> For the complete documentation index, see [llms.txt](https://docs.osmos.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.osmos.io/source-connectors/accessing-sources-behind-firewall.md).

# 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>


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