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Port 4029 (ip-qsig)

IANA assigns port 4029 to ip-qsig: IP Q signaling protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ip-qsig TCP IP Q signaling protocol Toru Tachibana -
ip-qsig UDP IP Q signaling protocol Toru Tachibana -

Check what is listening on port 4029

Linux: is anything listening on TCP 4029?
sudo ss -tlnp 'sport = :4029'
Linux: UDP 4029
sudo ss -ulnp 'sport = :4029'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4029
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4029 '
Windows (Command Prompt)
netstat -ano | findstr :4029
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4029 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4029
From Windows
Test-NetConnection HOST -Port 4029
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4029

Block port 4029 in the firewall

ufw
sudo ufw deny 4029/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4029 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4029 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4029' -Direction Inbound -Protocol TCP -LocalPort 4029 -Action Block
ufw
sudo ufw deny 4029/udp
iptables
sudo iptables -A INPUT -p udp --dport 4029 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4029 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4029' -Direction Inbound -Protocol UDP -LocalPort 4029 -Action Block

Related ports

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