Use APKPure App
Get Port Scanner For Networking old version APK for Android
Scans Multiple Network ports and finds the open ports
This app is like the lite mobile version for NMAP tool.
It is used to scan the internal network as well as external networks.
Most scanned ports will be entered by default but you can change the port as your wish.
The timeout limit is set to 20-700 if you want below that or above that you can enter it manually by clicking on the textbox right to the scan button.
NO full screen ads
The results will be shown in a separate screen.
It is designed for ethical hackers, networking engineers and cyber security professionals and students only not for any illegal purpose.
Use this app only for ethical purpose.
You do not need internet connection if you are scanning internal networks.