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// Other services

Port 493: Transport Independent Convergence for FNA

Port 493 is assigned by IANA to ticf-2 (Transport Independent Convergence for FNA).

493

How ticf-2 works

Other services
client:493ticf-2response client:493ticf-2response

The client sends a request to port 493 and the ticf-2 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 493 dangerous?

We have no specific security note for port 493. 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 493

ServicePortTransportDescriptionReferenceUpdated
ticf-2 493 TCP, UDP Transport Independent Convergence for FNA - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 493, and is it reachable?

Linux

sudo ss -ltnup 'sport = :493'      # process listening on 493
sudo lsof -nP -i :493

macOS

sudo lsof -nP -i :493

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 493 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 493
netstat -ano | findstr :493

From another machine

nmap -p 493 -sV <host>
sudo nmap -sU -p 493 <host>
nc -zv <host> 493

Block it in the firewall

sudo ufw deny 493/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 493" -Direction Inbound -LocalPort 493 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 493 used for?

Port 493 is assigned by IANA to ticf-2 (Transport Independent Convergence for FNA).

Is port 493 TCP or UDP?

Port 493 is registered for TCP and UDP.

Is it safe to open port 493?

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 493 is open?

On Linux run "ss -ltnup 'sport = :493'", on macOS "lsof -nP -i :493", and on Windows "netstat -ano | findstr :493" to see the local process. From another machine, "nmap -p 493 <host>" shows whether it is reachable.

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