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// Other services

Port 3880: IGRS

Port 3880 is assigned by IANA to igrs (IGRS).

3880

How igrs works

Other services
client:3880igrsresponse client:3880igrsresponse

The client sends a request to port 3880 and the igrs 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 3880 dangerous?

We have no specific security note for port 3880. 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 3880

ServicePortTransportDescriptionReferenceUpdated
igrs 3880 TCP, UDP IGRS - 2003-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3880, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3880'      # process listening on 3880
sudo lsof -nP -i :3880

macOS

sudo lsof -nP -i :3880

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3880 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3880
netstat -ano | findstr :3880

From another machine

nmap -p 3880 -sV <host>
sudo nmap -sU -p 3880 <host>
nc -zv <host> 3880

Block it in the firewall

sudo ufw deny 3880/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3880" -Direction Inbound -LocalPort 3880 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3880 used for?

Port 3880 is assigned by IANA to igrs (IGRS).

Is port 3880 TCP or UDP?

Port 3880 is registered for TCP and UDP.

Is it safe to open port 3880?

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 3880 is open?

On Linux run "ss -ltnup 'sport = :3880'", on macOS "lsof -nP -i :3880", and on Windows "netstat -ano | findstr :3880" to see the local process. From another machine, "nmap -p 3880 <host>" shows whether it is reachable.

05 Related
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