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// Other services

Port 4688: Mobile P2P Service

Port 4688 is assigned by IANA to mobile-p2p (Mobile P2P Service).

4688

How mobile-p2p works

Other services
client:4688mobile-p2presponse client:4688mobile-p2presponse

The client sends a request to port 4688 and the mobile-p2p 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 4688 dangerous?

We have no specific security note for port 4688. 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 4688

ServicePortTransportDescriptionReferenceUpdated
mobile-p2p 4688 TCP, UDP Mobile P2P Service - 2008-12-04

// source: IANA service name and port number registry

03 Check it

Which program uses port 4688, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4688'      # process listening on 4688
sudo lsof -nP -i :4688

macOS

sudo lsof -nP -i :4688

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4688 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4688
netstat -ano | findstr :4688

From another machine

nmap -p 4688 -sV <host>
sudo nmap -sU -p 4688 <host>
nc -zv <host> 4688

Block it in the firewall

sudo ufw deny 4688/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4688" -Direction Inbound -LocalPort 4688 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4688 used for?

Port 4688 is assigned by IANA to mobile-p2p (Mobile P2P Service).

Is port 4688 TCP or UDP?

Port 4688 is registered for TCP and UDP.

Is it safe to open port 4688?

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 4688 is open?

On Linux run "ss -ltnup 'sport = :4688'", on macOS "lsof -nP -i :4688", and on Windows "netstat -ano | findstr :4688" to see the local process. From another machine, "nmap -p 4688 <host>" shows whether it is reachable.

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