CyberHunter
Local dataset, no network
// Other services

Port 20480: emWave Message Service

Port 20480 is assigned by IANA to emwavemsg (emWave Message Service).

20480

How emwavemsg works

Other services
client:20480emwavemsgresponse client:20480emwavemsgresponse

The client sends a request to port 20480 and the emwavemsg service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 20480 dangerous?

We have no specific security note for port 20480. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 20480

ServicePortTransportDescriptionReferenceUpdated
emwavemsg 20480 TCP, UDP emWave Message Service - 2008-02-14

// source: IANA service name and port number registry

03 Check it

Which program uses port 20480, and is it reachable?

Linux

sudo ss -ltnup 'sport = :20480'      # process listening on 20480
sudo lsof -nP -i :20480

macOS

sudo lsof -nP -i :20480

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 20480 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 20480
netstat -ano | findstr :20480

From another machine

nmap -p 20480 -sV <host>
sudo nmap -sU -p 20480 <host>
nc -zv <host> 20480

Block it in the firewall

sudo ufw deny 20480/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 20480" -Direction Inbound -LocalPort 20480 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 20480 used for?

Port 20480 is assigned by IANA to emwavemsg (emWave Message Service).

Is port 20480 TCP or UDP?

Port 20480 is registered for TCP and UDP.

Is it safe to open port 20480?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 20480 is open?

On Linux run "ss -ltnup 'sport = :20480'", on macOS "lsof -nP -i :20480", and on Windows "netstat -ano | findstr :20480" to see the local process. From another machine, "nmap -p 20480 <host>" shows whether it is reachable.

05 Related
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