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// Other services

Port 7900: Multicast Event

Port 7900 is assigned by IANA to mevent (Multicast Event).

7900

How mevent works

Other services
client:7900meventresponse client:7900meventresponse

The client sends a request to port 7900 and the mevent 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 7900 dangerous?

We have no specific security note for port 7900. 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 7900

ServicePortTransportDescriptionReferenceUpdated
mevent 7900 TCP, UDP Multicast Event - 2006-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 7900, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7900'      # process listening on 7900
sudo lsof -nP -i :7900

macOS

sudo lsof -nP -i :7900

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7900 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7900
netstat -ano | findstr :7900

From another machine

nmap -p 7900 -sV <host>
sudo nmap -sU -p 7900 <host>
nc -zv <host> 7900

Block it in the firewall

sudo ufw deny 7900/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7900" -Direction Inbound -LocalPort 7900 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7900 used for?

Port 7900 is assigned by IANA to mevent (Multicast Event).

Is port 7900 TCP or UDP?

Port 7900 is registered for TCP and UDP.

Is it safe to open port 7900?

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 7900 is open?

On Linux run "ss -ltnup 'sport = :7900'", on macOS "lsof -nP -i :7900", and on Windows "netstat -ano | findstr :7900" to see the local process. From another machine, "nmap -p 7900 <host>" shows whether it is reachable.

05 Related
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