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Port 319 (ptp-event)

IANA assigns port 319 to ptp-event: PTP Event.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ptp-event TCP PTP Event Kang Lee -
ptp-event UDP PTP Event Kang Lee -

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

Check what is listening on port 319

Linux: is anything listening on TCP 319?
sudo ss -tlnp 'sport = :319'
Linux: UDP 319
sudo ss -ulnp 'sport = :319'
Linux / macOS: which process owns the port
sudo lsof -nP -i :319
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':319 '
Windows (Command Prompt)
netstat -ano | findstr :319
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 319 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 319
From Windows
Test-NetConnection HOST -Port 319
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 319

Block port 319 in the firewall

ufw
sudo ufw deny 319/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 319 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 319 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 319' -Direction Inbound -Protocol TCP -LocalPort 319 -Action Block
ufw
sudo ufw deny 319/udp
iptables
sudo iptables -A INPUT -p udp --dport 319 -j DROP
nftables
sudo nft add rule inet filter input udp dport 319 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 319' -Direction Inbound -Protocol UDP -LocalPort 319 -Action Block

Related ports

317zannet318pkix-timestamp320ptp-general321pip

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