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Port 8450 (npmp)

IANA assigns port 8450 to npmp.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
npmp TCP npmp Ian Chard -
npmp UDP npmp Ian Chard -

Check what is listening on port 8450

Linux: is anything listening on TCP 8450?
sudo ss -tlnp 'sport = :8450'
Linux: UDP 8450
sudo ss -ulnp 'sport = :8450'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8450
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8450 '
Windows (Command Prompt)
netstat -ano | findstr :8450
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8450 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8450
From Windows
Test-NetConnection HOST -Port 8450
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8450

Block port 8450 in the firewall

ufw
sudo ufw deny 8450/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8450 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8450 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8450' -Direction Inbound -Protocol TCP -LocalPort 8450 -Action Block
ufw
sudo ufw deny 8450/udp
iptables
sudo iptables -A INPUT -p udp --dport 8450 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8450 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8450' -Direction Inbound -Protocol UDP -LocalPort 8450 -Action Block

Related ports

8445copy, copy-disc8448matrix-fed8457nexentamv8470cisco-avp

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