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Port 19540 (sxuptp)

IANA assigns port 19540 to sxuptp: SXUPTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sxuptp TCP SXUPTP Keiji Okuma -
sxuptp UDP SXUPTP Keiji Okuma -

Registry dates for this port: registered 2002-08.

Check what is listening on port 19540

Linux: is anything listening on TCP 19540?
sudo ss -tlnp 'sport = :19540'
Linux: UDP 19540
sudo ss -ulnp 'sport = :19540'
Linux / macOS: which process owns the port
sudo lsof -nP -i :19540
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':19540 '
Windows (Command Prompt)
netstat -ano | findstr :19540
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 19540 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 19540
From Windows
Test-NetConnection HOST -Port 19540
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 19540

Block port 19540 in the firewall

ufw
sudo ufw deny 19540/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 19540 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 19540 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 19540' -Direction Inbound -Protocol TCP -LocalPort 19540 -Action Block
ufw
sudo ufw deny 19540/udp
iptables
sudo iptables -A INPUT -p udp --dport 19540 -j DROP
nftables
sudo nft add rule inet filter input udp dport 19540 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 19540' -Direction Inbound -Protocol UDP -LocalPort 19540 -Action Block

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