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// Other services

Port 366: ODMR

Port 366 is assigned by IANA to odmr (ODMR).

366

How odmr works

Other services
client:366odmrresponse client:366odmrresponse

The client sends a request to port 366 and the odmr 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 366 dangerous?

We have no specific security note for port 366. 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 366

ServicePortTransportDescriptionReferenceUpdated
odmr 366 TCP, UDP ODMR - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 366, and is it reachable?

Linux

sudo ss -ltnup 'sport = :366'      # process listening on 366
sudo lsof -nP -i :366

macOS

sudo lsof -nP -i :366

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 366 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 366
netstat -ano | findstr :366

From another machine

nmap -p 366 -sV <host>
sudo nmap -sU -p 366 <host>
nc -zv <host> 366

Block it in the firewall

sudo ufw deny 366/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 366" -Direction Inbound -LocalPort 366 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 366 used for?

Port 366 is assigned by IANA to odmr (ODMR).

Is port 366 TCP or UDP?

Port 366 is registered for TCP and UDP.

Is it safe to open port 366?

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 366 is open?

On Linux run "ss -ltnup 'sport = :366'", on macOS "lsof -nP -i :366", and on Windows "netstat -ano | findstr :366" to see the local process. From another machine, "nmap -p 366 <host>" shows whether it is reachable.

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