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Port 5319 (roughtime)

IANA assigns port 5319 to roughtime: Roughtime time synchronization.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
roughtime TCP Roughtime time synchronization IESG RFC 10049
roughtime UDP Roughtime time synchronization IESG RFC 10049

Registry dates for this port: registered 2026-03-27.

Check what is listening on port 5319

Linux: is anything listening on TCP 5319?
sudo ss -tlnp 'sport = :5319'
Linux: UDP 5319
sudo ss -ulnp 'sport = :5319'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5319
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5319 '
Windows (Command Prompt)
netstat -ano | findstr :5319
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5319 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5319
From Windows
Test-NetConnection HOST -Port 5319
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5319

Block port 5319 in the firewall

ufw
sudo ufw deny 5319/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5319 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5319 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5319' -Direction Inbound -Protocol TCP -LocalPort 5319 -Action Block
ufw
sudo ufw deny 5319/udp
iptables
sudo iptables -A INPUT -p udp --dport 5319 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5319 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5319' -Direction Inbound -Protocol UDP -LocalPort 5319 -Action Block

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