How much Upper C-band spectrum will the FCC auction?

The FCC approved an auction of 160 megahertz from 3.98 to 4.14 GHz in the contiguous United States. The spectrum will be divided into eight unpaired 20-megahertz blocks.

When will the Upper C-band auction happen?

Federal law requires the competitive bidding process to be completed by July 4, 2027. The FCC still must establish the final auction procedures before bidding begins.

When can wireless providers start using the new spectrum?

Wireless operations may begin after the relevant satellite transition deadline. Service can start in the top 75 Partial Economic Areas on December 31, 2030, and in the remaining covered markets on July 1, 2031.

Will the auction improve home internet immediately?

No. The order creates the licensing and transition framework, but it does not immediately add coverage or speed. Any consumer benefit will depend on which companies win licenses, where they deploy the spectrum and how they use it.

FCC Opens 160 MHz of Upper C-Band for Wireless Auction

Q: Does the Upper C-band plan apply to Alaska, Hawaii and U.S. territories?

No. The auctioned Upper C-band licenses cover the contiguous 48 states and the District of Columbia. The FCC preserved the existing allocation and use outside the contiguous United States.

THE FCC APPROVED THE RULES, NOT THE AUCTION RESULT

The Federal Communications Commission adopted a plan on July 23, 2026, to auction 160 megahertz of Upper C-band spectrum for terrestrial wireless use. The spectrum runs from 3.98 GHz to 4.14 GHz and will be licensed across the contiguous United States.

The decision is an important step toward another large mid-band spectrum auction, but it is not the auction itself. No carrier has won the spectrum, no final prices have been set and no customer will see an immediate change in mobile or home internet service. The FCC must still adopt the detailed auction procedures, accept applications and complete competitive bidding by the federal deadline.

The Commission says the auction will include 3,248 flexible-use licenses. These licenses can support mobile networks, fixed wireless access and other permitted terrestrial services. The plan builds on the Lower C-band auction completed in 2020, which helped U.S. carriers expand mid-band 5G coverage.

THE ONE-SENTENCE VERSION

The FCC has created the rules for auctioning another 160 MHz of C-band spectrum, but providers generally cannot turn it on until satellite operations relocate and aviation safeguards are in place at the end of 2030 and in 2031.

THE UPPER C-BAND PLAN AT A GLANCE

ITEM	FCC DECISION	WHY IT MATTERS
Spectrum for auction	160 MHz at 3.98–4.14 GHz	Adds a large block of mid-band capacity for terrestrial wireless networks
License structure	Eight unpaired 20 MHz blocks	Matches the Lower C-band block size and supports flexible spectrum combinations
Total licenses	3,248	Licenses are divided by spectrum block and Partial Economic Area
Auction deadline	By July 4, 2027	Congress required the FCC to finish competitive bidding within two years
First service date	December 31, 2030	Applies to the top 75 covered markets after the primary satellite transition deadline
Remaining markets	July 1, 2031	Follows the final transition deadline for the rest of the contiguous United States

THE PLAN CREATES A 440 MHZ CONTIGUOUS WIRELESS BLOCK

The C-band sits in a useful middle position between low-band and high-band spectrum. It generally offers more capacity than lower frequencies while covering a wider area than millimeter-wave spectrum. That balance has made C-band an important part of U.S. 5G deployment.

The Lower C-band already provides terrestrial wireless service from 3.7 GHz to 3.98 GHz. Adding the newly approved Upper C-band range from 3.98 GHz to 4.14 GHz will create a single 440 MHz block running from 3.7 GHz to 4.14 GHz.

The Upper C-band portion will be divided into eight unpaired blocks of 20 MHz each. The FCC chose the same block size used in the Lower C-band. A common structure can make it easier for licensees to combine holdings and for equipment manufacturers to support a broader, harmonized band.

The licenses will use Partial Economic Areas, or PEAs, rather than one nationwide license. A provider may therefore win different amounts of spectrum in different markets. The FCC is not imposing a pre-auction cap on how much Upper C-band spectrum one company may acquire, but it will review spectrum holdings when winning bidders file their long-form license applications.

WHAT HAPPENS TO THE REST OF THE UPPER C-BAND?

The entire Upper C-band extends to 4.2 GHz, but the FCC is not assigning all of it to terrestrial wireless service. The new arrangement includes:

3.98–4.14 GHz: 160 MHz for licensed terrestrial wireless use.
4.14–4.16 GHz: a 20 MHz guard band.
4.16–4.20 GHz: 40 MHz retained for relocated Fixed Satellite Service operations.

The guard band separates full-power wireless operations from the satellite services that will remain above 4.16 GHz. There will also be 60 MHz between the top of the new wireless band at 4.14 GHz and the start of the aviation radio-altimeter band at 4.2 GHz.

GEOGRAPHIC LIMIT

The auctioned licenses cover the contiguous 48 states and the District of Columbia. The FCC preserved the existing spectrum arrangements for Alaska, Hawaii, Puerto Rico and other U.S. territories.

THE AUCTION COMES FIRST; COMMERCIAL USE COMES YEARS LATER

Federal law requires the FCC to complete competitive bidding for at least 100 MHz of the Upper C-band by July 4, 2027. The Commission chose to auction 160 MHz, which is 60 percent more than the minimum set by Congress.

Winning an auction license will not give a provider immediate access to the spectrum. Satellite companies currently use parts of the band to distribute video and other communications services. Those operations must be moved out of 4.0–4.16 GHz or transferred to other delivery methods before full-power terrestrial networks can begin.

