CyberHunter
Local dataset, no network
// Other services

Port 2742: TSB2

Port 2742 is assigned by IANA to tsb2 (TSB2).

2742

How tsb2 works

Other services
client:2742tsb2response client:2742tsb2response

The client sends a request to port 2742 and the tsb2 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 2742 dangerous?

We have no specific security note for port 2742. 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 2742

ServicePortTransportDescriptionReferenceUpdated
tsb2 2742 TCP, UDP TSB2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2742, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2742'      # process listening on 2742
sudo lsof -nP -i :2742

macOS

sudo lsof -nP -i :2742

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2742 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2742
netstat -ano | findstr :2742

From another machine

nmap -p 2742 -sV <host>
sudo nmap -sU -p 2742 <host>
nc -zv <host> 2742

Block it in the firewall

sudo ufw deny 2742/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2742" -Direction Inbound -LocalPort 2742 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2742 used for?

Port 2742 is assigned by IANA to tsb2 (TSB2).

Is port 2742 TCP or UDP?

Port 2742 is registered for TCP and UDP.

Is it safe to open port 2742?

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 2742 is open?

On Linux run "ss -ltnup 'sport = :2742'", on macOS "lsof -nP -i :2742", and on Windows "netstat -ano | findstr :2742" to see the local process. From another machine, "nmap -p 2742 <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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