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

telecom.sk · 213.81.204.245:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. Peer certificate CN=`*.telekom.sk' did not match expected CN=`telecom.sk'

Certificate verification failed

Subject
C=SK L=Bratislava O=Slovak Telekom, a.s. CN=*.telekom.sk
Issuer
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Valid from
2026-05-25T00:00:00+00:00
Expires
2026-12-09T23:59:59+00:00
Days remaining
68
Serial (hex)
0820185F8ED72B144427B9212F42D350
Signature
RSA-SHA256
Public key
RSA 3072

Subject alternative names (SAN)

DNS:*.telekom.sk, DNS:telekom.sk

SHA-256 fingerprint

FC:FB:5E:2E:85:68:42:FD:19:D4:EB:B5:FE:16:EA:2A:FE:7A:98:4F:22:28:A8:F5:F7:6B:26:79:07:B1:9B:CF
Certificate extensions & PEM
authorityKeyIdentifier
74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
subjectKeyIdentifier
41:5B:93:63:29:C6:5D:C7:2A:B8:77:DA:98:8F:3F:35:86:EE:DD:25
subjectAltName
DNS:*.telekom.sk, DNS:telekom.sk
certificatePolicies
Policy: 2.23.140.1.2.2 CPS: http://www.digicert.com/CPS
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl Full Name: URI:http://crl4.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crl
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalG2TLSRSASHA2562020CA1-1.crt
basicConstraints
CA:FALSE
ct_precert_scts
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 : May 25 12:02:09.281 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:41:95:02:5C:C6:68:9A:FC:F2:3C:F9:0F: A4:7A:CD:3E:BD:FE:FF:DD:22:3C:B9:4E:36:2E:29:A3: A5:D2:14:16:02:20:79:EC:6F:AF:DA:4F:AF:68:26:F1: F3:9E:13:24:CF:59:FF:33:37:6F:A3:C3:F9:19:C9:F8: 7B:53:A3:EB:40:27 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 25 12:02:09.325 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:1C:37:BE:0F:92:F3:FD:2F:59:DE:60:08: F3:82:21:DA:86:6E:6F:BD:78:58:E6:36:59:DA:01:42: CD:90:C9:FA:02:20:56:E0:32:D5:C4:EC:05:EE:26:90: 7B:1B:A0:FA:08:2E:79:55:8E:BD:A4:7C:52:BC:D8:8E: B7:54:17:99:D4:D6 Signed Certificate Timestamp: Version : v1 (0x0) Log ID : 94:4E:43:87:FA:EC:C1:EF:81:F3:19:24:26:A8:18:65: 01:C7:D3:5F:38:02:01:3F:72:67:7D:55:37:2E:19:D8 Timestamp : May 25 12:02:09.300 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:45:07:1B:6C:12:43:6B:99:91:E5:1C:68: 6A:2F:39:62:56:6F:B0:AA:96:56:22:A4:93:1D:7D:D8: B1:F9:9D:1C:02:20:4E:5A:E3:F4:F2:59:E6:EF:68:10: 5D:49:21:5D:BB:72:56:7E:7B:4D:D8:EF:27:9F:73:30: 6A:B7:E9:C2:8C:45
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_CHACHA20_POLY1305_SHA256 · Checked 2026-10-02T12:16:47+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=DigiCert Inc CN=DigiCert Global G2 TLS RSA SHA256 2020 CA1
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2021-03-30T00:00:00+00:00
Expires
2031-03-29T23:59:59+00:00
Days remaining
1639
Serial (hex)
0CF5BD062B5602F47AB8502C23CCF066
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

C8:02:5F:9F:C6:5F:DF:C9:5B:3C:A8:CC:78:67:B9:A5:87:B5:27:79:73:95:79:17:46:3F:C8:13:D0:B6:25:A9
Certificate extensions & PEM
basicConstraints
CA:TRUE, pathlen:0
subjectKeyIdentifier
74:85:80:C0:66:C7:DF:37:DE:CF:BD:29:37:AA:03:1D:BE:ED:CD:17
authorityKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
keyUsage
Digital Signature, Certificate Sign, CRL Sign
extendedKeyUsage
TLS Web Server Authentication, TLS Web Client Authentication
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com CA Issuers - URI:http://cacerts.digicert.com/DigiCertGlobalRootG2.crt
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalRootG2.crl
certificatePolicies
Policy: 2.16.840.1.114412.2.1 Policy: 2.23.140.1.1 Policy: 2.23.140.1.2.1 Policy: 2.23.140.1.2.2 Policy: 2.23.140.1.2.3
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2013-08-01T12:00:00+00:00
Expires
2038-01-15T12:00:00+00:00
Days remaining
4122
Serial (hex)
033AF1E6A711A9A0BB2864B11D09FAE5
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

CB:3C:CB:B7:60:31:E5:E0:13:8F:8D:D3:9A:23:F9:DE:47:FF:C3:5E:43:C1:14:4C:EA:27:D4:6A:5A:B1:CB:5F
Certificate extensions & PEM
basicConstraints
CA:TRUE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
subjectKeyIdentifier
4E:22:54:20:18:95:E6:E3:6E:E6:0F:FA:FA:B9:12:ED:06:17:8F:39
-----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 →