CyberHunter
Local dataset, no network
// Other services

Port 4802: Icona License System Server

Port 4802 is assigned by IANA to ilss (Icona License System Server).

4802

How ilss works

Other services
client:4802ilssresponse client:4802ilssresponse

The client sends a request to port 4802 and the ilss 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 4802 dangerous?

We have no specific security note for port 4802. 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 4802

ServicePortTransportDescriptionReferenceUpdated
ilss 4802 TCP, UDP Icona License System Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4802, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4802'      # process listening on 4802
sudo lsof -nP -i :4802

macOS

sudo lsof -nP -i :4802

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4802 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4802
netstat -ano | findstr :4802

From another machine

nmap -p 4802 -sV <host>
sudo nmap -sU -p 4802 <host>
nc -zv <host> 4802

Block it in the firewall

sudo ufw deny 4802/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4802" -Direction Inbound -LocalPort 4802 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4802 used for?

Port 4802 is assigned by IANA to ilss (Icona License System Server).

Is port 4802 TCP or UDP?

Port 4802 is registered for TCP and UDP.

Is it safe to open port 4802?

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 4802 is open?

On Linux run "ss -ltnup 'sport = :4802'", on macOS "lsof -nP -i :4802", and on Windows "netstat -ano | findstr :4802" to see the local process. From another machine, "nmap -p 4802 <host>" shows whether it is reachable.

05 Related
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