---
title: beresp.backend.src_port
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/backend-connection/beresp-backend-src-port
---

**Type:** INTEGER  
**Access:** read-only

**Available in:** all subroutines

The Fastly source port used to connect to the backend server in a backend request.

This could be useful in reconciling origin logs that record requests by 5-tuple.