Port 5432 (TCP) — PostgreSQL Database
TCP/5432 is the default listener for PostgreSQL relational databases, TimescaleDB, PostGIS, Supabase backends, and PgBouncer/Pgpool-II architectures.
| Port Number | 5432 |
|---|---|
| Transport Protocol | TCP |
| Primary Service | PostgreSQL Database |
| Standard / Specification | PostgreSQL v3 Protocol |
| IANA Port Range | Registered User Port (1024–49151) |
| Internet Exposure Risk | High-value data store; restrict strictly to internal application tiers and connection poolers. |
Firewall Architecture & Hardening Best Practices
Isolate TCP/5432 inside private database subnets with no public IP, enforce scram-sha-256 authentication plus hostssl rules in pg_hba.conf, and connect devs via SSH or VPN.
Operational Troubleshooting Note
Use pg_isready -h db.internal -p 5432 from application pods to verify L4/L7 health cleanly during deployment checks.
Quick CLI Connectivity & Firewall Reference
# Test TCP/5432 reachability (Linux / macOS / PowerShell) nc -zv target.example.com 5432 Test-NetConnection -ComputerName target.example.com -Port 5432 # Allow restricted CIDR on Linux UFW firewall ufw allow from 10.0.0.0/8 to any port 5432 proto tcp
Planning firewall allowlists or VPN overlays? Use our IPv4 CIDR Calculator, MTU & TCP MSS Calculator, or WireGuard AllowedIPs Generator.
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