---
title: "Firewall Access for Prefix"
slug: "firewall-access-for-prefix"
description: "Whitelist Cryptlex IP addresses & URLs for Prefix licensing. Whitelist IPs: 52.223.22.71, 35.71.188.31, and URL: https://api.cryptlex.com:443."
updated: 2022-05-12T14:21:35Z
published: 2022-05-12T14:21:35Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stackify.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Firewall Access for Prefix

Prefix uses Cryptlex for licensing. Some networks may require that you Whitelist Cryptlex IP addresses to enable LexActivator license and trial activations through the firewall.

## Access through firewall

If your policy denies access from external IP addresses and websites, you will need to whitelist the IP addresses below. A whitelist provides access to designated IP addresses and sites that would otherwise be prevented by your security policy.

`52.223.22.71`

`35.71.188.31`

**Alternatively, you can also whitelist Cryptlex Web API URL:**

https://api.cryptlex.com:443

**Additional domains you may need to whitelist:**

https://prefix.azureedge.net/