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// Other services

Port 3487: LISA TCP Transfer Channel

Port 3487 is assigned by IANA to ltctcp (LISA TCP Transfer Channel), ltcudp (LISA UDP Transfer Channel).

3487

How ltctcp works

Other services
client:3487ltctcpresponse client:3487ltctcpresponse

The client sends a request to port 3487 and the ltctcp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3487 dangerous?

We have no specific security note for port 3487. 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 3487

ServicePortTransportDescriptionReferenceUpdated
ltctcp 3487 TCP LISA TCP Transfer Channel - -
ltcudp 3487 UDP LISA UDP Transfer Channel - 2002-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 3487, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3487'      # process listening on 3487
sudo lsof -nP -i :3487

macOS

sudo lsof -nP -i :3487

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3487 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3487
netstat -ano | findstr :3487

From another machine

nmap -p 3487 -sV <host>
sudo nmap -sU -p 3487 <host>
nc -zv <host> 3487

Block it in the firewall

sudo ufw deny 3487/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3487" -Direction Inbound -LocalPort 3487 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3487 used for?

Port 3487 is assigned by IANA to ltctcp (LISA TCP Transfer Channel), ltcudp (LISA UDP Transfer Channel).

Is port 3487 TCP or UDP?

Port 3487 is registered for TCP and UDP.

Is it safe to open port 3487?

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 3487 is open?

On Linux run "ss -ltnup 'sport = :3487'", on macOS "lsof -nP -i :3487", and on Windows "netstat -ano | findstr :3487" to see the local process. From another machine, "nmap -p 3487 <host>" shows whether it is reachable.

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