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Port 418 (hyper-g)

IANA assigns port 418 to hyper-g: Hyper-G.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
hyper-g TCP Hyper-G Frank Kappe -
hyper-g UDP Hyper-G Frank Kappe -

Check what is listening on port 418

Linux: is anything listening on TCP 418?
sudo ss -tlnp 'sport = :418'
Linux: UDP 418
sudo ss -ulnp 'sport = :418'
Linux / macOS: which process owns the port
sudo lsof -nP -i :418
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':418 '
Windows (Command Prompt)
netstat -ano | findstr :418
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 418 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 418
From Windows
Test-NetConnection HOST -Port 418
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 418

Block port 418 in the firewall

ufw
sudo ufw deny 418/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 418 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 418 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 418' -Direction Inbound -Protocol TCP -LocalPort 418 -Action Block
ufw
sudo ufw deny 418/udp
iptables
sudo iptables -A INPUT -p udp --dport 418 -j DROP
nftables
sudo nft add rule inet filter input udp dport 418 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 418' -Direction Inbound -Protocol UDP -LocalPort 418 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.