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Standards & Generations

The IEEE 802.11 standards, the Wi-Fi generations, and the bodies that define them.

Overview

Wi-Fi is not one thing. It is a layered standard maintained by an engineering body, a set of marketing generations applied by an industry trade group, and a block of radio spectrum granted by national regulators inside a global treaty. Three organizations own those three jobs, and confusing them is the most common mistake in wireless. This page maps the IEEE 802.11 amendments (a, b, g, n, ac, ax, be, and the in-progress bn) to the Wi-Fi Alliance generation numbers (Wi-Fi 4 through Wi-Fi 8) and explains why ITU-R sits underneath all of it. Every rate quoted below is the theoretical PHY maximum from the standard, not what you will see on a real link. For the security amendments that ride on top of these PHY standards, see History, and for term definitions see the Glossary.

Three bodies, three jobs

The cleanest way to keep this straight is to remember that one group writes the standard, one group certifies and brands the products, and one group hands out the spectrum.

The IEEE 802.11 Working Group writes the technical standard. It is part of the IEEE 802 LAN/MAN Standards Committee (LMSC), the same committee that gave us 802.3 Ethernet. The working group develops the base 802.11 standard and the lettered amendments through Task Groups, each running drafts through repeated working-group letter ballots to build consensus before the standard is ratified. The amendments are letters (a, b, g, n, ac, ax, be, bn) precisely because they amend the base document; they are eventually rolled into a consolidated revision such as 802.11-2020. The IEEE defines the radio behavior, the frame formats, and the maximum data rates, but it does not test commercial products.

The Wi-Fi Alliance is the industry trade group that certifies interoperability and owns the "Wi-Fi" trademark. A device that passes its test suite earns a Wi-Fi CERTIFIED logo, which is the buyer's assurance that two vendors' gear will actually talk to each other. In October 2018 the Alliance introduced the simple generation numbers (Wi-Fi 4, 5, 6) to replace the alphabet soup, so a shopper no longer has to know that "802.11ax" is newer than "802.11ac." The generation numbers are branding, not engineering: they map to IEEE amendments but are assigned by the Alliance, not the IEEE.

The ITU-R (the Radiocommunication Sector of the International Telecommunication Union, a United Nations agency) manages the global radio-frequency spectrum. Its Radio Regulations are a binding international treaty, revised every four years at a World Radiocommunication Conference (WRC), that decides which services may use which frequencies. ITU-R divides the world into three regions for allocation: Region 1 (Europe, Africa, the Middle East west of the Persian Gulf, and the former Soviet states), Region 2 (the Americas), and Region 3 (most of Asia and Oceania). Neither IEEE nor the Wi-Fi Alliance can grant spectrum; they design for the unlicensed bands that ITU-R and national regulators (the FCC in the United States, CEPT/ETSI in Europe, ISED in Canada, Ofcom in the United Kingdom) make available. That is why the 6 GHz band became usable for Wi-Fi only after regulators opened it, not when the IEEE finished the radio design.

The generation timeline

IEEE 802.11 amendments and Wi-Fi Alliance generations year published / band(s) / theoretical max PHY rate 1999 802.11b 2.4 GHz 11 Mb/s 1999 802.11a 5 GHz 54 Mb/s 2003 802.11g 2.4 GHz 54 Mb/s 2009 802.11n Wi-Fi 4 2.4 + 5 GHz 600 Mb/s 2013 802.11ac Wi-Fi 5 5 GHz 6.9 Gb/s 2021 802.11ax Wi-Fi 6 / 6E 2.4 + 5 + 6 GHz 9.6 Gb/s 2024 802.11be Wi-Fi 7 2.4 + 5 + 6 GHz 23 Gb/s ~2028 802.11bn Wi-Fi 8 in progress
Wi-Fi generations on a single timeline. Branded generations (Wi-Fi 4 onward) are colored; the early lettered amendments (a/b/g) predate the generation numbering. Rates are theoretical maximum PHY rates, not real throughput. 802.11bn is still in development.

The early amendments: a, b, g

The base 802.11 standard was published in 1997 and topped out at 1 to 2 Mb/s in the 2.4 GHz band. It was too slow to matter commercially, and the market really began with the two 1999 amendments that the Wi-Fi Alliance certified as the first "Wi-Fi."

