HTTP Status Codes List & Lookup

Look up any HTTP status code (200, 301, 404, 503…) with its meaning and SEO impact, or browse the full list.

What do HTTP status codes mean?

An HTTP status code is the three-digit number a server returns with every response. 1xx are informational, 2xx mean success, 3xx are redirects, 4xx are client errors (such as 404 Not Found) and 5xx are server errors (such as 503 Service Unavailable).

The codes that matter for SEO

Code	Use it when
200	The page exists and should be indexed.
301 / 308	A page moved permanently — passes ranking signals.
302 / 307	A temporary move — the old URL stays indexed.
404	The page does not exist.
410	The page was removed on purpose — dropped from the index faster.
503	Planned maintenance — Google retries later.

Type a code (404), a class (3xx) or a word (redirect, timeout) to filter. To see which code a real URL returns, use the HTTP Status Code Checker.

Frequently asked questions

What is the difference between 301 and 302?

301 is permanent and transfers SEO value; 302 is temporary and keeps the original URL indexed.

What causes a 502 Bad Gateway?

A proxy or CDN received an invalid response from the origin server — often a crashed PHP or app process.

What are 520–526 errors?

Cloudflare-specific codes for problems between Cloudflare and your origin server.