Port 6432 (PgBouncer)

Default port of the PgBouncer PostgreSQL connection pooler.

Registered (user) port, 1024-49151 TCP Databases Do not expose to the internet

What port 6432 is used for

Default port of the PgBouncer PostgreSQL connection pooler.

Do not expose to the internet. Same as PostgreSQL: internal only, scram-sha-256 auth.

Service nameProtoDescriptionAssigneeReference

pgbouncer TCP PgBouncer Marko Kreen -

Registry dates for this port: registered 2009-02-13.

Linux: is anything listening on TCP 6432?

sudo ss -tlnp 'sport = :6432'

Linux / macOS: which process owns the port

sudo lsof -nP -i :6432

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':6432 '

Windows (Command Prompt)

netstat -ano | findstr :6432

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6432 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 6432

From Windows

Test-NetConnection HOST -Port 6432

ufw

sudo ufw deny 6432/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 6432 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 6432 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 6432' -Direction Inbound -Protocol TCP -LocalPort 6432 -Action Block

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