What is port 5432 used for?

Port 5432 is the standard TCP port used for PostgreSQL Database. It is commonly used by PostgreSQL, pgAdmin, TimescaleDB, Supabase self-hosted. Default listener port for the PostgreSQL powerful, open-source object-relational database system.

How do I check if port 5432 is open?

Enter your public IP or hostname into the scanner tool and click Check. A sub-second raw TCP socket handshake will be initiated from our edge server to port 5432 on your target. If the 3-way handshake finishes with SYN-ACK, the port is OPEN. If an RST packet is returned, the host is reachable but the port is CLOSED. If packets time out without response, the port is FILTERED by an ISP or firewall.

Is port 5432 safe to expose to the public internet?

Exposing port 5432 carries elevated security risks (High risk). Enforce SSL/TLS connections and require scram-sha-256 password hashing. Prefer accessing over WireGuard VPN or SSH tunnel. For remote services, consider placing them behind a secure VPN (such as WireGuard or Tailscale) or restricting inbound access with strict IP firewall rules.

Why does port 5432 show as closed or filtered?

If port 5432 reports CLOSED or FILTERED, confirm that: 1) Your service is actively running and bound to 0.0.0.0 (not just localhost/127.0.0.1); 2) Your router has a port forwarding rule directing external port 5432 to your machine's local IP; 3) Your operating system firewall (Windows Defender Firewall, ufw, or iptables) allows incoming connections on port 5432.

PORT 5432 TCP Database High Risk

Port 5432 (PostgreSQL Database) Open Check

Default listener port for the PostgreSQL powerful, open-source object-relational database system.

Live Socket Reachability Probe

Pre-configured for Port 5432

Port Scanner

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Port Specifications & Network Behavior

Standard Port Number 5432

Primary Service PostgreSQL Database

Transport Protocol TCP

Traffic Classification Database

Residential ISP Status Typically unrestricted by consumer ISPs

Security Exposure High Exposure discouraged without VPN or firewall protection

Security Advisory: PostgreSQL Database (Port 5432)

Enforce SSL/TLS connections and require scram-sha-256 password hashing. Prefer accessing over WireGuard VPN or SSH tunnel.

Recommendation: Keep port 5432 closed to WAN traffic. Connect remotely using WireGuard, Tailscale, or an SSH tunnel.

Port Forwarding & Troubleshooting Checklist

If port 5432 returns CLOSED or FILTERED, work through this verified diagnostic checklist:

1 In postgresql.conf, set 'listen_addresses = '*'' instead of 'localhost'.
2 In pg_hba.conf, add client authentication entry allowing remote connection subnet.
3 Restart PostgreSQL service and check host firewall for port 5432.

Verify Host Is Listening Locally

Windows (PowerShell) netstat -ano | findstr :5432

Linux / macOS (Bash) ss -tulpn | grep :5432