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

mail.tds.net · 129.159.94.43:443

Verified

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

Subject
C=US ST=Wisconsin O=TELEPHONE AND DATA SYSTEMS Inc CN=mail.tds.net
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA OV R36
Valid from
2025-12-31T00:00:00+00:00
Expires
2027-01-16T23:59:59+00:00
Days remaining
98
Serial (hex)
7DA32077D15074E4E5D918068D2E5C7D
Signature
RSA-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:mail.tds.net, DNS:imap.tds.net, DNS:mail2.tds.net, DNS:mx.tds.net, DNS:smtp.tds.net

SHA-256 fingerprint

AA:90:76:D9:C0:B9:62:6A:A7:06:F8:6B:B8:CE:5B:E6:76:73:BF:C0:78:61:67:FB:54:D0:AA:52:D2:EC:78:02
Certificate extensions & PEM
authorityKeyIdentifier
E3:66:74:BB:70:68:8D:2C:5D:4E:0E:A6:4A:8F:9B:37:22:9C:82:92
subjectKeyIdentifier
AF:80:D6:C4:F5:5F:99:61:95:BF:F6:B6:7F:28:BC:4B:50:F1:35:6D
keyUsage
Digital Signature, Key Encipherment
basicConstraints
CA:FALSE
extendedKeyUsage
TLS Web Server Authentication
certificatePolicies
Policy: 1.3.6.1.4.1.6449.1.2.1.3.4 CPS: https://sectigo.com/CPS Policy: 2.23.140.1.2.2
crlDistributionPoints
Full Name: URI:http://crl.sectigo.com/SectigoPublicServerAuthenticationCAOVR36.crl
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/SectigoPublicServerAuthenticationCAOVR36.crt OCSP - URI:http://ocsp.sectigo.com
ct_precert_scts
Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 60:4C:9A:AF:7A:7F:77:5F:01:D4:06:FC:92:0D:C8:99: EB:0B:1C:7D:F8:C9:52:1B:FA:FA:17:77:3B:97:8B:C9 Timestamp : Dec 31 17:41:21.877 2025 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:24:AA:C8:19:94:BA:4F:D3:55:20:0A:E2: D1:D4:A5:05:2B:BF:67:9B:66:06:0C:31:A3:6D:A0:AB: B3:5C:B6:92:02:21:00:9D:EA:30:C4:E3:EF:6C:CF:44: E3:04:55:60:35:EB:1D:94:B2:1D:F5:6C:DD:BD:AA:0C: 10:5A:17:E4:E3:E2:32 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 8E:CA:47:0B:AC:DE:6A:F3:A2:06:B0:A4:7A:84:B7:46: FE:1F:C6:BF:95:3E:25:E6:9B:4E:E4:02:48:F3:C6:E8 Timestamp : Dec 31 17:41:22.186 2025 GMT Extensions: 00:00:05:00:00:F0:73:66 Signature : ecdsa-with-SHA256 30:45:02:20:14:4F:CD:9B:5D:24:74:47:E7:6C:66:39: 09:0C:62:67:CC:DA:E0:A5:A1:EB:0E:0D:CD:C3:85:C3: 9D:D2:09:2B:02:21:00:CE:5F:0B:0A:C3:8E:E6:74:80: 4A:9C:29:64:DD:95:35:28:41:13:BB:84:F2:A7:0F:C6: 81:08:D6:BF:C1:16:8D Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 59:6E:6C:33:86:94:B2:59:72:A2:56:C8:A0:E8:DD:90: 4A:76:E8:08:3D:DA:87:3B:01:08:38:28:14:3C:EE:59 Timestamp : Dec 31 17:41:21.649 2025 GMT Extensions: 00:00:05:00:00:05:C5:39 Signature : ecdsa-with-SHA256 30:45:02:20:58:1A:37:75:62:CA:E9:A9:E0:34:44:55: E4:12:3C:02:13:70:6A:22:4A:F7:B8:AF:5B:FC:1B:C6: D8:23:C8:32:02:21:00:CF:2E:81:FF:DC:21:98:B0:51: CE:24:55:8F:4F:C8:AF:A0:BF:C6:E9:D1:15:E1:15:17: C1:1D:25:7E:99:5D:79
subjectAltName
DNS:mail.tds.net, DNS:imap.tds.net, DNS:mail2.tds.net, DNS:mx.tds.net, DNS:smtp.tds.net
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_256_GCM_SHA384 · Checked 2026-10-10T08:55:12+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication CA OV R36
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication Root R46
Valid from
2021-03-22T00:00:00+00:00
Expires
2036-03-21T23:59:59+00:00
Days remaining
3450
Serial (hex)
2C1A3C76E943DDDDFF191B31890AED71
Signature
RSA-SHA384
Public key
RSA 3072

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

65:42:D1:76:BE:D5:0F:19:3C:0C:E2:97:AE:44:EC:D8:A0:A8:6B:EC:2E:DE:68:27:69:34:40:59:B4:E7:85:30
Certificate extensions & PEM
authorityKeyIdentifier
56:73:58:64:95:F9:92:1A:B0:12:2A:04:62:79:A1:40:15:88:21:49
subjectKeyIdentifier
E3:66:74:BB:70:68:8D:2C:5D:4E:0E:A6:4A:8F:9B:37:22:9C:82:92
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE, pathlen:0
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
certificatePolicies
Policy: X509v3 Any Policy Policy: 2.23.140.1.2.2
crlDistributionPoints
Full Name: URI:http://crl.sectigo.com/SectigoPublicServerAuthenticationRootR46.crl
authorityInfoAccess
CA Issuers - URI:http://crt.sectigo.com/SectigoPublicServerAuthenticationRootR46.p7c OCSP - URI:http://ocsp.sectigo.com
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication Root R46
Issuer
C=GB O=Sectigo Limited CN=Sectigo Public Server Authentication Root R46
Valid from
2021-03-22T00:00:00+00:00
Expires
2046-03-21T23:59:59+00:00
Days remaining
7102
Serial (hex)
758DFD8BAE7C0700FAA925A7E1C7AD14
Signature
RSA-SHA384
Public key
RSA 4096

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

7B:B6:47:A6:2A:EE:AC:88:BF:25:7A:A5:22:D0:1F:FE:A3:95:E0:AB:45:C7:3F:93:F6:56:54:EC:38:F2:5A:06
Certificate extensions & PEM
subjectKeyIdentifier
56:73:58:64:95:F9:92:1A:B0:12:2A:04:62:79:A1:40:15:88:21:49
keyUsage
Digital Signature, Certificate Sign, CRL Sign
basicConstraints
CA:TRUE
-----BEGIN CERTIFICATE-----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-----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 →