# Ports and protocols

> Required ports and protocols for using the Relay service.

The Multiplayer Services SDK requires the following ports and protocols for using Relay:

* For API calls, such as creating an allocation, listing available regions, or querying the QoS discovery service, connections operate over TCP using HTTP or HTTPS on ports 80 or 443.
* For standard connections to a Relay allocation, whether with or without DTLS enabled, the system uses a port range of 37000 to 37100. Most connections will use UDP, except in the case of WebSockets, which use TCP.
* The QoS service will always use UDP on port 7778.