60 Fun Facts About Wi-Fi

Wi-Fi is a family of wireless protocols based on which family of IEEE standards?

802.3 is Ethernet, 802.15 covers personal area networks and 1394 is FireWire.

The two radio bands Wi-Fi most commonly uses are 5 GHz and which other?

Newer generations add a third, higher band; each band is split into multiple channels.

Which common kitchen appliance shares Wi-Fi's most crowded radio band and can interfere with it?

A 1985 FCC ruling opened parts of the ISM bands for unlicensed use, which is why Wi-Fi shares spectrum with microwaves and cordless phones.

Which brand-consulting firm coined the name Wi-Fi in 1999?

The Wi-Fi Alliance wanted something catchier than "IEEE 802.11b Direct Sequence"; the name was picked from a list of ten.

The name Wi-Fi was partly chosen because it echoes which older consumer term?

Whether it is really short for "Wireless Fidelity" is disputed, though the Alliance briefly used that slogan.

What shape is the Wi-Fi Alliance's certification logo?

The agency that named it designed the logo too; the spellings WiFi and wifi are not approved by the Alliance.

The organisation that owns the Wi-Fi trademark was founded in 1999 under what name?

WECA's founders included 3Com, Aironet, Harris, Lucent, Nokia and Symbol; it renamed itself the Wi-Fi Alliance in 2002.

In 1991, NCR Corporation and AT&T invented the precursor to 802.11 in Nieuwegein in which country?

The product was intended for cashier systems.

What was the name of the NCR/AT&T wireless product that preceded 802.11?

One of NCR's engineers went on to chair the IEEE 802.11 committee for ten years.

Which NCR engineer chaired the IEEE 802.11 committee for ten years and is often called the father of Wi-Fi?

He and Bell Labs engineer Bruce Tuch approached the IEEE to create the standard.

Which Australian research agency built a WLAN prototype in 1992 and lodged a Wi-Fi patent that later earned it hundreds of millions of dollars?

Three countries claim to have invented Wi-Fi, and no global consensus exists.

John O'Sullivan's Australian team adapted a technique for reducing multipath interference that he had originally developed for what field?

His earlier paper on sharpening radio-telescope images fed directly into the 1996 patent.

How much was the Australian agency awarded in its 2009 Wi-Fi patent settlement with 14 technology companies?

A further $220 million followed in 2012 after proceedings against 23 more companies.

The first version of the 802.11 protocol, released in 1997, offered link speeds of up to how much?

802.11b raised it to 11 Mbit/s in 1999.

Ad hoc Wi-Fi networking, with no access point, proved especially popular for multiplayer games on which kind of device?

The Nintendo DS and PlayStation Portable both used it; digital cameras adopted it too.

Apple's 1999 iBook was the first mass consumer product with Wi-Fi. What did Apple call the feature?

It was developed with the same Lucent group that helped create the standard.

When the Wi-Fi Alliance introduced simplified generation numbers, which 802.11 standard became "Wi-Fi 4"?

802.11ac became Wi-Fi 5 and 802.11ax Wi-Fi 6.

Which antenna technology did 802.11n introduce, letting devices use several antennas at once?

Multiple-input multiple-output raised net data rates to as much as 600 Mbit/s.

Wi-Fi 6E extends Wi-Fi 6 into which additional frequency band?

Wi-Fi 6 itself, based on 802.11ax, works in the 2.4 and 5 GHz bands and adds a cellular-style feature called OFDMA.

Wi-Fi 7 is based on which IEEE amendment, dubbed Extremely High Throughput?

Development began with a draft in March 2021 and the final document was published in July 2025.

The 802.11ad amendment for the 60 GHz millimetre-wave band is sold under what brand?

Its peak rate is 7 Gbit/s, but 60 GHz signals barely pass through walls.

By 2025, the fastest Wi-Fi versions at close range could reach roughly what speed?

That is more than ten thousand times the speed of the original 1997 standard.

What does SSID stand for?

It is the network name users see; a hidden network simply stops broadcasting it.

What is the maximum length of an SSID?

Each basic service set is separately identified by a 48-bit BSSID, essentially a MAC address.

How many bits long is the MAC address that identifies every Wi-Fi station?

The address specifies both source and destination of each data packet.

The scheme by which Wi-Fi stations share a channel by transmitting only when it is sensed idle is called what?

Carrier-sense multiple access with collision avoidance cannot fully prevent collisions, which is why throughput drops on busy channels.

How many channels in Wi-Fi's lower band are permitted in the United States, compared with 13 in Europe and 14 in Japan?

Channels are numbered at 5 MHz spacing but transmitters occupy at least 20 MHz, so they overlap.

The typical indoor range of a Wi-Fi access point is about how far?

Some access points claim up to 150 metres outdoors; walls and pillars cut range sharply.

In the European Union, Wi-Fi transmitter power (EIRP) is limited to how much?

That is 20 dBm; by comparison personal-area radios have far shorter range and lower power consumption.

Wi-Fi's original encryption scheme, now easily cracked with tools like Aircrack-ng, was called what?

Wired Equivalent Privacy was ratified with the 1997 standard and later formally deprecated.

