Wi-Fi Generations — Quick Reference Notes

Overview Table

Generation	IEEE Standard	Year	Freq. Band(s)	Max Theoretical Speed	Key Feature
Wi-Fi 1	802.11b	1999	2.4 GHz	11 Mbps	First widespread standard
Wi-Fi 2	802.11a	1999	5 GHz	54 Mbps	Higher freq, less range
Wi-Fi 3	802.11g	2003	2.4 GHz	54 Mbps	Backward compat with 802.11b
Wi-Fi 4	802.11n	2009	2.4 / 5 GHz	600 Mbps	MIMO introduced
Wi-Fi 5	802.11ac	2013	5 GHz	3.5 Gbps	MU-MIMO, beamforming
Wi-Fi 6	802.11ax	2019	2.4 / 5 GHz	9.6 Gbps	OFDMA, better dense environments
Wi-Fi 6E	802.11ax (ext.)	2021	2.4 / 5 / 6 GHz	9.6 Gbps	Adds 6 GHz band (1200 MHz more spectrum)
Wi-Fi 7	802.11be	2024	2.4 / 5 / 6 GHz	46 Gbps	MLO, 320 MHz channels, 4K-QAM

Speed: up to 11 Mbps
Band: 2.4 GHz only
Range: ~35m indoors
Notes: The one that started it all. Slow by today's standards. Vulnerable to microwave/Bluetooth interference on 2.4 GHz.

Speed: up to 54 Mbps
Band: 5 GHz only
Range: ~35m indoors (shorter than 802.11b due to higher frequency)
Notes: Released same year as 802.11b but less popular — 5 GHz gear was expensive and incompatible with 802.11b devices.

Speed: up to 54 Mbps
Band: 2.4 GHz
Range: ~38m indoors
Notes: Same max speed as 802.11a but backward compatible with 802.11b. Became the dominant standard for years.

Speed: up to 600 Mbps (theoretical), typically 100–300 Mbps real-world
Band: 2.4 GHz and/or 5 GHz (dual-band)
Range: ~70m indoors
Key tech: MIMO (Multiple Input Multiple Output) — uses multiple antennas for parallel data streams
Notes: Big leap. Dual-band support was a game changer. First generation named retroactively "Wi-Fi 4" by Wi-Fi Alliance in 2018.

Speed: up to 3.5 Gbps (Wave 2), typically 400–900 Mbps real-world
Band: 5 GHz only
Range: ~35m indoors (5 GHz = shorter range)
Key tech:
MU-MIMO (Multi-User MIMO) — simultaneous streams to multiple devices
Beamforming — focuses signal toward client device
80/160 MHz channel width
Notes: The "gigabit Wi-Fi" era. Most home routers from 2015–2020 are Wi-Fi 5. No 2.4 GHz operation (that falls back to 802.11n).

Speed: up to 9.6 Gbps, typically 600 Mbps–1.2 Gbps real-world
Bands: 2.4 GHz + 5 GHz
Key tech:
OFDMA (Orthogonal Frequency Division Multiple Access) — divides channels into sub-channels, serves multiple devices simultaneously — huge improvement in crowded environments (airports, stadiums, offices)
TWT (Target Wake Time) — devices negotiate when to wake up and communicate, massively improves battery life on IoT devices
BSS Coloring — reduces interference from neighboring networks
1024-QAM — denser data encoding
Notes: The focus shifted from raw speed to efficiency. Wi-Fi 6 shines when many devices are connected at once.

Speed: same as Wi-Fi 6 (9.6 Gbps theoretical)
Bands: 2.4 GHz + 5 GHz + 6 GHz (new!)
Key addition: Access to the 6 GHz band — opens up ~1200 MHz of new, clean spectrum (compared to the congested 2.4/5 GHz bands)
Notes: The "E" stands for Extended. Less interference, more available channels. Requires both router AND device to support 6E. Not all countries have unlocked the 6 GHz band.

Speed: up to 46 Gbps theoretical, expected 4–10 Gbps real-world
Bands: 2.4 GHz + 5 GHz + 6 GHz
Key tech:
MLO (Multi-Link Operation) — device connects to multiple bands simultaneously and aggregates throughput, also improves latency and reliability
320 MHz channels — double the max channel width of Wi-Fi 6/6E
4096-QAM (4K-QAM) — even denser encoding, ~20% more throughput vs 1024-QAM
16×16 MU-MIMO — up to 16 spatial streams (Wi-Fi 6 had 8)
Multi-RU puncturing — can use channels even if part of the spectrum is occupied
Latency: Sub-millisecond latency targeted — relevant for gaming, VR, XR
Notes: The biggest leap in a while. MLO is the headline feature. Ecosystem still maturing in 2024/2025.

Gen	Good real-world throughput
Wi-Fi 4	50–150 Mbps
Wi-Fi 5	200–500 Mbps
Wi-Fi 6	600–1200 Mbps
Wi-Fi 6E	1–2 Gbps (on 6 GHz, short range)
Wi-Fi 7	2–8 Gbps (depends heavily on setup)

Theoretical vs. real-world: Theoretical max speeds assume perfect lab conditions. Real-world is typically 30–60% of theoretical.

Term	Meaning
MIMO	Multiple antennas send/receive simultaneously → more throughput
MU-MIMO	Multiple devices get their own spatial streams simultaneously
OFDMA	Channel split into sub-channels, serves many devices at once
Beamforming	Signal focused toward a specific device instead of broadcasting everywhere
TWT	Devices agree on a sleep/wake schedule → better IoT battery life
MLO	Simultaneous multi-band operation (Wi-Fi 7 exclusive)
QAM	How densely data is packed into a signal (higher = more data, needs cleaner signal)
Channel width	Wider = more data throughput, but more prone to interference

Band	Range	Speed potential	Congestion	Wall penetration
2.4 GHz	Long	Low	High (everyone uses it)	Good
5 GHz	Medium	High	Medium	OK
6 GHz	Short	Very high	Low (new, clean)	Poor

Notes compiled May 2025 — Wi-Fi 7 ecosystem still evolving.