CyberHunter
Local dataset, no network
// Other services

Port 5405: NetSupport

Port 5405 is assigned by IANA to netsupport (NetSupport).

5405

How netsupport works

Other services
client:5405netsupportresponse client:5405netsupportresponse

The client sends a request to port 5405 and the netsupport 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 5405 dangerous?

We have no specific security note for port 5405. 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 5405

ServicePortTransportDescriptionReferenceUpdated
netsupport 5405 TCP, UDP NetSupport - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5405, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5405'      # process listening on 5405
sudo lsof -nP -i :5405

macOS

sudo lsof -nP -i :5405

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5405 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5405
netstat -ano | findstr :5405

From another machine

nmap -p 5405 -sV <host>
sudo nmap -sU -p 5405 <host>
nc -zv <host> 5405

Block it in the firewall

sudo ufw deny 5405/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5405" -Direction Inbound -LocalPort 5405 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5405 used for?

Port 5405 is assigned by IANA to netsupport (NetSupport).

Is port 5405 TCP or UDP?

Port 5405 is registered for TCP and UDP.

Is it safe to open port 5405?

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 5405 is open?

On Linux run "ss -ltnup 'sport = :5405'", on macOS "lsof -nP -i :5405", and on Windows "netstat -ano | findstr :5405" to see the local process. From another machine, "nmap -p 5405 <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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