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// Other services

Port 3420: iFCP User Port

Port 3420 is assigned by IANA to ifcp-port (iFCP User Port).

3420

How ifcp-port works

Other services
client:3420ifcp-portresponse client:3420ifcp-portresponse

The client sends a request to port 3420 and the ifcp-port 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 3420 dangerous?

We have no specific security note for port 3420. 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 3420

ServicePortTransportDescriptionReferenceUpdated
ifcp-port 3420 TCP, UDP iFCP User Port RFC 4172 -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3420, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3420'      # process listening on 3420
sudo lsof -nP -i :3420

macOS

sudo lsof -nP -i :3420

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3420 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3420
netstat -ano | findstr :3420

From another machine

nmap -p 3420 -sV <host>
sudo nmap -sU -p 3420 <host>
nc -zv <host> 3420

Block it in the firewall

sudo ufw deny 3420/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3420" -Direction Inbound -LocalPort 3420 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3420 used for?

Port 3420 is assigned by IANA to ifcp-port (iFCP User Port).

Is port 3420 TCP or UDP?

Port 3420 is registered for TCP and UDP.

Is it safe to open port 3420?

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 3420 is open?

On Linux run "ss -ltnup 'sport = :3420'", on macOS "lsof -nP -i :3420", and on Windows "netstat -ano | findstr :3420" to see the local process. From another machine, "nmap -p 3420 <host>" shows whether it is reachable.

05 Related
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