TCP Port Check
Check if a TCP port is open, with banner-grab when the service speaks first.
About this tool
Probes a TCP port and reports open / closed / filtered. For services that send a banner immediately (SMTP, FTP, SSH, IRC), the banner is captured and returned. UDP and raw scanning are not supported.
Related tools
Connectivity
SSL/TLS Certificate Checker
Inspect a server's TLS certificate — expiry, issuer, SANs, chain, protocol.
Connectivity
HTTP Headers Inspector
Fetch a URL and inspect response headers, status, and redirect chain.
Email
MX Record Lookup
Resolve MX, forward-resolve each, check PTR, and probe SMTP ports.