In short. Configure Fallback Behavior under Rank Math SEO → General Settings → Redirections after enabling the Redirections module.
Definition: As of October 2026, Rank Math's redirect fallback controls what happens when a missing-page request has no matching redirection. It can leave the default 404 response, redirect to the homepage, or redirect to a custom URL.
Key facts
- Rank Math's redirection setup guide requires Advanced Mode and an enabled Redirections module.
- Rank Math's General Settings guide places the controls under Rank Math SEO → General Settings → Redirections.
- The plugin's settings definition labels the choices Default 404, Redirect to Homepage, and Custom Redirection.
- Rank Math's redirector implementation checks for a missing-page request before applying fallback.
Where are the fallback settings?
Rank Math's setup guide identifies the module switch at WordPress Dashboard → Rank Math SEO → Dashboard → Modules. Advanced Mode makes the Redirections module available.
After module activation, the General Settings guide gives this settings path:
Rank Math SEO → General Settings → Redirections
The Fallback Behavior control belongs to these general redirection settings. The separate Redirections screen holds individual rules with source URLs and destinations, as the setup guide explains.
Which fallback option applies?
The settings definition sets Default 404 as the default choice. The corresponding configuration is:
Fallback Behavior: Default 404
With that selection, the redirector implementation returns from the fallback routine without creating a redirect. Redirect to Homepage uses the site's home URL. Custom Redirection uses the value in the custom URL field when that value is nonempty.
Rank Math's General Settings guide explains that selecting the custom option reveals an additional field for the fallback destination. The settings definition makes that field conditional on Custom Redirection.
When does fallback run?
A source URL is the address a redirection rule matches; a destination URL is the address it sends the visitor to. Rank Math's setup guide defines these fields in its redirection form.
The redirector source processes its preliminary checks, cache and rule matching before fallback. Its processing loop stops once a match exists. The fallback eligibility check requires WordPress's is_404() condition, which identifies a missing-page request. This makes an unmatched missing source request the relevant case for this setting.
Related terms
FAQ
Which option keeps the missing-page response?
Choose Default 404. Rank Math's redirector implementation exits the fallback routine for that selection.
Where do I enter a custom destination?
Choose Custom Redirection in Fallback Behavior. The settings definition then exposes the custom URL field.
Which redirect type does fallback use?
The redirector source uses the general Redirection Type setting when the match has no rule-specific response code. The settings definition defaults that setting to 301.
Sources
- Rank Math, "How to Set Up Redirections", undated
- Rank Math, "Rank Math General Settings", undated
- Rank Math, "Redirections general settings" (options.php), undated
- Rank Math, "The Redirector" (class-redirector.php), undated
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