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Port 5748 (tunalyzer)

IANA assigns port 5748 to tunalyzer: Wildbits Tunalyzer.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tunalyzer TCP Wildbits Tunalyzer Sylvain Demongeot -
tunalyzer UDP Wildbits Tunalyzer Sylvain Demongeot -

Registry dates for this port: registered 2005-08.

Check what is listening on port 5748

Linux: is anything listening on TCP 5748?
sudo ss -tlnp 'sport = :5748'
Linux: UDP 5748
sudo ss -ulnp 'sport = :5748'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5748
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5748 '
Windows (Command Prompt)
netstat -ano | findstr :5748
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5748 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5748
From Windows
Test-NetConnection HOST -Port 5748
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5748

Block port 5748 in the firewall

ufw
sudo ufw deny 5748/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5748 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5748 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5748' -Direction Inbound -Protocol TCP -LocalPort 5748 -Action Block
ufw
sudo ufw deny 5748/udp
iptables
sudo iptables -A INPUT -p udp --dport 5748 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5748 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5748' -Direction Inbound -Protocol UDP -LocalPort 5748 -Action Block

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