HTTPfy

Port 5154 (bzflag)

IANA assigns port 5154 to bzflag: BZFlag game server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bzflag TCP BZFlag game server Tim Riker -
bzflag UDP BZFlag game server Tim Riker -

Registry dates for this port: registered 2003-07.

Check what is listening on port 5154

Linux: is anything listening on TCP 5154?
sudo ss -tlnp 'sport = :5154'
Linux: UDP 5154
sudo ss -ulnp 'sport = :5154'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5154
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5154 '
Windows (Command Prompt)
netstat -ano | findstr :5154
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5154 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5154
From Windows
Test-NetConnection HOST -Port 5154
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5154

Block port 5154 in the firewall

ufw
sudo ufw deny 5154/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5154 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5154 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5154' -Direction Inbound -Protocol TCP -LocalPort 5154 -Action Block
ufw
sudo ufw deny 5154/udp
iptables
sudo iptables -A INPUT -p udp --dport 5154 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5154 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5154' -Direction Inbound -Protocol UDP -LocalPort 5154 -Action Block

Related ports

5151esri-sde, esri_sde5152sde-discovery5155asctrl-agent5156rugameonline

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