---
description: Restrict traffic to specific HTTP ports.
title: Require specific HTTP ports
image: https://developers.cloudflare.com/og-docs.png
---

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# Require specific HTTP ports

Last updated Aug 24, 2026|Copy as Markdown|[View as Markdown](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/waf/custom-rules/use-cases/require-specific-http-ports/index.md)|[Agent setup](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/agent-setup/)

By default, Cloudflare allows requests on a [number of different HTTP ports](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/fundamentals/reference/network-ports/).

You can target requests based on their HTTP port with the [cf.edge.server\_port](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/ruleset-engine/rules-language/fields/reference/cf.edge.server%5Fport/) field. Use the `in` [comparison operator](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/ruleset-engine/rules-language/operators/#comparison-operators) to target a set of ports.

This example [custom rule](https://docs-durable-objects-instance-replaced-errors.previews.developers.cloudflare.com/waf/custom-rules/create-dashboard/) blocks requests to `www.example.com` that are not on ports `80` or `443`:

* **When incoming requests match**:  
Use the expression editor:  
`(http.host eq "www.example.com" and not cf.edge.server_port in {80 443})`
* **Then take action**: _Block_

Open server ports and blocked traffic

Due to the nature of Cloudflare's anycast network, ports other than `80` and `443` will be open so that Cloudflare can serve traffic for other customers on these ports. In general, Cloudflare makes available several different products on [Cloudflare IPs ↗](https://www.cloudflare.com/ips), so you can expect tools like Netcat and security scanners to report these non-standard ports as open in specific conditions. If you have questions on security compliance, review [Cloudflare's certifications and compliance resources ↗](https://www.cloudflare.com/en-gb/trust-hub/compliance-resources/) and contact your Cloudflare enterprise account manager for more information.

Custom rules and WAF Managed Rules can block traffic at the application layer (layer 7 in the [OSI model ↗](https://www.cloudflare.com/learning/ddos/glossary/open-systems-interconnection-model-osi/)), preventing HTTP/HTTPS requests over non-standard ports from reaching the origin server.

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