The SSID, or Service Set Identifier, is the name of a Wi-Fi network and can be up to 32 characters long. It is important to choose a name that is easy to identify but does not include personal details like names, addresses, or apartment numbers. While the SSID is visible to anyone within range, the security of a Wi-Fi network depends more on its encryption type (such as WPA2 or WPA3) and the strength of the password. The French national cyber-security agency, ANSSI, recommends not keeping the default SSID, as it might reveal the brand or model of the router, potentially exposing known weaknesses. Default SSID names for home or professional networks often include the router’s name or brand followed by an alphanumeric code. For example, common prefixes like "Bbox-" or "Livebox-" are used by some providers. To find the current SSID, users can check the label on the router, scan a QR code on newer devices, look at a connected device, or access the router's administrator interface through a web browser. Specific URLs for this access may include mabbox.bytel.fr or mafreebox.freebox.fr, depending on the router model. Changing the SSID can improve both security and network organization. This is typically done through the router's administration interface, which is often accessed via URLs like 192.168.1.1 or 192.168.0.1. It is important to ensure the new SSID is valid—using only letters and numbers and not exceeding 32 characters. Once changed, all connected devices must reconnect using the new network name. Additional security practices include separating the main network from guest networks, regularly updating router firmware, disabling WPS (Wi-Fi Protected Setup), using strong passwords, and enabling WPA3 encryption when available. While hiding the SSID might seem like a way to improve security, the ANSSI advises against it. Hidden networks can still be discovered by devices that have connected to them before, which will then broadcast the name. New devices must manually enter the SSID, which can be inconvenient and may lead to errors. Therefore, the best approach is to choose a secure, non-default SSID that is easy to manage and recognize.