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// Network services

Port 3446: 3Com FAX RPC port

Port 3446 is assigned by IANA to 3comfaxrpc (3Com FAX RPC port).

3446

How 3comfaxrpc works

Network services
client:34463comfaxrpcresponse client:34463comfaxrpcresponse

The client sends a request to port 3446 and the 3comfaxrpc 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
Network services
01 Security

Is port 3446 dangerous?

We have no specific security note for port 3446. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 3446

ServicePortTransportDescriptionReferenceUpdated
3comfaxrpc 3446 TCP, UDP 3Com FAX RPC port - 2002-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 3446, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3446'      # process listening on 3446
sudo lsof -nP -i :3446

macOS

sudo lsof -nP -i :3446

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3446 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3446
netstat -ano | findstr :3446

From another machine

nmap -p 3446 -sV <host>
sudo nmap -sU -p 3446 <host>
nc -zv <host> 3446

Block it in the firewall

sudo ufw deny 3446/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3446" -Direction Inbound -LocalPort 3446 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3446 used for?

Port 3446 is assigned by IANA to 3comfaxrpc (3Com FAX RPC port).

Is port 3446 TCP or UDP?

Port 3446 is registered for TCP and UDP.

Is it safe to open port 3446?

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. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 3446 is open?

On Linux run "ss -ltnup 'sport = :3446'", on macOS "lsof -nP -i :3446", and on Windows "netstat -ano | findstr :3446" to see the local process. From another machine, "nmap -p 3446 <host>" shows whether it is reachable.

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