NetMon is the first tool for you to
– Scan and Speedtest all your 3G/4G/WiFi networks to discover hosts via the Ping/TCP/UDP scan.
– Monitor TCP/UDP open ports created by other apps in you device.
You can also know the detailed information about your network, including gateway IP, subnet mask, WAN IP, DNS servers, and the RTT latency between your device to other hosts.
Understanding Open Ports in Android Applications: Discovery, Diagnosis, and Security Assessment
Daoyuan Wu, Debin Gao, Rocky K. C. Chang, En He, Eric K. T. Cheng, and Robert H. Deng
In Proc. ISOC Network and Distributed System Security Symposium (NDSS), San Diego, USA, 2019. (AR = 89/521 = 17%)