IP & DNS Toolbox

Network diagnostics — IP, DNS, and mail-auth tools.

One page. Every lookup.

Inspect any domain or IP, all in one place.

A fast, no-nonsense set of network diagnostics. Find your public IP, dig into DNS records, verify your email authentication (SPF, DKIM, DMARC), trace mail routing, look up domain ownership, and crunch subnet math — powered by trusted public resolvers. No sign-ups, no tracking, and every tool is also a clean JSON API you can script against.

IP & DNS Toolbox
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Your public IP: … Script use: curl https://ip.pftx.us/plain