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// Other services

Port 549: IDFP

Port 549 is assigned by IANA to idfp (IDFP).

549

How idfp works

Other services
client:549idfpresponse client:549idfpresponse

The client sends a request to port 549 and the idfp 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 549 dangerous?

We have no specific security note for port 549. 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 549

ServicePortTransportDescriptionReferenceUpdated
idfp 549 TCP, UDP IDFP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 549, and is it reachable?

Linux

sudo ss -ltnup 'sport = :549'      # process listening on 549
sudo lsof -nP -i :549

macOS

sudo lsof -nP -i :549

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 549 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 549
netstat -ano | findstr :549

From another machine

nmap -p 549 -sV <host>
sudo nmap -sU -p 549 <host>
nc -zv <host> 549

Block it in the firewall

sudo ufw deny 549/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 549" -Direction Inbound -LocalPort 549 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 549 used for?

Port 549 is assigned by IANA to idfp (IDFP).

Is port 549 TCP or UDP?

Port 549 is registered for TCP and UDP.

Is it safe to open port 549?

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 549 is open?

On Linux run "ss -ltnup 'sport = :549'", on macOS "lsof -nP -i :549", and on Windows "netstat -ano | findstr :549" to see the local process. From another machine, "nmap -p 549 <host>" shows whether it is reachable.

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