In case you need to check a particular site for HTTP status codes, you can enter its domain name into Site Explorer and navigate to Best by links report.

Once you have that, open the HTTP code dropdown filter above and select the needed HTTP code:

It will list you the pages that return the code you selected:

Please note that this report shows you the HTTP response codes of the pages recorded by our crawler at the day it visited the page (see Last check date in the last column):

This report can be particularly useful if you are running a broken link building campaign. You can find out more here:
https://ahrefs.com/blog/broken-link-building/

If you want to check the up-to-the-minute status of all the pages of your website, you can use our Site Audit tool.