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// Other services

Port 4100: IGo Incognito Data Port

Port 4100 is assigned by IANA to igo-incognito (IGo Incognito Data Port).

4100

How igo-incognito works

Other services
client:4100igo-incognitoresponse client:4100igo-incognitoresponse

The client sends a request to port 4100 and the igo-incognito 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 4100 dangerous?

We have no specific security note for port 4100. 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 4100

ServicePortTransportDescriptionReferenceUpdated
igo-incognito 4100 TCP, UDP IGo Incognito Data Port - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 4100, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4100'      # process listening on 4100
sudo lsof -nP -i :4100

macOS

sudo lsof -nP -i :4100

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4100 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4100
netstat -ano | findstr :4100

From another machine

nmap -p 4100 -sV <host>
sudo nmap -sU -p 4100 <host>
nc -zv <host> 4100

Block it in the firewall

sudo ufw deny 4100/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4100" -Direction Inbound -LocalPort 4100 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4100 used for?

Port 4100 is assigned by IANA to igo-incognito (IGo Incognito Data Port).

Is port 4100 TCP or UDP?

Port 4100 is registered for TCP and UDP.

Is it safe to open port 4100?

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 4100 is open?

On Linux run "ss -ltnup 'sport = :4100'", on macOS "lsof -nP -i :4100", and on Windows "netstat -ano | findstr :4100" to see the local process. From another machine, "nmap -p 4100 <host>" shows whether it is reachable.

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