Developer Builds Python Network Scanner on Unrooted Android Using Termux

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A developer has shared a method for running a network port and DNS scanner entirely on an unrooted Android device using Termux and Python. The project uses the Scapy library to craft custom TCP SYN packets and UDP DNS queries to probe target hosts for open ports and active DNS servers. The scanner checks a predefined list of common ports, including 80, 443, and 8080, and identifies open ones by detecting SYN-ACK responses. Because Scapy requires raw packet access, the setup may encounter socket restrictions on unrooted devices, though standard TCP/UDP scripting still functions as a lightweight learning environment. The project demonstrates how a smartphone can serve as a portable network analysis tool without requiring root access.

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