Compare different WiFi standards (802.11a/b/g/n/ac/ax).

802.11b (1999): 2.4 GHz, DSSS, 11 Mbps max. 802.11a (1999): 5 GHz, OFDM, 54 Mbps max. 802.11g (2003): 2.4 GHz, OFDM, 54 Mbps, backward compatible with b. 802.11n/WiFi 4 (2009): 2.4/5 GHz, MIMO (up to 4 streams), 600 Mbps, channel bonding. 802.11ac/WiFi 5 (2013): 5 GHz only, MU-MIMO (downlink), 256-QAM, up to 6.9 Gbps, 80/160 MHz channels. 802.11ax/WiFi 6 (2019): 2.4/5 GHz, OFDMA, MU-MIMO (both directions), 1024-QAM, up to 9.6 Gbps, better for dense environments with BSS coloring and TWT for power saving.