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Local dataset, no network
// Other services

Port 1550: Image Storage license manager 3M Company

Port 1550 is assigned by IANA to 3m-image-lm (Image Storage license manager 3M Company).

1550

How 3m-image-lm works

Other services
client:15503m-image-lmresponse client:15503m-image-lmresponse

The client sends a request to port 1550 and the 3m-image-lm 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 1550 dangerous?

We have no specific security note for port 1550. 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 1550

ServicePortTransportDescriptionReferenceUpdated
3m-image-lm 1550 TCP, UDP Image Storage license manager 3M Company - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1550, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1550'      # process listening on 1550
sudo lsof -nP -i :1550

macOS

sudo lsof -nP -i :1550

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1550 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1550
netstat -ano | findstr :1550

From another machine

nmap -p 1550 -sV <host>
sudo nmap -sU -p 1550 <host>
nc -zv <host> 1550

Block it in the firewall

sudo ufw deny 1550/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1550" -Direction Inbound -LocalPort 1550 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1550 used for?

Port 1550 is assigned by IANA to 3m-image-lm (Image Storage license manager 3M Company).

Is port 1550 TCP or UDP?

Port 1550 is registered for TCP and UDP.

Is it safe to open port 1550?

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 1550 is open?

On Linux run "ss -ltnup 'sport = :1550'", on macOS "lsof -nP -i :1550", and on Windows "netstat -ano | findstr :1550" to see the local process. From another machine, "nmap -p 1550 <host>" shows whether it is reachable.

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