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Port 434 (mobileip-agent)

IANA assigns port 434 to mobileip-agent: MobileIP-Agent.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mobileip-agent TCP MobileIP-Agent - -
mobileip-agent UDP MobileIP-Agent - -

Check what is listening on port 434

Linux: is anything listening on TCP 434?
sudo ss -tlnp 'sport = :434'
Linux: UDP 434
sudo ss -ulnp 'sport = :434'
Linux / macOS: which process owns the port
sudo lsof -nP -i :434
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':434 '
Windows (Command Prompt)
netstat -ano | findstr :434
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 434 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 434
From Windows
Test-NetConnection HOST -Port 434
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 434

Block port 434 in the firewall

ufw
sudo ufw deny 434/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 434 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 434 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 434' -Direction Inbound -Protocol TCP -LocalPort 434 -Action Block
ufw
sudo ufw deny 434/udp
iptables
sudo iptables -A INPUT -p udp --dport 434 -j DROP
nftables
sudo nft add rule inet filter input udp dport 434 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 434' -Direction Inbound -Protocol UDP -LocalPort 434 -Action Block

Related ports

432iasd433nnsp435mobilip-mn436dna-cml

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