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Port 409 (prm-nm)

IANA assigns port 409 to prm-nm: Prospero Resource Manager Node Man..

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
prm-nm TCP Prospero Resource Manager Node Man. B Clifford Neuman -
prm-nm UDP Prospero Resource Manager Node Man. B Clifford Neuman -

Check what is listening on port 409

Linux: is anything listening on TCP 409?
sudo ss -tlnp 'sport = :409'
Linux: UDP 409
sudo ss -ulnp 'sport = :409'
Linux / macOS: which process owns the port
sudo lsof -nP -i :409
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':409 '
Windows (Command Prompt)
netstat -ano | findstr :409
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 409 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 409
From Windows
Test-NetConnection HOST -Port 409
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 409

Block port 409 in the firewall

ufw
sudo ufw deny 409/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 409 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 409 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 409' -Direction Inbound -Protocol TCP -LocalPort 409 -Action Block
ufw
sudo ufw deny 409/udp
iptables
sudo iptables -A INPUT -p udp --dport 409 -j DROP
nftables
sudo nft add rule inet filter input udp dport 409 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 409' -Direction Inbound -Protocol UDP -LocalPort 409 -Action Block

Related ports

407timbuktu408prm-sm410decladebug411rmt

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