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Port 5203 (targus-getdata3)

IANA assigns port 5203 to targus-getdata3: TARGUS GetData 3.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
targus-getdata3 TCP TARGUS GetData 3 John Keaveney -
targus-getdata3 UDP TARGUS GetData 3 John Keaveney -

Check what is listening on port 5203

Linux: is anything listening on TCP 5203?
sudo ss -tlnp 'sport = :5203'
Linux: UDP 5203
sudo ss -ulnp 'sport = :5203'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5203
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5203 '
Windows (Command Prompt)
netstat -ano | findstr :5203
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5203 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5203
From Windows
Test-NetConnection HOST -Port 5203
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5203

Block port 5203 in the firewall

ufw
sudo ufw deny 5203/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5203 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5203 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5203' -Direction Inbound -Protocol TCP -LocalPort 5203 -Action Block
ufw
sudo ufw deny 5203/udp
iptables
sudo iptables -A INPUT -p udp --dport 5203 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5203 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5203' -Direction Inbound -Protocol UDP -LocalPort 5203 -Action Block

Related ports

5201targus-getdata15202targus-getdata25209nomad5215noteza

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