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Port 408 (prm-sm)

IANA assigns port 408 to prm-sm: Prospero Resource Manager Sys. Man..

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
prm-sm TCP Prospero Resource Manager Sys. Man. - -
prm-sm UDP Prospero Resource Manager Sys. Man. - -

Check what is listening on port 408

Linux: is anything listening on TCP 408?
sudo ss -tlnp 'sport = :408'
Linux: UDP 408
sudo ss -ulnp 'sport = :408'
Linux / macOS: which process owns the port
sudo lsof -nP -i :408
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':408 '
Windows (Command Prompt)
netstat -ano | findstr :408
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 408 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 408
From Windows
Test-NetConnection HOST -Port 408
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 408

Block port 408 in the firewall

ufw
sudo ufw deny 408/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 408 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 408 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 408' -Direction Inbound -Protocol TCP -LocalPort 408 -Action Block
ufw
sudo ufw deny 408/udp
iptables
sudo iptables -A INPUT -p udp --dport 408 -j DROP
nftables
sudo nft add rule inet filter input udp dport 408 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 408' -Direction Inbound -Protocol UDP -LocalPort 408 -Action Block

Related ports

406imsp407timbuktu409prm-nm410decladebug

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