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Port 3446 (3comfaxrpc)

IANA assigns port 3446 to 3comfaxrpc: 3Com FAX RPC port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
3comfaxrpc TCP 3Com FAX RPC port Christopher Wells 2 -
3comfaxrpc UDP 3Com FAX RPC port Christopher Wells 2 -

Registry dates for this port: registered 2002-04.

Check what is listening on port 3446

Linux: is anything listening on TCP 3446?
sudo ss -tlnp 'sport = :3446'
Linux: UDP 3446
sudo ss -ulnp 'sport = :3446'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3446
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3446 '
Windows (Command Prompt)
netstat -ano | findstr :3446
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3446 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3446
From Windows
Test-NetConnection HOST -Port 3446
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3446

Block port 3446 in the firewall

ufw
sudo ufw deny 3446/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3446 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3446 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3446' -Direction Inbound -Protocol TCP -LocalPort 3446 -Action Block
ufw
sudo ufw deny 3446/udp
iptables
sudo iptables -A INPUT -p udp --dport 3446 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3446 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3446' -Direction Inbound -Protocol UDP -LocalPort 3446 -Action Block

Related ports

3444denali-server3445monp3447directnet3448dnc-port

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.