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// Other services

Port 8205: LM Instmgr

Port 8205 is assigned by IANA to lm-instmgr (LM Instmgr).

8205

How lm-instmgr works

Other services
client:8205lm-instmgrresponse client:8205lm-instmgrresponse

The client sends a request to port 8205 and the lm-instmgr 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 8205 dangerous?

We have no specific security note for port 8205. 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 8205

ServicePortTransportDescriptionReferenceUpdated
lm-instmgr 8205 TCP, UDP LM Instmgr - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8205, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8205'      # process listening on 8205
sudo lsof -nP -i :8205

macOS

sudo lsof -nP -i :8205

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8205 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8205
netstat -ano | findstr :8205

From another machine

nmap -p 8205 -sV <host>
sudo nmap -sU -p 8205 <host>
nc -zv <host> 8205

Block it in the firewall

sudo ufw deny 8205/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8205" -Direction Inbound -LocalPort 8205 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8205 used for?

Port 8205 is assigned by IANA to lm-instmgr (LM Instmgr).

Is port 8205 TCP or UDP?

Port 8205 is registered for TCP and UDP.

Is it safe to open port 8205?

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 8205 is open?

On Linux run "ss -ltnup 'sport = :8205'", on macOS "lsof -nP -i :8205", and on Windows "netstat -ano | findstr :8205" to see the local process. From another machine, "nmap -p 8205 <host>" shows whether it is reachable.

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