Unlicensed National Information Infrastructure information
The factual accuracy of parts of this article (those related to article) may be compromised due to out-of-date information. The reason given is: UNII-1 Power limit has been raised by FCC (USA). Channels 120-128 are now allowed using DFS (USA). UNII-4 now allowed (USA). 6GHz spectrum graph not present to reflect UNII 5/6/7/8 which is now active in WiFi 6E (USA).. Please help update this article to reflect recent events or newly available information.(May 2023)
Radio frequency allotment
The Unlicensed National Information Infrastructure (U-NII)[1][2] radio band, as defined by the United States Federal Communications Commission, is part of the radio frequency spectrum used by WLAN devices and by many wireless ISPs.
As of March 2021, U-NII consists of eight ranges. U-NII 1 through 4 are for 5 GHz WLAN (802.11a and newer), and 5 through 8 are for 6 GHz WLAN (802.11ax) use. U-NII 2 is further divided into three subsections.
U-NII bands and FCC regs
Name
Aliases
Freq. Range (GHz)
Bandwidth (MHz)
Max Power (mW)
Max EIRP (mW)
U-NII-1
U-NII Low / U-NII Indoor
5.150–5.250
100
50
200
U-NII-2A
U-NII Mid
5.250–5.350
100
250
1,000
U-NII-2B
5.350–5.470
120
—
—
U-NII-2C
U-NII Worldwide / U-NII-2-Extended / U-NII-2e
5.470–5.725
255
250
1,000
U-NII-3
U-NII Upper
5.725-5.850
125
1,000
4,000
U-NII-4
DSRC/ITS
5.850–5.925
75
—
—
U-NII-5
5.925–6.425
500
—
—
U-NII-6
6.425–6.525
100
—
—
U-NII-7
6.525–6.875
350
—
—
U-NII-8
6.875–7.125
250
—
—
Wireless ISPs generally use 5.725–5.825 GHz.
In the USA licensed amateur radio operators are authorized 5.650–5.925 GHz by Part 97.303 of the FCC rules.
U-NII power limits are defined by the United States CFR Title 47 (Telecommunication), Part 15 - Radio Frequency Devices, Subpart E - Unlicensed National Information Infrastructure Devices, Paragraph 15.407 - General technical requirements.
Many other countries use similar bands for Wireless communication due to a shared IEEE standard. However, regulatory use in individual countries may differ.
The defunct European HiperLAN standard operates in same frequency band as the U-NII.
^"15.07.2005, Heise: 5 GHz WLAN to be available all over Europe" www.heise.de Archived 2005-08-07 at the Wayback Machine
^""Cisco: Glossary" www.cisco.com".
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