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// Other services

Port 3720: UF Astro. Instr. Services

Port 3720 is assigned by IANA to ufastro-instr (UF Astro. Instr. Services).

3720

How ufastro-instr works

Other services
client:3720ufastro-instrresponse client:3720ufastro-instrresponse

The client sends a request to port 3720 and the ufastro-instr 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 3720 dangerous?

We have no specific security note for port 3720. 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 3720

ServicePortTransportDescriptionReferenceUpdated
ufastro-instr 3720 TCP, UDP UF Astro. Instr. Services - 2003-03

// source: IANA service name and port number registry

03 Check it

Which program uses port 3720, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3720'      # process listening on 3720
sudo lsof -nP -i :3720

macOS

sudo lsof -nP -i :3720

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3720 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3720
netstat -ano | findstr :3720

From another machine

nmap -p 3720 -sV <host>
sudo nmap -sU -p 3720 <host>
nc -zv <host> 3720

Block it in the firewall

sudo ufw deny 3720/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3720" -Direction Inbound -LocalPort 3720 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3720 used for?

Port 3720 is assigned by IANA to ufastro-instr (UF Astro. Instr. Services).

Is port 3720 TCP or UDP?

Port 3720 is registered for TCP and UDP.

Is it safe to open port 3720?

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 3720 is open?

On Linux run "ss -ltnup 'sport = :3720'", on macOS "lsof -nP -i :3720", and on Windows "netstat -ano | findstr :3720" to see the local process. From another machine, "nmap -p 3720 <host>" shows whether it is reachable.

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