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// Other services

Port 3664: UPS Engine Port

Port 3664 is assigned by IANA to ups-engine (UPS Engine Port).

3664

How ups-engine works

Other services
client:3664ups-engineresponse client:3664ups-engineresponse

The client sends a request to port 3664 and the ups-engine 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 3664 dangerous?

We have no specific security note for port 3664. 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 3664

ServicePortTransportDescriptionReferenceUpdated
ups-engine 3664 TCP, UDP UPS Engine Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3664, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3664'      # process listening on 3664
sudo lsof -nP -i :3664

macOS

sudo lsof -nP -i :3664

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3664 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3664
netstat -ano | findstr :3664

From another machine

nmap -p 3664 -sV <host>
sudo nmap -sU -p 3664 <host>
nc -zv <host> 3664

Block it in the firewall

sudo ufw deny 3664/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3664" -Direction Inbound -LocalPort 3664 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3664 used for?

Port 3664 is assigned by IANA to ups-engine (UPS Engine Port).

Is port 3664 TCP or UDP?

Port 3664 is registered for TCP and UDP.

Is it safe to open port 3664?

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 3664 is open?

On Linux run "ss -ltnup 'sport = :3664'", on macOS "lsof -nP -i :3664", and on Windows "netstat -ano | findstr :3664" to see the local process. From another machine, "nmap -p 3664 <host>" shows whether it is reachable.

05 Related
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