJ0aWZpY2F0aW9u
IEF1dGhvcml0eTEfMB0GA1UEAxMWQ2VydHVtIFRydXN0ZWQgUm9vdCBDQTCCAiIw
DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBANEtjru3NuptN5GfTpOnBeQpAyXO
HIL3fJmfQQbN7aO6wNsJLMF83yl+S2Uvk6fUAWsDKBij2J0FwSrYRfGR3t870IAC
jM84D+qnXHgRpMHIhVwl09Oy5yXPEVSXqzXAHnYc7wBTnzncFKUsIiWzcnL8jbPl
PggeFCo3C4g8yrD0yMKhrrzBvilnVeL8rVlc/r1XLLCQjcLtN7Z8mYi11QOaPRUN
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vjC9gFC/fLXOAPYMYdnnJAPg4wGBDr3YhTSIvbI2qHtcCOVEgIxv+C/VIcodHND7
xLWH0TpOx3a1NUi1AgMBAAGjggE/MIIBOzAPBgNVHRMBAf8EBTADAQH/MB0GA1Ud
DgQWBBSM+xx1vALTn04uSNn5YFSqxLNP+jAfBgNVHSMEGDAWgBQIds3LB/8k9sXN
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BgEFBQcwAYYcaHR0cDovL3N1YmNhLm9jc3AtY2VydHVtLmNvbTAxBggrBgEFBQcw
AoYlaHR0cDovL3JlcG9zaXRvcnkuY2VydHVtLnBsL2N0bmNhLmNlcjA6BgNVHSAE
MzAxMC8GBFUdIAAwJzAlBggrBgEFBQcCARYZaHR0cHM6Ly93d3cuY2VydHVtLnBs
L0NQUzANBgkqhkiG9w0BAQ0FAAOCAQEAKPpdjKpRGqa+eIZpwndaFy+p4H1FT2wf
9JOJdmyjSkJ4wlUp+xbL6v7D6/6xYO8IcvyWyR1sdqef8HK49mYK9jDjk+ypq7IO
h8R9VbhSuS6KxY3X5lVV6vmYZ6QE4G8IuK9ktvGSVS4uNabf+/r+Gq9oiysCwsck
AsjwXbYN2gsKAWxXGC1vAqIOlB3tJaL29UVh2nKdl0eD7EsFwbk0vo/U5pQ/Yi8u
JJb/OSiK1XXUJ7S8wmURNWK2hIzHSnP9xotjmUJMVMb8Igj8jntZNc9U3lNuzG6R
F2kSR3FCgnCJ9AebGFZwEc7QDTCuohG6Lmb6D3Dtopv/LvqypxAmQQ==
-----END CERTIFICATE-----

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

View certificate JSON

Registration / WHOIS →DNS records →