CyberHunter
Local dataset, no network
// Gaming

Port 5154: BZFlag game server

Port 5154 is assigned by IANA to bzflag (BZFlag game server).

5154

How bzflag works

Gaming
playergame serverposition, input, state × 60 / s playerserver60 updates / s

The game client and server exchange small updates many times per second over port 5154.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Gaming
01 Security

Is port 5154 dangerous?

We have no specific security note for port 5154. Its risk depends on the program actually listening on it. General advice for gaming services:

  • Keep game servers and their plugins updated.
  • Rate-limit queries to limit DDoS amplification.
  • Run game servers under an unprivileged account.
02 Registry

IANA registry entries for port 5154

ServicePortTransportDescriptionReferenceUpdated
bzflag 5154 TCP, UDP BZFlag game server - 2003-07

// source: IANA service name and port number registry

03 Check it

Which program uses port 5154, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5154'      # process listening on 5154
sudo lsof -nP -i :5154

macOS

sudo lsof -nP -i :5154

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5154 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5154
netstat -ano | findstr :5154

From another machine

nmap -p 5154 -sV <host>
sudo nmap -sU -p 5154 <host>
nc -zv <host> 5154

Block it in the firewall

sudo ufw deny 5154/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5154" -Direction Inbound -LocalPort 5154 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5154 used for?

Port 5154 is assigned by IANA to bzflag (BZFlag game server).

Is port 5154 TCP or UDP?

Port 5154 is registered for TCP and UDP.

Is it safe to open port 5154?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Keep game servers and their plugins updated.

How do I check if port 5154 is open?

On Linux run "ss -ltnup 'sport = :5154'", on macOS "lsof -nP -i :5154", and on Windows "netstat -ano | findstr :5154" to see the local process. From another machine, "nmap -p 5154 <host>" shows whether it is reachable.

05 Related
:25565 Minecraft tcp · moderate risk :27015 Steam / Source engine udp · tcp · moderate risk :666 doom Id Software tcp · udp :1926 Evolution Game Server tcp · udp :2346 Game Connection Port tcp · udp :2347 Game Announcement and Location tcp · udp :2348 Information to query for game status tcp · udp :2914 Game Lobby tcp · udp

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