Site Availability Check Online

The Site Availability tool on 101IP checks whether a website responds to HTTP and HTTPS requests. Results show HTTP status, response time and the redirect chain.

HTTP status codes explained

2xx — site is online and responding normally (200 OK, 204 No Content);
3xx — redirect (301 Moved Permanently, 302 Found) — site is reachable;
4xx — client error (403 Forbidden, 404 Not Found) — server is responding;
5xx — server error (500, 503) — site is down or broken;
No response — server does not respond, domain does not resolve or connection is refused.

Why check availability

Confirm the site is working after a deploy or server configuration change;
Check whether the site is reachable from a network other than your own ISP;
Verify that HTTP redirects to HTTPS;
Diagnose SSL certificate or server issues.

Frequently Asked Questions

What do HTTP status codes 301 and 302 mean in an availability check?

A 301 status indicates a permanent redirect — the page has definitively moved to a new URL. A 302 is a temporary redirect. The tool follows the full redirect chain and shows the final URL. Best practice is to keep the chain short (no more than 2–3 hops) and ensure it leads to an HTTPS URL returning 200 OK.
Why is the HTTPS response time longer than HTTP?

HTTPS requires an additional TLS handshake that can add 100–300 ms to the initial connection. If the difference is larger than 500 ms, the server may have a slow CPU, missing session resumption, or an outdated TLS protocol version. Enabling OCSP stapling and HTTP/2 can significantly reduce the overhead.
Does site downtime affect search engine rankings?

Yes, directly. Search engine crawlers (Google, Yandex) treat persistent 5xx errors and connection timeouts as a signal of an unreliable resource. If a site is unavailable for more than 24 hours it may drop in rankings or be temporarily removed from the index. Regular availability monitoring helps catch problems early and minimise SEO damage.