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// Other services

Port 4888: xcap code analysis portal public user access

Port 4888 is assigned by IANA to xcap-portal (xcap code analysis portal public user access).

4888

How xcap-portal works

Other services
client:4888xcap-portalresponse client:4888xcap-portalresponse

The client sends a request to port 4888 and the xcap-portal service answers.

Transport
TCP
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 4888 dangerous?

We have no specific security note for port 4888. 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 4888

ServicePortTransportDescriptionReferenceUpdated
xcap-portal 4888 TCP xcap code analysis portal public user access - 2018-06-06
-4888-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4888, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4888'      # process listening on 4888
sudo lsof -nP -i :4888

macOS

sudo lsof -nP -i :4888

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4888 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4888
netstat -ano | findstr :4888

From another machine

nmap -p 4888 -sV <host>
nc -zv <host> 4888

Block it in the firewall

sudo ufw deny 4888/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4888" -Direction Inbound -LocalPort 4888 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4888 used for?

Port 4888 is assigned by IANA to xcap-portal (xcap code analysis portal public user access).

Is port 4888 TCP or UDP?

Port 4888 is registered for TCP.

Is it safe to open port 4888?

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 4888 is open?

On Linux run "ss -ltnup 'sport = :4888'", on macOS "lsof -nP -i :4888", and on Windows "netstat -ano | findstr :4888" to see the local process. From another machine, "nmap -p 4888 <host>" shows whether it is reachable.

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