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Port 1951 (bcs-lmserver)

IANA assigns port 1951 to bcs-lmserver.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bcs-lmserver TCP bcs-lmserver Andy Warner -
bcs-lmserver UDP bcs-lmserver Andy Warner -

Check what is listening on port 1951

Linux: is anything listening on TCP 1951?
sudo ss -tlnp 'sport = :1951'
Linux: UDP 1951
sudo ss -ulnp 'sport = :1951'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1951
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1951 '
Windows (Command Prompt)
netstat -ano | findstr :1951
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1951 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1951
From Windows
Test-NetConnection HOST -Port 1951
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1951

Block port 1951 in the firewall

ufw
sudo ufw deny 1951/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1951 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1951 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1951' -Direction Inbound -Protocol TCP -LocalPort 1951 -Action Block
ufw
sudo ufw deny 1951/udp
iptables
sudo iptables -A INPUT -p udp --dport 1951 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1951 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1951' -Direction Inbound -Protocol UDP -LocalPort 1951 -Action Block

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