Website Uptime Checker

Probe a URL for HTTP status, timing, TTFB, TLS, and public DNS resolver visibility.

HTTP status

TTFB timing

TLS timing

Resolver view

Fast timing

See DNS, connect, TLS, and first-byte timing.

Final URL

Confirm where redirects land.

DNS visibility

Compare public resolver answers.

Tool guide

Using the Uptime & TTFB Checker

This tool performs a quick public HTTP probe to see whether a page responds and how long the first response takes.

What this tool does

It checks HTTP status, final URL, DNS lookup time, connection time, TLS time, time to first byte, and resolver visibility.

Who it helps

Website owners checking whether a site is reachable
Developers comparing before and after optimization
Hosting users investigating slow first responses

Usage instructions

Enter a full URL or domain. Use the timing table to identify whether delays appear in DNS, connection, TLS, or server response.

Understanding the output

Slow TTFB points to server, application, cache, or upstream latency. Redirects and non-200 statuses should be reviewed if the page should be publicly available.

Why it matters for hosting

Performance and uptime are core hosting outcomes. UnderHost customers can use this after cache changes, DNS moves, SSL updates, or server migrations.