CyberHunter
Local dataset, no network
// Other services

Port 2128: Net Steward Control

Port 2128 is assigned by IANA to net-steward (Net Steward Control).

2128

How net-steward works

Other services
client:2128net-stewardresponse client:2128net-stewardresponse

The client sends a request to port 2128 and the net-steward 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 2128 dangerous?

We have no specific security note for port 2128. 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 2128

ServicePortTransportDescriptionReferenceUpdated
net-steward 2128 TCP, UDP Net Steward Control - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2128, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2128'      # process listening on 2128
sudo lsof -nP -i :2128

macOS

sudo lsof -nP -i :2128

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2128 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2128
netstat -ano | findstr :2128

From another machine

nmap -p 2128 -sV <host>
sudo nmap -sU -p 2128 <host>
nc -zv <host> 2128

Block it in the firewall

sudo ufw deny 2128/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2128" -Direction Inbound -LocalPort 2128 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2128 used for?

Port 2128 is assigned by IANA to net-steward (Net Steward Control).

Is port 2128 TCP or UDP?

Port 2128 is registered for TCP and UDP.

Is it safe to open port 2128?

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 2128 is open?

On Linux run "ss -ltnup 'sport = :2128'", on macOS "lsof -nP -i :2128", and on Windows "netstat -ano | findstr :2128" to see the local process. From another machine, "nmap -p 2128 <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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