CyberHunter
Local dataset, no network
// Other services

Port 4008: NetCheque accounting

Port 4008 is assigned by IANA to netcheque (NetCheque accounting).

4008

How netcheque works

Other services
client:4008netchequeresponse client:4008netchequeresponse

The client sends a request to port 4008 and the netcheque 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 4008 dangerous?

We have no specific security note for port 4008. 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 4008

ServicePortTransportDescriptionReferenceUpdated
netcheque 4008 TCP, UDP NetCheque accounting - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4008, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4008'      # process listening on 4008
sudo lsof -nP -i :4008

macOS

sudo lsof -nP -i :4008

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4008 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4008
netstat -ano | findstr :4008

From another machine

nmap -p 4008 -sV <host>
sudo nmap -sU -p 4008 <host>
nc -zv <host> 4008

Block it in the firewall

sudo ufw deny 4008/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4008" -Direction Inbound -LocalPort 4008 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4008 used for?

Port 4008 is assigned by IANA to netcheque (NetCheque accounting).

Is port 4008 TCP or UDP?

Port 4008 is registered for TCP and UDP.

Is it safe to open port 4008?

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 4008 is open?

On Linux run "ss -ltnup 'sport = :4008'", on macOS "lsof -nP -i :4008", and on Windows "netstat -ano | findstr :4008" to see the local process. From another machine, "nmap -p 4008 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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