Network diagnostics toolkit

Nine self-contained tools for checking DNS, connectivity, and mail configuration. No third-party APIs, no external accounts.

Reverse IP Lookup

Find all sites hosted on a given server.

A complete report on a domain's DNS settings.

Visualize round-trip latency to a host.

Trace the hops between this server and a remote host.

Check whether recent DNS changes have propagated across major resolvers.

Find all sites that use a given mail server.

Detailed WHOIS registration information for a domain.

View the reverse DNS (PTR) entry for an IP address.

Determine if a domain is a well-known free/consumer email provider.