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The Unlicensed National Information Infrastructure (U-NII) radio band is part of the radio frequency spectrum used by IEEE-802.11a devices and by many wireless ISPs. It operates over three ranges:

  • U-NII 1:
    • 5.15-5.25 GHz. Sometimes referred to as U-NII Indoor. Regulations require use of an integrated antenna.
    • 5.25-5.35 GHz. Sometimes referred to as U-NII Low. Regulations allow for a user-installable antenna.
  • U-NII 2: 5.47-5.725 GHz. Both outdoor and indoor use, subject to Dynamic Frequency Selection (DFS, or radar avoidance)[citation needed]
  • U-NII 3: 5.725 to 5.825 GHz. Sometimes referred to as U-NII / ISM due to overlap with the ISM band. Regulations allow for a user-installable antenna.

Wireless ISPs generally use 5.725-5.825 GHz.

U-NII is an FCC regulatory domain for 5- GHz wireless devices. 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. Regulatory use in individual countries may differ.

The European HiperLAN standard operates in the U-NII band.


  • 15.07.2005, Heise: 5 GHz WLAN to be available all over Europe Citat: "...Today, the European Commission resolved in Brussels to regulate two blocks in the 5 GHz range (5150-5350 MHz and 5470-5725 MHz) for all of Europe..."
  • Cisco: Glossary

See also


    This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "U-NII". A list of authors is available in Wikipedia.
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