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Port 701 (lmp)

IANA assigns port 701 to lmp: Link Management Protocol (LMP).

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
lmp TCP Link Management Protocol (LMP) - RFC 4204
lmp UDP Link Management Protocol (LMP) - RFC 4204

Check what is listening on port 701

Linux: is anything listening on TCP 701?
sudo ss -tlnp 'sport = :701'
Linux: UDP 701
sudo ss -ulnp 'sport = :701'
Linux / macOS: which process owns the port
sudo lsof -nP -i :701
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':701 '
Windows (Command Prompt)
netstat -ano | findstr :701
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 701 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 701
From Windows
Test-NetConnection HOST -Port 701
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 701

Block port 701 in the firewall

ufw
sudo ufw deny 701/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 701 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 701 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 701' -Direction Inbound -Protocol TCP -LocalPort 701 -Action Block
ufw
sudo ufw deny 701/udp
iptables
sudo iptables -A INPUT -p udp --dport 701 -j DROP
nftables
sudo nft add rule inet filter input udp dport 701 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 701' -Direction Inbound -Protocol UDP -LocalPort 701 -Action Block

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