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Port 20480 (emwavemsg)

IANA assigns port 20480 to emwavemsg: emWave Message Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
emwavemsg TCP emWave Message Service Harald Striepe -
emwavemsg UDP emWave Message Service Harald Striepe -

Registry dates for this port: registered 2008-02-14.

Check what is listening on port 20480

Linux: is anything listening on TCP 20480?
sudo ss -tlnp 'sport = :20480'
Linux: UDP 20480
sudo ss -ulnp 'sport = :20480'
Linux / macOS: which process owns the port
sudo lsof -nP -i :20480
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':20480 '
Windows (Command Prompt)
netstat -ano | findstr :20480
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 20480 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 20480
From Windows
Test-NetConnection HOST -Port 20480
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 20480

Block port 20480 in the firewall

ufw
sudo ufw deny 20480/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 20480 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 20480 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 20480' -Direction Inbound -Protocol TCP -LocalPort 20480 -Action Block
ufw
sudo ufw deny 20480/udp
iptables
sudo iptables -A INPUT -p udp --dport 20480 -j DROP
nftables
sudo nft add rule inet filter input udp dport 20480 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 20480' -Direction Inbound -Protocol UDP -LocalPort 20480 -Action Block

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