---
title: Addr
summary: null
url: https://www.fastly.com/documentation/reference/vcl/functions/addr
---

The addr module provides functionality for manipulating IP addresses. 

- [addr.extract_bits](https://www.fastly.com/documentation/reference/vcl/functions/addr/addr-extract-bits/)
- [addr.is_ipv4](https://www.fastly.com/documentation/reference/vcl/functions/addr/addr-is-ipv4/)
- [addr.is_ipv6](https://www.fastly.com/documentation/reference/vcl/functions/addr/addr-is-ipv6/)