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// Other services

Port 4726: A26 (FAP-FGW)

Port 4726 is assigned by IANA to a26-fap-fgw (A26 (FAP-FGW)).

4726

How a26-fap-fgw works

Other services
client:4726a26-fap-fgwresponse client:4726a26-fap-fgwresponse

The client sends a request to port 4726 and the a26-fap-fgw service answers.

Transport
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 4726 dangerous?

We have no specific security note for port 4726. 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 4726

ServicePortTransportDescriptionReferenceUpdated
a26-fap-fgw 4726 UDP A26 (FAP-FGW) - 2010-10-15
-4726-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4726, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4726'      # process listening on 4726
sudo lsof -nP -i :4726

macOS

sudo lsof -nP -i :4726

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4726 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4726
netstat -ano | findstr :4726

From another machine

nmap -p 4726 -sV <host>
sudo nmap -sU -p 4726 <host>
nc -zv <host> 4726

Block it in the firewall

sudo ufw deny 4726/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4726" -Direction Inbound -LocalPort 4726 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4726 used for?

Port 4726 is assigned by IANA to a26-fap-fgw (A26 (FAP-FGW)).

Is port 4726 TCP or UDP?

Port 4726 is registered for UDP.

Is it safe to open port 4726?

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 4726 is open?

On Linux run "ss -ltnup 'sport = :4726'", on macOS "lsof -nP -i :4726", and on Windows "netstat -ano | findstr :4726" to see the local process. From another machine, "nmap -p 4726 <host>" shows whether it is reachable.

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