WPA2, using the Advanced Encryption Standard, was introduced in which year?

It is shorthand for the full IEEE 802.11i-2004 standard and replaced the stopgap WPA.

A key-replay flaw in WPA2 discovered in 2017 was given what name?

WPA3 was announced the following year as WPA2's replacement.

The Wi-Fi Alliance announced WPA3 in January of which year?

It rolled out on 26 June that year with several security improvements over WPA2.

A flaw revealed in December 2011 let attackers recover which router feature's PIN by brute force in 4 to 10 hours?

With the PIN, the network's WPA/WPA2 pre-shared key could be recovered; users were told to switch the feature off.

The practice of driving around logging and mapping other people's access points is known as what?

The name derives from wardialing, itself named after the 1983 Matthew Broderick film WarGames.

The 802.11 base standard is created and maintained by which body?

The IEEE does not test equipment; certification is the Wi-Fi Alliance's job.

Public-access wireless LANs, the idea behind the hotspot, were first proposed by Brett Stewart at a conference in 1993 in which city?

His later firm was among the first to sign up Starbucks, American Airlines and Hilton.

Which university built the first campus-wide wireless internet network, Wireless Andrew, in 1993?

It predated the Wi-Fi brand by six years.

Which Indian city became the country's first Wi-Fi-enabled city, in the mid-2000s?

St. Cloud, Florida and Sunnyvale, California followed as the first free citywide networks in the US in 2005.

New York City's LinkNYC project converts what into public Wi-Fi kiosks?

Installation began in late 2015, with more than 7,000 kiosks planned.

The international roaming service that lets students log on to Wi-Fi at other universities is called what?

It began in 2002 from an idea by Klaas Wierenga of the Dutch research network SURFnet.

Appending which suffix to an SSID excludes a router from Google's Wi-Fi positioning database?

Wi-Fi positioning uses known hotspot locations and signal strength when GPS is unavailable.

Wi-Fi Direct, which lets devices connect peer-to-peer without an access point, launched in which year?

The Miracast screen-casting standard is built on it.

Hedy Lamarr and George Antheil patented a frequency-hopping radio guidance system in the Second World War for what purpose?

Frequency hopping predated their patent, and operational use only began in 1962, but the idea is foundational to spread-spectrum radio.

Which 1971 University of Hawaii network gave the first public demonstration of a wireless packet data network?

Norman Abramson's team used cheap radio gear to link the islands to a central computer on Oahu.

Which short-range wireless standard is named after a 10th-century Danish king?

Intel's Jim Kardach proposed the name in 1997; the logo binds the runes for Harald's initials.

Li-Fi, which transmits data by modulating light, was named by Harald Haas at which 2011 event?

It uses LEDs rather than radio, and cannot pass through walls.

What does the World Health Organization say about the health impact of radio fields from Wi-Fi and base stations?

The WHO's cancer agency IARC nonetheless lists RF fields as "possibly carcinogenic" (Group 2B), a category for evidence that is credible but unconfirmed.

The 802.11ah standard, published in 2017, operates in which part of the spectrum to get longer range?

Its favourable propagation suits sensor networks and extended-range hotspots.

802.11b uses direct-sequence spread spectrum. What modulation do 802.11a and Wi-Fi 4, 5 and 6 use?

Orthogonal frequency-division multiplexing splits data across many closely spaced sub-carriers.

Roughly how many Wi-Fi-enabled devices were shipped globally each year as of 2019?

The Wi-Fi Alliance had more than 800 member companies by 2017.

In 2016 the Australian Wi-Fi prototype test bed was chosen as the country's contribution to which exhibition?

It was shown at the National Museum of Australia.

A 1985 FCC ruling opened the door to Wi-Fi by freeing parts of which spectrum for unlicensed use?

The same 2.4 GHz slice is used by microwave ovens, which is why interference is a fact of life.

The original WaveLAN precursor to 802.11 was designed in 1991 for use in what?

NCR and AT&T developed it in Nieuwegein, and NCR's Vic Hayes went on to chair the IEEE 802.11 committee for a decade.

Per Phil Belanger, 'Wi-Fi' was picked from a list of how many names proposed by Interbrand?

The brief was for something 'a little catchier than IEEE 802.11b Direct Sequence'; Interbrand also designed the logo.

Which Florida city, with Sunnyvale, California, first offered citywide free Wi-Fi in the US in 2005?

Both networks came from the provider MetroFi; Minneapolis's later network reportedly earned its provider $1.2 million a year.

The 382 km Wi-Fi distance record set in June 2007 linked two mountain tops in which country?

Ermanno Pietrosemoli's team moved about 3 MB per second between El Aguila and Platillon using non-standard gear.

The Swedish National Space Agency pushed Wi-Fi data 420 km to what kind of target?

It took 6-watt amplifiers to reach the balloon overhead, far beyond the 20 m indoor range of a normal access point.

Using someone else's wireless connection without permission by getting within range is called what?

It often happens by accident when a router is left on default 'unsecured' settings and a laptop auto-connects.

What is the main drawback of each extra hop through a wireless range extender?

Any device on the chain is also limited by the 'weakest link' between it and the network's origin.