Port 8332 (Bitcoin JSON-RPC)

Bitcoin Core RPC interface (bitcoin-cli, wallets).

Registered (user) port, 1024-49151 TCP Peer-to-peer Localhost or LAN only

What port 8332 is used for

Bitcoin Core RPC interface (bitcoin-cli, wallets).

Localhost or LAN only. Controls the node and wallet; bind to localhost and use rpcauth.

Port 8332 is in the registered range and has no IANA assignment. The usage above is unofficial but widespread.

Linux: is anything listening on TCP 8332?

sudo ss -tlnp 'sport = :8332'

Linux / macOS: which process owns the port

sudo lsof -nP -i :8332

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':8332 '

Windows (Command Prompt)

netstat -ano | findstr :8332

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8332 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 8332

From Windows

Test-NetConnection HOST -Port 8332

ufw

sudo ufw deny 8332/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 8332 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 8332 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 8332' -Direction Inbound -Protocol TCP -LocalPort 8332 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.