- Use strong credentials and TLS for signalling.
- Rate-limit registrations to stop extension scanning and toll fraud.
- Alert on unexpected chat protocols leaving servers (possible command and control).
Port 3447: DirectNet IM System
Port 3447 is assigned by IANA to directnet (DirectNet IM System).
3447
How directnet works
Voice & chatPort 3447 sets up the call (who calls whom), then the voice travels as a stream of audio packets.
- 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
- Voice & chat
Is port 3447 dangerous?
We have no specific security note for port 3447. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 3447
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| directnet | 3447 | TCP, UDP | DirectNet IM System | - | 2002-04 |
// source: IANA service name and port number registry
Which program uses port 3447, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3447' # process listening on 3447
sudo lsof -nP -i :3447macOS
sudo lsof -nP -i :3447
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3447 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3447 netstat -ano | findstr :3447
From another machine
nmap -p 3447 -sV <host> sudo nmap -sU -p 3447 <host> nc -zv <host> 3447
Block it in the firewall
sudo ufw deny 3447/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3447" -Direction Inbound -LocalPort 3447 -Protocol TCP -Action Block # Windows
What is port 3447 used for?
Port 3447 is assigned by IANA to directnet (DirectNet IM System).
Is port 3447 TCP or UDP?
Port 3447 is registered for TCP and UDP.
Is it safe to open port 3447?
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. Use strong credentials and TLS for signalling.
How do I check if port 3447 is open?
On Linux run "ss -ltnup 'sport = :3447'", on macOS "lsof -nP -i :3447", and on Windows "netstat -ano | findstr :3447" to see the local process. From another machine, "nmap -p 3447 <host>" shows whether it is reachable.