signet

 -port=<port>
      Listen for connections on <port>. Nodes not using the default ports
      (default: 8333, testnet: 18333, signet: 38333, regtest: 18444)
      are unlikely to get incoming connections. Not relevant for I2P
      (see doc/i2p.md).

testnet

bitcoind, .bitcoin/, bitcoin.conf, Dockerfile, Bitcoind ports( 8332 18332 18443 8333 18333 18444 ), -chain, -datadir, -server, --help, Bitcoind logs, Bitcoind changelog