networking//Port

- Ports are like apartment numbers on an IP address — each service gets its own.

Ports are like apartment numbers on an IP address — each service gets its own.

Below 1024: "well-known" / privileged (HTTP=80, HTTPS=443, SSH=22) — often require admin rights.

1024–49151: registered ports (8545=Besu RPC, 30303=Besu P2P, 3000=dev servers)

Besu uses two main ports: p2pPort (30303) for horizontal node↔node, rpcPort (8545) for vertical app→node.