Is It Down

Website domain

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How it works

The server resolves the domain and requests the site, reporting DNS resolution, connection and HTTP response status.

Safeguards & responsible use

  • Server-side input validation: only syntactically valid hostnames and IP addresses are accepted.
  • Private, loopback, link-local and reserved address ranges are blocked to protect internal infrastructure.
  • Per-client rate limiting and request timeouts.

Frequently asked questions

The site works for you but not for me — why?

Common causes are local DNS caching, your ISP, a firewall or browser extensions. Try another network or flush your DNS cache.

Does this monitor sites continuously?

No, it is a one-time check. Continuous monitoring is a separate feature under consideration.