# Accessing Sources behind firewall

If you are trying to access a Source or Destination system that is behind a firewall, please ensure that the following Osmos IP addresses are allowed to access the system. Osmos uses fixed IP addresses to access your sources and destinations.

For the US Region: IP Addresses

<mark style="color:red;">`35.222.106.198/32`</mark>

<mark style="color:red;">`35.232.180.174/32`</mark>

For the EU Region: IP Addresses

<mark style="color:red;">`34.159.240.249/32`</mark>

<mark style="color:red;">`35.246.239.45/32`</mark>