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// Other services

Port 43188: REACHOUT

Port 43188 is assigned by IANA to reachout (REACHOUT).

43188

How reachout works

Other services
client:43188reachoutresponse client:43188reachoutresponse

The client sends a request to port 43188 and the reachout 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 43188 dangerous?

We have no specific security note for port 43188. 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 43188

ServicePortTransportDescriptionReferenceUpdated
reachout 43188 TCP, UDP REACHOUT - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 43188, and is it reachable?

Linux

sudo ss -ltnup 'sport = :43188'      # process listening on 43188
sudo lsof -nP -i :43188

macOS

sudo lsof -nP -i :43188

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 43188 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 43188
netstat -ano | findstr :43188

From another machine

nmap -p 43188 -sV <host>
sudo nmap -sU -p 43188 <host>
nc -zv <host> 43188

Block it in the firewall

sudo ufw deny 43188/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 43188" -Direction Inbound -LocalPort 43188 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 43188 used for?

Port 43188 is assigned by IANA to reachout (REACHOUT).

Is port 43188 TCP or UDP?

Port 43188 is registered for TCP and UDP.

Is it safe to open port 43188?

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 43188 is open?

On Linux run "ss -ltnup 'sport = :43188'", on macOS "lsof -nP -i :43188", and on Windows "netstat -ano | findstr :43188" to see the local process. From another machine, "nmap -p 43188 <host>" shows whether it is reachable.

05 Related
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