Port 7400 (rtps-discovery)

IANA assigns port 7400 to rtps-discovery: RTPS Discovery.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

rtps-discovery TCP RTPS Discovery Gerardo Pardo Castel -

rtps-discovery UDP RTPS Discovery Gerardo Pardo Castel -

Registry dates for this port: registered 2005-10.

Linux: is anything listening on TCP 7400?

sudo ss -tlnp 'sport = :7400'

Linux: UDP 7400

sudo ss -ulnp 'sport = :7400'

Linux / macOS: which process owns the port

sudo lsof -nP -i :7400

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':7400 '

Windows (Command Prompt)

netstat -ano | findstr :7400

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7400 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 7400

From Windows

Test-NetConnection HOST -Port 7400

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 7400

ufw

sudo ufw deny 7400/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 7400 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 7400 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 7400' -Direction Inbound -Protocol TCP -LocalPort 7400 -Action Block

ufw

sudo ufw deny 7400/udp

iptables

sudo iptables -A INPUT -p udp --dport 7400 -j DROP

nftables

sudo nft add rule inet filter input udp dport 7400 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 7400' -Direction Inbound -Protocol UDP -LocalPort 7400 -Action Block

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