CyberHunter
Local dataset, no network
// Other services

Port 40000: SafetyNET p

Port 40000 is assigned by IANA to safetynetp (SafetyNET p).

40000

How safetynetp works

Other services
client:40000safetynetpresponse client:40000safetynetpresponse

The client sends a request to port 40000 and the safetynetp 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 40000 dangerous?

We have no specific security note for port 40000. 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 40000

ServicePortTransportDescriptionReferenceUpdated
safetynetp 40000 TCP, UDP SafetyNET p - 2022-12-15

// source: IANA service name and port number registry

03 Check it

Which program uses port 40000, and is it reachable?

Linux

sudo ss -ltnup 'sport = :40000'      # process listening on 40000
sudo lsof -nP -i :40000

macOS

sudo lsof -nP -i :40000

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 40000 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 40000
netstat -ano | findstr :40000

From another machine

nmap -p 40000 -sV <host>
sudo nmap -sU -p 40000 <host>
nc -zv <host> 40000

Block it in the firewall

sudo ufw deny 40000/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 40000" -Direction Inbound -LocalPort 40000 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 40000 used for?

Port 40000 is assigned by IANA to safetynetp (SafetyNET p).

Is port 40000 TCP or UDP?

Port 40000 is registered for TCP and UDP.

Is it safe to open port 40000?

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 40000 is open?

On Linux run "ss -ltnup 'sport = :40000'", on macOS "lsof -nP -i :40000", and on Windows "netstat -ano | findstr :40000" to see the local process. From another machine, "nmap -p 40000 <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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