Website checks

Availability and speed tools for a whole site: status, timing breakdown and redirect chains.

Run a live HTTP request against any website and see status code, load time, first byte, redirects, server software and page size.

Trace every hop a URL takes, with status codes and timings, so you can find redirect loops and needless extra hops.

Break a request into DNS, TCP connect, TLS handshake and time to first byte, so you know which stage is slow.

Network tools DNS tools Security & TLS Email tools Domain tools All tools

Reference

Look something up without running a check.

What 301, 403, 502 and the rest actually mean, and how to fix them.

What listens on each port and whether it should ever face the internet.

ERR_CONNECTION_REFUSED, NXDOMAIN, SSL errors — decoded.

A, MX, TXT, CNAME and friends, with real examples.