CyberHunter
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// Other services

Port 2155: Bridge Protocol

Port 2155 is assigned by IANA to brdptc (Bridge Protocol).

2155

How brdptc works

Other services
client:2155brdptcresponse client:2155brdptcresponse

The client sends a request to port 2155 and the brdptc service answers.

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
Other services
01 Security

Is port 2155 dangerous?

We have no specific security note for port 2155. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 2155

ServicePortTransportDescriptionReferenceUpdated
brdptc 2155 TCP, UDP Bridge Protocol - 2007-09-27

// source: IANA service name and port number registry

03 Check it

Which program uses port 2155, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2155'      # process listening on 2155
sudo lsof -nP -i :2155

macOS

sudo lsof -nP -i :2155

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2155 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2155
netstat -ano | findstr :2155

From another machine

nmap -p 2155 -sV <host>
sudo nmap -sU -p 2155 <host>
nc -zv <host> 2155

Block it in the firewall

sudo ufw deny 2155/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2155" -Direction Inbound -LocalPort 2155 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2155 used for?

Port 2155 is assigned by IANA to brdptc (Bridge Protocol).

Is port 2155 TCP or UDP?

Port 2155 is registered for TCP and UDP.

Is it safe to open port 2155?

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. Close the port if nothing on the host needs it.

How do I check if port 2155 is open?

On Linux run "ss -ltnup 'sport = :2155'", on macOS "lsof -nP -i :2155", and on Windows "netstat -ano | findstr :2155" to see the local process. From another machine, "nmap -p 2155 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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