SelfishNet v0.1 beta is a classic Windows-based network management tool used to monitor and control the internet bandwidth of devices on a local network
While SelfishNet is a powerful tool for home management, it comes with responsibilities:
Even in v0.1 beta, the tool could capture unencrypted traffic. In 2025, most websites use HTTPS, but back in the XP/Vista era, HTTP was rampant. SelfishNet could easily capture login credentials for forums, email accounts (POP3/IMAP without SSL), and FTP servers.
Only use SelfishNet on networks that you own or have explicit permission to manage. Using it on public Wi-Fi or corporate networks without authorization can be seen as a cyberattack. selfishnet v0.1 beta
The software falsely tells all other devices: "I am the default router/gateway."
Despite its age and experimental "Beta" status, SelfishNet v0.1 remains popular due to its straightforward utility and distinct feature set:
It only works for devices connected to the same network (e.g., home Wi-Fi) and cannot control devices on a different subnet. SelfishNet v0
For more persistent network "hogs," SelfishNet provides a nuclear option. By selecting the "Block" checkbox for a specific device, you can completely disconnect that user from the internet until you decide to unblock them. This is an incredibly effective way to deal with unauthorized users or to ensure a lag-free gaming session or an important video conference.
Control your internet bandwidth with SelfishNet v3. - GitHub
Discover that natively supports Windows 11. Only use SelfishNet on networks that you own
Tools like SelfishNet forced router manufacturers to implement . Features like "Static ARP tables" and "Wi-Fi Protected Setup (WPS) lockdown" became standard. Without these beta tools exposing the vulnerability, progress would have been slower.
To get the tool running correctly on modern systems, follow these standard setup steps:
If you want to explore network management further, let me know:
Whether you view it as a hero for reclaiming a lag-filled connection or a villain for its ability to block others, Selfishnet was a pioneer. For those exploring network fundamentals, it serves as a practical, if crude, introduction to concepts like ARP spoofing and bandwidth shaping. While more modern and reliable options are now available, Selfishnet remains a notable and powerful example of what can be accomplished with a few hundred kilobytes and deep knowledge of how local networks communicate. For anyone who values control over their internet experience, understanding what Selfishnet does is a glimpse into the very foundation of how data flows in our connected world.