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Port 320 (ptp-general)

IANA assigns port 320 to ptp-general: PTP General.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ptp-general TCP PTP General Kang Lee -
ptp-general UDP PTP General Kang Lee -

Registry dates for this port: registered 2010-07-27.

Check what is listening on port 320

Linux: is anything listening on TCP 320?
sudo ss -tlnp 'sport = :320'
Linux: UDP 320
sudo ss -ulnp 'sport = :320'
Linux / macOS: which process owns the port
sudo lsof -nP -i :320
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':320 '
Windows (Command Prompt)
netstat -ano | findstr :320
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 320 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 320
From Windows
Test-NetConnection HOST -Port 320
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 320

Block port 320 in the firewall

ufw
sudo ufw deny 320/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 320 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 320 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 320' -Direction Inbound -Protocol TCP -LocalPort 320 -Action Block
ufw
sudo ufw deny 320/udp
iptables
sudo iptables -A INPUT -p udp --dport 320 -j DROP
nftables
sudo nft add rule inet filter input udp dport 320 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 320' -Direction Inbound -Protocol UDP -LocalPort 320 -Action Block

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318pkix-timestamp319ptp-event321pip322rtsps

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.