Custom rules

Custom rules allow you to control incoming traffic by filtering requests to a zone. They work as customized web application firewall (WAF) rules that you can use to perform actions like Block or Managed Challenge on incoming requests. You can also use the Skip action in a custom rule to skip one or more Cloudflare security features.

In the new security dashboard, custom rules are one of the available types of security rules. Security rules perform security-related actions on incoming requests that match specified filters.

Like other rules evaluated by Cloudflare's Ruleset Engine, custom rules have the following basic parameters:

• An expression that specifies the criteria you are matching traffic on using the Rules language.
• An action that specifies what to perform when there is a match for the rule.

Custom rules are evaluated in order, and some actions like Block will stop the evaluation of other rules. For more details on actions and their behavior, refer to the actions reference.

To define sets of custom rules that apply to more than one zone, use custom rulesets, which require an Enterprise plan with a paid add-on.

Availability

	Free	Pro	Business	Enterprise
Availability	Yes	Yes	Yes	Yes
Number of rules	5	20	100	1,000
Supported actions	All except Log	All except Log	All except Log	All
Regex support	No	No	Yes	Yes
Custom rulesets	No	No	No	Paid add-on

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Next steps

Refer to the following pages for instructions on creating custom rules:

• Create a custom rule in the dashboard
• Create a custom rule via API
• WAF custom rules configuration using Terraform

For examples of using custom rules to address common use cases, refer to Common use cases.