CyberHunter
Local dataset, no network
// Other services

Port 476: tn-tl-fd1

Port 476 is assigned by IANA to tn-tl-fd1 (tn-tl-fd1).

476

How tn-tl-fd1 works

Other services
client:476tn-tl-fd1response client:476tn-tl-fd1response

The client sends a request to port 476 and the tn-tl-fd1 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 476 dangerous?

We have no specific security note for port 476. 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 476

ServicePortTransportDescriptionReferenceUpdated
tn-tl-fd1 476 TCP, UDP tn-tl-fd1 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 476, and is it reachable?

Linux

sudo ss -ltnup 'sport = :476'      # process listening on 476
sudo lsof -nP -i :476

macOS

sudo lsof -nP -i :476

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 476 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 476
netstat -ano | findstr :476

From another machine

nmap -p 476 -sV <host>
sudo nmap -sU -p 476 <host>
nc -zv <host> 476

Block it in the firewall

sudo ufw deny 476/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 476" -Direction Inbound -LocalPort 476 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 476 used for?

Port 476 is assigned by IANA to tn-tl-fd1 (tn-tl-fd1).

Is port 476 TCP or UDP?

Port 476 is registered for TCP and UDP.

Is it safe to open port 476?

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 476 is open?

On Linux run "ss -ltnup 'sport = :476'", on macOS "lsof -nP -i :476", and on Windows "netstat -ano | findstr :476" to see the local process. From another machine, "nmap -p 476 <host>" shows whether it is reachable.

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