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// Other services

Port 4480: Agent Transfer Protocol

Port 4480 is assigned by IANA to agtp (Agent Transfer Protocol), agtp-quic (Agent Transfer Protocol over QUIC).

4480

How agtp works

Other services
client:4480agtpresponse client:4480agtpresponse

The client sends a request to port 4480 and the agtp 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 4480 dangerous?

We have no specific security note for port 4480. 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 4480

ServicePortTransportDescriptionReferenceUpdated
agtp 4480 TCP Agent Transfer Protocol - 2026-04-30
agtp-quic 4480 UDP Agent Transfer Protocol over QUIC - 2026-04-30

// source: IANA service name and port number registry

03 Check it

Which program uses port 4480, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4480'      # process listening on 4480
sudo lsof -nP -i :4480

macOS

sudo lsof -nP -i :4480

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4480 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4480
netstat -ano | findstr :4480

From another machine

nmap -p 4480 -sV <host>
sudo nmap -sU -p 4480 <host>
nc -zv <host> 4480

Block it in the firewall

sudo ufw deny 4480/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4480" -Direction Inbound -LocalPort 4480 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4480 used for?

Port 4480 is assigned by IANA to agtp (Agent Transfer Protocol), agtp-quic (Agent Transfer Protocol over QUIC).

Is port 4480 TCP or UDP?

Port 4480 is registered for TCP and UDP.

Is it safe to open port 4480?

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 4480 is open?

On Linux run "ss -ltnup 'sport = :4480'", on macOS "lsof -nP -i :4480", and on Windows "netstat -ano | findstr :4480" to see the local process. From another machine, "nmap -p 4480 <host>" shows whether it is reachable.

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