Wifi Frequencies

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Wifi Frequencies used in Wireless Fidelity (Wi-Fi) are controlled by International Treaties, but the IEEE 802.1 Working Group defines the following frequencies:

IEEE 802.11 variant	Frequency bands used
802.11a	5GHz
802.11b	2.4GHz
802.11g	2.4GHz
802.11n	2.4 & 5 GHz
802.11ac	Below 6GHz
802.11ad	Up to 60 GHz
802.11af	TV white space (below 1 GHz)
802.11ah	700 MHz, 860MHz, 902 MHz, etc. ISM bands dependent upon country and allocations

Source: https://www.electronics-notes.com/articles/connectivity/wifi-ieee-802-11/channels-frequencies-bands-bandwidth.php