The FCC established two transition stages:

Primary transition: satellite operations in the top 75 PEAs must clear by December 30, 2030. Terrestrial wireless service may begin in those markets on December 31, 2030.
Final transition: satellite operations in the remaining covered PEAs must clear by June 30, 2031. Wireless service may begin there on July 1, 2031.

Winning licensees will be responsible for their shares of reasonable satellite relocation expenses, clearinghouse costs and other approved transition payments. The framework also includes accelerated relocation incentives intended to keep the process on schedule.

AVIATION SAFETY IS PART OF THE TIMELINE

Aircraft radio altimeters operate from 4.2 GHz to 4.4 GHz, immediately above the C-band. These instruments help aircraft measure height above the ground during critical phases of flight. Concerns about coexistence between 5G networks and older altimeters affected the rollout of the Lower C-band earlier in the decade.

The FCC says it coordinated the new plan with the Federal Aviation Administration. The Upper C-band schedule is tied to expected FAA requirements for stronger radio-altimeter performance and signal rejection. The FCC framework also provides rebates for defined classes of eligible aircraft owners and operators that purchase and install upgraded altimeters.

The plan does not claim that spectrum alone eliminates every interference issue. Instead, it combines frequency separation, wireless technical rules, deployment timing and aviation-equipment upgrades.

WHAT THE DECISION COULD MEAN FOR MOBILE AND HOME INTERNET

More mid-band spectrum can give wireless providers additional network capacity. Depending on how the licenses are deployed, that capacity could support faster mobile service, reduce congestion in busy areas and provide more room for fixed wireless home internet.

Fixed wireless access uses a cellular network to connect a home or business through a gateway rather than a cable or fiber line. Major carriers already use mid-band spectrum for these services. Additional C-band holdings could help a winning carrier serve more customers or offer more consistent performance where its network is capacity-constrained.

Those benefits are possible, not automatic. The order does not require every license to be used for home internet, and it does not guarantee that every community will receive a new provider. Results will depend on:

which companies win each market and spectrum block;
how much spectrum each winner combines with its existing holdings;
where carriers add radios, towers and backhaul capacity;
whether a provider prioritizes mobile service, fixed wireless or another permitted use; and
how quickly equipment supporting the expanded band reaches commercial networks.

Consumers should therefore treat the July 2026 action as a long-term capacity decision, not an announcement of a new plan they can order now. The first broadly permitted Upper C-band deployments remain more than four years away.

LICENSE WINNERS WILL HAVE BUILDOUT REQUIREMENTS

The FCC requires Upper C-band licensees to provide reliable coverage and offer service to at least 45 percent of the population in each license area within one year of the relevant transition deadline. They must reach at least 80 percent within five years of that deadline.

A license can automatically terminate in an area if the holder misses the applicable performance benchmark. These requirements are intended to prevent companies from winning spectrum and leaving it unused indefinitely.

WHAT TO WATCH NEXT

The next major document will set the detailed auction procedures, including application dates, bidding rules and payment requirements. After that, the important milestones will be the bidder list, auction results, license grants, satellite transition plans and carrier deployment announcements.

THIS IS A CAPACITY PLAN, NOT A NEW INTERNET OFFER

The FCC decision may shape mobile and fixed wireless networks later in the decade. It does not change today’s coverage maps, prices or available plans.

UPPER C-BAND AUCTION QUESTIONS

HOW MUCH SPECTRUM WILL THE FCC AUCTION?

The FCC approved 160 MHz from 3.98 GHz to 4.14 GHz. It will be divided into eight unpaired 20 MHz blocks and offered as 3,248 flexible-use licenses across Partial Economic Areas in the contiguous United States.

WHEN WILL THE UPPER C-BAND AUCTION TAKE PLACE?

Federal law requires the FCC to complete competitive bidding by July 4, 2027. Before bidding begins, the Commission must issue and finalize the detailed auction procedures.

WHEN CAN CARRIERS START USING THE SPECTRUM?

Service may begin in the top 75 covered markets on December 31, 2030. The remaining covered markets become available on July 1, 2031, assuming the required satellite transition work is complete.

WILL THIS MAKE 5G HOME INTERNET FASTER?

It could add capacity for carriers that win licenses and deploy the spectrum for fixed wireless access. It does not guarantee a faster plan at any particular address, and consumer service using the spectrum is years away.

WHY MUST SATELLITE OPERATIONS MOVE?

Fixed Satellite Service operators currently use part of the spectrum that the FCC is repurposing. Their services must be moved into the remaining 4.16–4.20 GHz band or transferred to other technologies before full-power terrestrial wireless networks can use 3.98–4.14 GHz.

DOES THE PLAN COVER ALASKA, HAWAII OR U.S. TERRITORIES?

No. The new Upper C-band licenses cover the contiguous 48 states and the District of Columbia. Existing allocations and operations remain in place outside that area.

SOURCES AND REPORTING NOTES

FCC: C-band auction plan announcement, July 23, 2026

FCC: Upper C-band Report and Order and supporting rule text

FCC: Statement of Chairman Brendan Carr

FCC: Statement of Commissioner Anna M. Gomez

FCC: Statement of Commissioner Olivia Trusty

Method: The spectrum range, block structure, license count, geographic scope, auction deadline, transition schedule, coverage requirements and aviation safeguards were checked against the FCC announcement and adopted rule text. This report distinguishes between approval of the auction framework, completion of the auction and the later start of commercial wireless operations.