802.11b (1999) stayed in the crowded 2.4 GHz ISM band and reached 11 Mb/s using complementary code keying (CCK) over direct-sequence spread spectrum. It was the cheap, long-range option that put Wi-Fi in homes. 802.11a (1999) jumped to the cleaner 5 GHz band and reached 54 Mb/s using orthogonal frequency-division multiplexing (OFDM), the modulation that every later generation builds on. Because 5 GHz hardware was costly and the two bands do not interoperate, 802.11a stayed mostly in enterprise gear. 802.11g (2003) resolved the split by bringing 802.11a's 54 Mb/s OFDM down into the 2.4 GHz band while remaining backward compatible with 802.11b, which is why 2.4 GHz devices of that era are described as "b/g." None of these three carry a Wi-Fi generation number; the numbering scheme was applied later and started at Wi-Fi 4.

The numbered generations: n, ac, ax

802.11n (2009) is Wi-Fi 4. It was the first dual-band amendment, working in both 2.4 GHz and 5 GHz, and the first to use multiple-input multiple-output (MIMO) with multiple spatial streams plus optional 40 MHz channels, lifting the theoretical maximum to 600 Mb/s. 802.11ac (2013) is Wi-Fi 5. It operates only in the 5 GHz band and pushed throughput with wider channels (up to 160 MHz), denser 256-QAM modulation, more spatial streams, and downlink multi-user MIMO, reaching a theoretical maximum of about 6.9 Gb/s in its widest configuration.

802.11ax (2021) is Wi-Fi 6, with a theoretical maximum near 9.6 Gb/s. Its headline change was not raw speed but efficiency in crowded environments: orthogonal frequency-division multiple access (OFDMA) lets one channel serve many clients at once, 1024-QAM packs more bits per symbol, and target wake time saves battery on IoT devices. When the unlicensed 6 GHz band was opened to Wi-Fi, the Wi-Fi Alliance branded 802.11ax devices that can use it as Wi-Fi 6E ("E" for extended), a designation it announced in January 2020. Wi-Fi 6E is the same 802.11ax radio standard; the "6E" label simply signals 6 GHz capability, which depends on the local regulator having released that spectrum.

The newest: be and the in-progress bn

802.11be (the standard, IEEE 802.11be-2024) is Wi-Fi 7. The Wi-Fi Alliance launched its Wi-Fi CERTIFIED 7 program in January 2024 once the technical requirements were essentially settled, and the IEEE published the finished standard in 2024 to 2025. Wi-Fi 7 works across 2.4, 5, and 6 GHz and reaches a theoretical maximum around 23 Gb/s in a single band. Its three big additions are 320 MHz channels (double Wi-Fi 6's 160 MHz), 4096-QAM (12 bits per symbol, roughly 20 percent more than Wi-Fi 6's 1024-QAM), and multi-link operation (MLO), which lets a device use more than one band at the same time for higher throughput and lower latency.

802.11bn is the in-progress amendment that the Wi-Fi Alliance is expected to brand Wi-Fi 8. Inside the IEEE it is being developed under the theme "Ultra High Reliability" (UHR), and its focus is reliability, latency, and seamless roaming rather than another headline jump in peak rate; it is expected to keep 320 MHz channels and 4096-QAM. The IEEE timeline targets completion around 2028. Because it is unfinished, no shipping product is genuinely "Wi-Fi 8" yet, and any rate figure for it is provisional. Treat marketing claims for unratified standards with caution: until the IEEE ratifies the amendment and the Wi-Fi Alliance opens certification, "support" is a vendor's prediction, not a guarantee of interoperability.

Why this matters in the field

Knowing the generation of a target network tells you which bands to scan and what the radios can do, but it tells you almost nothing about how secure the network is. The PHY generation (n, ac, ax, be) and the security suite (WEP, WPA, WPA2, WPA3) are independent axes: a brand-new Wi-Fi 7 access point can still be configured with WPA2-Personal and a weak passphrase, and an old 802.11n access point can run WPA3. When you survey, record both. The generation drives where you listen (a 6 GHz-only Wi-Fi 6E or Wi-Fi 7 network is invisible to a radio that only tunes 2.4 and 5 GHz, which is a common reason a network seems to "disappear"). The security suite drives which technique applies. For the security side of the story, walk the History page, and for the attacks tied to each suite see the Wireless Attack Catalog and the per-suite labs such as WPA2-Personal and WPA3-Personal.

Sources

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