In macOS you can use the built-in Wi-Fi Scan from the Wireless Diagnostics.app to find the best possible or least busy channels and bandwidth frequencies for your own Wi-Fi (or there is the open source tool to do the same). • ALT+Click the “Wi-Fi”-Icon in the macOS menu bar to show advanced Wi-Fi options • From the menu, select “Open Wireless Diagnostics” • In the menu bar go to “Window” and select “Scan” from the list (or use ALT+CMD+4) • Start a scan via the “Scan now” button • After a short period you will have a nice overview of all Wi-Fi networks around you and even some recommendations for channels & bandwidths to use in your environment.

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Before you change your settings, follow these steps: • Make sure that your Wi–Fi router's firmware is up to date. For AirPort Time Capsule, AirPort Extreme, or AirPort Express Base Station,. • Make sure that your Wi-Fi devices support the settings this article recommends. • If possible, back up your Wi–Fi router's settings.

• Forget or remove the Wi-Fi settings for your network from any devices that connect to your Wi-Fi router. This will prevent the devices from attempting to connect to your network with the old configuration. You'll need to reconnect these devices to your network when you're done applying the new settings. • Configure all Wi–Fi routers on the same network with the same settings. Otherwise, devices could have difficulty connecting to your network, or your network could become unreliable. • If you're using a dual-band Wi–Fi router, configure both bands to have the same settings, unless otherwise noted below. The SSID (service set identifier), or network name, identifies your Wi-Fi network to users and other Wi-Fi devices. It is case sensitive.

For the best wireless experience, choose a wireless channel that isn't in use by any of your neighbors. Many routers use the same channel by default. Unless you know to test for and change the Wi-Fi channel when you first install your router, you could be using the same channel as someone nearby.

Set to: Any unique name Choose a name that's unique to your network and isn't shared by other nearby networks or networks you're likely to encounter. If your router came with a default SSID, it's especially important that you change it to a different, unique name.

Some common default SSID names to avoid are linksys, netgear, dlink, wireless, 2wire, and default. If your SSID isn't unique, Wi-Fi devices will have trouble identifying your network. This could cause them to fail to automatically connect to your network, or to connect to other networks that share the same SSID. It might also prevent Wi-Fi devices from using all routers in your network, or prevent them from using all available bands of a router.

Restricts access to a Wi-Fi router to devices with specific MAC (Media Access Control) addresses. Set to: Disabled When enabled, this feature allows a user to configure a list of MAC addresses for the Wi-Fi router, and restrict access to devices with addresses that are on the list. Devices with MAC addresses not on the list will fail to associate with the Wi-Fi network.

MAC addresses can be changed easily, so don't rely on them to prevent unauthorized access to the network. IOS 8 and later uses a randomized MAC address when running Wi-Fi scans. The scans are conducted when a device isn't associated with a Wi-Fi network and its processor is asleep.

A device’s processor goes to sleep shortly after the screen is turned off. Wi-Fi scans are run to determine if a user can connect to a preferred Wi-Fi network. Enhanced Wi-Fi scans are run when a device uses for apps that use geofencing, such as location-based reminders, that determine if the device is near a specific location. The security setting controls the type of authentication and encryption used by your Wi-Fi router, which allows you to control access to the network and specify the level of privacy for data you send over the air. Set to: WPA2 Personal (AES) WPA2 Personal (AES) is currently the strongest form of security offered by Wi-Fi products, and is recommended for all uses.

When enabling WPA2, be sure to select a that can't be guessed by third parties. If you have older Wi-Fi devices that don't support WPA2 Personal (AES), a good second choice is WPA/WPA2 Mode, also known as WPA Mixed Mode. This mode allows newer devices to use the stronger WPA2 AES encryption, while still allowing older devices to connect with older WPA TKIP-level encryption. If your Wi-Fi router doesn't support WPA/WPA2 Mode, WPA Personal (TKIP) mode is the next best choice. For compatibility, reliability,, and security reasons, WEP is not recommended.

WEP is insecure and functionally obsolete. If you must choose between WEP and TKIP, choose TKIP. Due to serious security weaknesses, the WEP and WPA TKIP encryption methods are deprecated and strongly discouraged. Use these modes only if necessary to support legacy Wi-Fi devices that don't support WPA2 AES and can't be upgraded to support WPA2 AES. Devices using these deprecated encryption methods can't take full advantage of the performance and other features of 802.11n and 802.11ac. As a result, the Wi-Fi Alliance has directed the Wi-Fi industry to phase out WEP and WPA TKIP.