How to tell if someone is using your WiFi without permission

A slow internet connection or unexpected router activity might signal that someone is using your WiFi without permission. While often blamed on internet providers, such issues can stem from everyday security oversights like weak passwords or outdated routers.

Identifying an intruder requires more than just noticing slow speeds or buffering videos. The most reliable method is to inspect the list of devices connected to your network. This can be done by accessing your router's configuration settings or using your internet provider's network management application.

Most routers display connected devices, often showing their names, brands, IP addresses, or MAC addresses. While some devices might appear with generic names like "Android," "iPhone," or "Unknown device," it's important to carefully review the list to distinguish between legitimate and unauthorized connections.

If an unfamiliar device is detected, the immediate step is to change your WiFi password. This action disconnects all current users and requires them to re-enter the new password. For enhanced security, create a strong password that is long, difficult to guess, and distinct from those used on other services. Using a phrase with a mix of words, numbers, and symbols is generally more secure than a short, simple key.

Further security measures include ensuring your router uses WPA3 encryption if available, or at least WPA2. Avoid older, weaker security protocols like WEP. It is also crucial to change the router's administrative password, which is separate from the WiFi password, and to keep the router's firmware updated. Creating a guest network for visitors can also help maintain the security of your main network.