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

o2.sk · 160.218.168.20:443

Verified

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

Subject
C=SK L=Bratislava O=O2 Slovakia, s.r.o. CN=*.o2.sk
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=Thawte TLS RSA CA G1
Valid from
2026-05-05T00:00:00+00:00
Expires
2026-11-19T23:59:59+00:00
Days remaining
47
Serial (hex)
052BD8484AE924AF80D325431E357C5B
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

DNS:*.o2.sk, DNS:o2.sk

SHA-256 fingerprint

61:C5:82:1D:BC:8A:CC:49:5D:53:BE:C1:1D:7C:88:B3:EA:6C:F4:75:78:91:D0:FA:71:7A:BF:A9:D2:6D:8C:D4
Certificate extensions & PEM
authorityKeyIdentifier
A5:8C:FE:32:CC:EB:0F:2C:D4:19:C6:08:B8:00:24:88:5D:C3:C5:B7
subjectKeyIdentifier
16:15:CC:60:37:82:02:72:96:49:4B:77:29:E2:F7:9D:9E:ED:00:B0
subjectAltName
DNS:*.o2.sk, DNS:o2.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, TLS Web Client Authentication
crlDistributionPoints
Full Name: URI:http://cdp.thawte.com/ThawteTLSRSACAG1.crl
authorityInfoAccess
OCSP - URI:http://status.thawte.com CA Issuers - URI:http://cacerts.thawte.com/ThawteTLSRSACAG1.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 5 09:15:56.344 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:44:02:20:04:2F:BC:90:19:53:9E:46:BE:CC:CC:01: 3B:72:37:F8:49:AB:98:3B:3E:B9:34:4B:60:94:90:EB: B9:5E:62:16:02:20:58:DE:4C:F0:F2:02:E4:20:50:E2: F4:5A:92:ED:E2:B2:14:76:67:65:59:28:E0:D0:F2:A1: D5:BB:FF:F7:5A:20 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 5 09:15:56.388 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:54:E7:BA:57:18:8D:FC:7D:49:2E:F1:F6: 43:B8:C3:3C:2B:86:75:87:CB:24:1E:D8:FF:44:72:39: 6F:4D:91:BE:02:21:00:9C:53:FD:65:9F:16:0C:7B:BE: 25:BD:C4:58:17:59:4D:E7:73:C7:24:C1:D3:5A:10:9C: 50:4E:C3:4B:D8:93:5E 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 5 09:15:56.358 2026 GMT Extensions: none Signature : ecdsa-with-SHA256 30:45:02:20:71:14:65:D7:F9:34:0F:4E:4A:93:B4:CA: D2:7F:A7:53:FB:C7:FB:17:D9:23:FC:A2:11:6D:F8:B0: 10:D4:53:BA:02:21:00:F1:CA:59:32:49:E7:EA:E5:50: A4:BC:8C:0B:AF:83:70:65:E5:60:8E:39:57:C9:67:77: 65:02:F8:C4:9F:BA:9F
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: TLS_AES_128_GCM_SHA256 · Checked 2026-10-03T13:52:47+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=US O=DigiCert Inc OU=www.digicert.com CN=Thawte TLS RSA CA G1
Issuer
C=US O=DigiCert Inc OU=www.digicert.com CN=DigiCert Global Root G2
Valid from
2017-11-02T12:24:25+00:00
Expires
2027-11-02T12:24:25+00:00
Days remaining
394
Serial (hex)
090EE8C5DE5BFA62D2AE2FF7097C4857
Signature
RSA-SHA256
Public key
RSA 2048

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

4B:CC:5E:23:4F:E8:1E:DE:4E:AF:88:3A:A1:9C:31:33:5B:0B:26:E8:5E:06:6B:99:45:E4:CB:61:53:EB:20:C2
Certificate extensions & PEM
subjectKeyIdentifier
A5:8C:FE:32:CC:EB:0F:2C:D4:19:C6:08:B8:00:24:88:5D:C3:C5:B7
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
basicConstraints
CA:TRUE, pathlen:0
authorityInfoAccess
OCSP - URI:http://ocsp.digicert.com
crlDistributionPoints
Full Name: URI:http://crl3.digicert.com/DigiCertGlobalRootG2.crl
certificatePolicies
Policy: X509v3 Any Policy CPS: https://www.digicert.com/CPS
-----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
4121
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 →