Port 38638 (psqlmws)

IANA assigns port 38638 to psqlmws: Premier SQL Middleware Server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

psqlmws TCP Premier SQL Middleware Server Brain Patchwork DX LLC -

Registry dates for this port: registered 2022-02-15.

Linux: is anything listening on TCP 38638?

sudo ss -tlnp 'sport = :38638'

Linux / macOS: which process owns the port

sudo lsof -nP -i :38638

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':38638 '

Windows (Command Prompt)

netstat -ano | findstr :38638

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 38638 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 38638

From Windows

Test-NetConnection HOST -Port 38638

ufw

sudo ufw deny 38638/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 38638 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 38638 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 38638' -Direction Inbound -Protocol TCP -LocalPort 38638 -Action Block

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