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Port 19539 (fxuptp)

IANA assigns port 19539 to fxuptp: FXUPTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fxuptp TCP FXUPTP Keiji Okuma -
fxuptp UDP FXUPTP Keiji Okuma -

Registry dates for this port: registered 2005-08.

Check what is listening on port 19539

Linux: is anything listening on TCP 19539?
sudo ss -tlnp 'sport = :19539'
Linux: UDP 19539
sudo ss -ulnp 'sport = :19539'
Linux / macOS: which process owns the port
sudo lsof -nP -i :19539
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':19539 '
Windows (Command Prompt)
netstat -ano | findstr :19539
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 19539 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 19539
From Windows
Test-NetConnection HOST -Port 19539
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 19539

Block port 19539 in the firewall

ufw
sudo ufw deny 19539/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 19539 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 19539 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 19539' -Direction Inbound -Protocol TCP -LocalPort 19539 -Action Block
ufw
sudo ufw deny 19539/udp
iptables
sudo iptables -A INPUT -p udp --dport 19539 -j DROP
nftables
sudo nft add rule inet filter input udp dport 19539 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 19539' -Direction Inbound -Protocol UDP -LocalPort 19539 -Action Block

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19411hp-sca19412hp-sessmon19540sxuptp19541jcp

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