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// Other services

Port 9255: Manager On Network

Port 9255 is assigned by IANA to mon (Manager On Network).

9255

How mon works

Other services
client:9255monresponse client:9255monresponse

The client sends a request to port 9255 and the mon 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 9255 dangerous?

We have no specific security note for port 9255. 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 9255

ServicePortTransportDescriptionReferenceUpdated
mon 9255 TCP, UDP Manager On Network - 2007-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 9255, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9255'      # process listening on 9255
sudo lsof -nP -i :9255

macOS

sudo lsof -nP -i :9255

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9255 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9255
netstat -ano | findstr :9255

From another machine

nmap -p 9255 -sV <host>
sudo nmap -sU -p 9255 <host>
nc -zv <host> 9255

Block it in the firewall

sudo ufw deny 9255/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9255" -Direction Inbound -LocalPort 9255 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9255 used for?

Port 9255 is assigned by IANA to mon (Manager On Network).

Is port 9255 TCP or UDP?

Port 9255 is registered for TCP and UDP.

Is it safe to open port 9255?

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 9255 is open?

On Linux run "ss -ltnup 'sport = :9255'", on macOS "lsof -nP -i :9255", and on Windows "netstat -ano | findstr :9255" to see the local process. From another machine, "nmap -p 9255 <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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