dcrd/docs/default_ports.md

While dcrd is highly configurable when it comes to the network configuration, the following is intended to be a quick reference for the default ports used so port forwarding can be configured as required.

dcrd provides a --upnp flag which can be used to automatically map the Decred peer-to-peer listening port if your router supports UPnP. If your router does not support UPnP, or you don't wish to use it, please note that only the Decred peer-to-peer port should be forwarded unless you specifically want to allow RPC access to your dcrd from external sources such as in more advanced network configurations.

Name	Port
Default Decred peer-to-peer port	TCP 9108
Default RPC port	TCP 9109