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Port 4446 (n1-fwp)

IANA assigns port 4446 to n1-fwp: N1-FWP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
n1-fwp TCP N1-FWP - -
n1-fwp UDP N1-FWP - -

Check what is listening on port 4446

Linux: is anything listening on TCP 4446?
sudo ss -tlnp 'sport = :4446'
Linux: UDP 4446
sudo ss -ulnp 'sport = :4446'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4446
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4446 '
Windows (Command Prompt)
netstat -ano | findstr :4446
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4446 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4446
From Windows
Test-NetConnection HOST -Port 4446
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4446

Block port 4446 in the firewall

ufw
sudo ufw deny 4446/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4446 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4446 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4446' -Direction Inbound -Protocol TCP -LocalPort 4446 -Action Block
ufw
sudo ufw deny 4446/udp
iptables
sudo iptables -A INPUT -p udp --dport 4446 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4446 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4446' -Direction Inbound -Protocol UDP -LocalPort 4446 -Action Block

Related ports

4444Metasploit default / krb5244445upnotifyp4447n1-rmgmt4448asc-slmd

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