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

TLSv1.2

ns1.telnetwork.it · 195.36.1.100:443

Unverified
Certificate verification failed. These are unverified certificate details presented by the server. SSL operation failed with code 1. OpenSSL Error messages: error:0A000086:SSL routines::certificate verify failed

Certificate verification failed

Subject
C=IT ST=Pavia O=Telnet CN=telnetwork.it
Issuer
C=IT ST=Pavia O=Telnet CN=Telnet Intermediate 2019-01-24
Valid from
2022-12-16T08:46:10+00:00
Expires
2029-01-20T08:46:10+00:00
Days remaining
849
Serial (hex)
1F
Signature
ecdsa-with-SHA256
Public key
RSA 4096

Subject alternative names (SAN)

DNS:telnetwork.it, DNS:*.telnetwork.it, DNS:*.dyn.telnetwork.it, DNS:*.hosting.telnetwork.it, DNS:*.sip.telnetwork.it, DNS:*.pavia-1.telnetwork.it, DNS:telnetwork.eu, DNS:*.telnetwork.eu, DNS:*.dyn.telnetwork.eu, DNS:*.hosting.telnetwork.eu, DNS:*.sip.telnetwork.eu, DNS:*.pavia-1.telnetwork.eu, DNS:telnetwork.net, DNS:*.telnetwork.net, DNS:*.dyn.telnetwork.net, DNS:*.hosting.telnetwork.net, DNS:*.sip.telnetwork.net, DNS:*.pavia-1.telnetwork.net, DNS:telnetwork.org, DNS:*.telnetwork.org, DNS:*.dyn.telnetwork.org, DNS:*.hosting.telnetwork.org, DNS:*.sip.telnetwork.org, DNS:*.pavia-1.telnetwork.org, DNS:telnet.it, DNS:*.telnet.it, DNS:*.dyn.telnet.it, DNS:*.hosting.telnet.it, DNS:*.sip.telnet.it, DNS:*.pavia-1.telnet.it

SHA-256 fingerprint

4D:65:32:76:D8:56:63:14:A7:90:3C:B9:F4:C2:6B:A4:61:5D:51:18:14:8D:49:9B:07:42:2A:E6:67:28:C5:89
Certificate extensions & PEM
basicConstraints
CA:FALSE
nsCertType
SSL Server
nsComment
Server Certificate
subjectKeyIdentifier
EF:DA:FA:14:76:B7:A5:13:DE:91:56:99:E0:F9:F3:F9:A2:BB:C3:EE
authorityKeyIdentifier
keyid:BB:45:F5:BC:90:98:4C:93:78:1F:03:1C:A2:15:4E:D2:6E:06:D2:88 DirName:/C=IT/ST=Pavia/O=Telnet/CN=Telnet Root CA 2019-01-24 serial:14
keyUsage
Digital Signature, Key Encipherment
extendedKeyUsage
TLS Web Server Authentication
subjectAltName
DNS:telnetwork.it, DNS:*.telnetwork.it, DNS:*.dyn.telnetwork.it, DNS:*.hosting.telnetwork.it, DNS:*.sip.telnetwork.it, DNS:*.pavia-1.telnetwork.it, DNS:telnetwork.eu, DNS:*.telnetwork.eu, DNS:*.dyn.telnetwork.eu, DNS:*.hosting.telnetwork.eu, DNS:*.sip.telnetwork.eu, DNS:*.pavia-1.telnetwork.eu, DNS:telnetwork.net, DNS:*.telnetwork.net, DNS:*.dyn.telnetwork.net, DNS:*.hosting.telnetwork.net, DNS:*.sip.telnetwork.net, DNS:*.pavia-1.telnetwork.net, DNS:telnetwork.org, DNS:*.telnetwork.org, DNS:*.dyn.telnetwork.org, DNS:*.hosting.telnetwork.org, DNS:*.sip.telnetwork.org, DNS:*.pavia-1.telnetwork.org, DNS:telnet.it, DNS:*.telnet.it, DNS:*.dyn.telnet.it, DNS:*.hosting.telnet.it, DNS:*.sip.telnet.it, DNS:*.pavia-1.telnet.it
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Cipher: ECDHE-RSA-AES256-GCM-SHA384 · Checked 2026-09-23T11:22:48+00:00

Server-presented chain · 2 additional certificates

Chain certificate 1

Subject
C=IT ST=Pavia O=Telnet CN=Telnet Intermediate 2019-01-24
Issuer
C=IT ST=Pavia O=Telnet CN=Telnet Root CA 2019-01-24
Valid from
2019-01-24T17:01:34+00:00
Expires
2029-01-21T17:01:34+00:00
Days remaining
851
Serial (hex)
14
Signature
ecdsa-with-SHA256
Public key
EC 384 secp384r1

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

16:64:B7:02:A4:AB:8B:88:85:C3:68:C4:55:91:74:1D:C6:13:E1:AE:34:77:0B:A3:62:07:73:17:A1:A4:EB:69
Certificate extensions & PEM
subjectKeyIdentifier
BB:45:F5:BC:90:98:4C:93:78:1F:03:1C:A2:15:4E:D2:6E:06:D2:88
authorityKeyIdentifier
1F:10:FE:F3:A4:F1:2B:EF:B8:34:25:DD:00:49:79:D9:89:F3:D0:71
basicConstraints
CA:TRUE, pathlen:0
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

Chain certificate 2

Subject
C=IT ST=Pavia O=Telnet CN=Telnet Root CA 2019-01-24
Issuer
C=IT ST=Pavia O=Telnet CN=Telnet Root CA 2019-01-24
Valid from
2019-01-24T17:01:27+00:00
Expires
2029-01-24T17:01:27+00:00
Days remaining
854
Serial (hex)
C5EEFE0133AAD35D
Signature
ecdsa-with-SHA256
Public key
EC 384 secp384r1

Subject alternative names (SAN)

No SAN extension was presented.

SHA-256 fingerprint

EA:D0:52:41:DB:0B:FB:26:97:7F:B2:2E:B7:70:9F:DA:CE:78:B6:38:97:0A:1E:77:96:90:F1:E6:80:A8:7B:48
Certificate extensions & PEM
subjectKeyIdentifier
1F:10:FE:F3:A4:F1:2B:EF:B8:34:25:DD:00:49:79:D9:89:F3:D0:71
authorityKeyIdentifier
1F:10:FE:F3:A4:F1:2B:EF:B8:34:25:DD:00:49:79:D9:89:F3:D0:71
basicConstraints
CA:TRUE
keyUsage
Digital Signature, Certificate Sign, CRL Sign
-----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 →