Key takeaways
- Tenants want at least two carriers and two physically separate fiber routes into the site. One route is a red flag.
- Distance to existing fiber drives the cost. Builds ran a median $18 a foot underground and $8 aerial in 2025, about $95,000 and $42,000 a mile by our math.
- Permits, easements and pole work set the schedule, not digging. A custom build can take up to two years.
- Carriers often fund the lateral in exchange for a term commitment. Get competing feasibility answers before you option land or sign anything.
Why fiber is the second gate after power
Site selection for large data centers now starts with power. Fiber is the next filter, and it is the one owners check too late. A parcel can clear on acreage, power and incentives and still fail on route diversity after the option payment is made (Global Data Center Hub).
The reason is simple. A data center is only as useful as its connections. An AI training campus moves data between clouds and other campuses. An inference or enterprise site needs low-latency paths to users. Neither works on one strand of fiber from one provider. If you already know your power story, read what makes land "powered". This page covers the fiber half.
Check fiber carriers at an address
Enter a street address, or coordinates for land without one. The checker answers two questions from FCC data. First, who sells fiber in this census tract and county today, from providers' December 31, 2025 filings. Second, which carriers filed fiber in the block, tract and county in 2021, when the FCC still counted business-only service. That second list is where enterprise carriers that build laterals and sell dark fiber show up.
Enter an address, or latitude and longitude for land without one, then press "Check fiber carriers".
Sources: FCC Broadband Data Collection, fixed broadband availability, Fiber to the Premises, as of December 31, 2025, summarized by census tract and county; and FCC Form 477 fixed deployment data, June 30, 2021. Both are free to use and not subject to copyright (FCC). The current data covers mass-market service only, so carriers that sell only dedicated enterprise circuits do not appear in it. A filing is not fiber at your parcel, a route, spare capacity or a price. For a single address, see the FCC National Broadband Map. Your browser sends the coordinates to the FCC Area API and the census codes to the FCC data portal. An address goes to the US Census geocoder through our server. Nothing is stored.
How to read the results
- Providers in "today" with many business locations already sell fiber to companies near you. They are often the fastest route to a lateral in rural counties.
- A business-only carrier in the 2021 list is the strongest enterprise lead. It means an enterprise network already runs nearby, and the question becomes how far its route is from your land.
- Nothing in your block is normal for rural land. Look at the tract and county rings. A carrier that serves the county seat can often extend a lateral.
- Only residential providers (cable, a local telephone company, a co-op) means last-mile fiber, not a long-haul route. Those networks can still carry a lateral, but ask about capacity and route diversity early.
- Long-haul routes do not show up here. Carriers do not file the backbone that passes your land, only places they sell service. Ask carriers for their nearest splice point or handhole.
What tenants expect from fiber
Requirements vary by tenant, but the same questions come up in every review.
| Question | What buyers look for | Why |
|---|---|---|
| How many carriers? | Two or more with network at the site or within trenching distance | Price competition and no single point of failure (Global Data Center Hub) |
| How many routes? | Two physically separate paths into the building, from different directions | Cabling standards call for diverse routes in separate pathways that do not share conduits or crossings (TRG Datacenters, on TIA-569-E) |
| How far to fiber? | Within about 5 miles of high-capacity dark fiber. Sites 3 to 10 miles out need a cost and schedule study | Each mile adds cost, permits and time (Global Data Center Hub) |
| How much fiber? | High strand counts. Hyperscalers are reported to buy 24 to 48 fiber pairs per route | AI campuses move data between sites at very high volume (Global Data Center Hub) |
| Where does it go? | Diverse paths to the nearest carrier hotels, cloud on-ramps and other campuses | Colocation-grade sites sit within a couple of miles of dark fiber and carrier points of presence (Dr. Peering) |
"Diverse" has to mean separate all the way back. In AT&T's diversity filing, two routes are diverse only from the closest available point of divergence, need two separate ports, and terminate in different wire centers (AT&T, GBEX-20-0002). If both routes cross the same bridge or share one trench out of your driveway, a tenant will count them as one.
Three ways fiber reaches a site
- Fiber is already on or next to the site. A carrier vault, handhole or route runs along your frontage. This is the cheapest and fastest case. Ask for a splice and a short entrance build.
- A carrier builds a lateral. A lateral is a spur from the carrier's existing route to your building. Most powered land falls here. Cost and time depend on distance, terrain, crossings and whether the cable goes on poles or underground.
- A new route is built to the region. Rare, and usually tied to a large campus or an anchor tenant. Carriers are building new long-haul routes toward emerging data center corridors, but they plan them around demand, not a single parcel.
What a fiber lateral costs
The best public benchmark is the annual cost survey of US fiber builders by the Fiber Broadband Association and Cartesian. In 2025, median construction cost was $18.00 a foot underground and $8.00 a foot aerial (FBA and Cartesian, 2025 Fiber Deployment Cost Annual Report). At 5,280 feet a mile that is about $95,000 a mile underground and $42,000 aerial. The per-mile figures are our arithmetic.
The same survey explains what moves the number:
- Labor. It is 72% of underground cost and 64% of aerial cost. Underground costs rose 3% and aerial 14% from the prior year.
- Method. Trenching cost 60% more than plowing and 6% more than directional boring. Burying cable directly, without conduit, was about 40% cheaper but less flexible later.
- Make-ready. Preparing utility poles for new cable sometimes approached or exceeded the original construction budget, forcing redesigns or a switch to underground.
Treat these as a floor for a data center lateral. They are broadband builds. A data center route usually carries far more fiber, needs two separate paths, and may cross rail lines, rivers or highways that each need their own agreement. One vendor estimate puts about five miles of new lateral at millions of dollars (Landgate).
Lateral cost screen
Enter route miles to the nearest carrier fiber, measured along roads or rights of way rather than a straight line. Add a second, separate route if you are planning for diversity.
One route. A tenant will usually ask for a second, separate route. Construction only, at the 2025 median of $8 a foot aerial and $18 a foot underground. Excludes make-ready, crossings, permits, easements, equipment and carrier margin.
A screen, not a quote. Carriers price the same lateral very differently, and many will fund it for a term commitment.
How long it takes
- Existing fiber: days to a few months. Dark fiber providers with pre-built spans quote lead times in days (Lightpath). Salt River Project lists a standard 90-day interval for its dark fiber, longer when permits and construction are involved (SRP).
- A custom build: up to two years, driven by permitting, ground conditions and equipment lead times (Lightpath).
- Supply chain: fiber and equipment lead times reportedly reached 60 weeks during the 2022 to 2023 crunch (Global Data Center Hub). Ask every carrier for current lead times in writing.
Work backward from the date power is on. If power arrives in 30 months and the fiber build takes 24, the fiber conversation should start now, alongside the utility study.
Who pays for the build
There are three common models.
- The carrier builds and recovers it in the contract. The carrier funds the lateral and you or your tenant sign a multi-year commitment. Carriers build sooner when a site commits minimum spend or bandwidth and coordinates permitting windows (Data Center Knowledge).
- Special construction charges. The carrier quotes a one-time build fee on top of monthly service. Common when the distance is long and the expected revenue is small.
- The developer builds and owns the conduit. You pay to place conduit, then lease it or pull fiber with one or more carriers. More capital up front, more control and leverage later.
The leverage comes from competition. Two carriers bidding on the same lateral often produces a better answer than one. That is the work we do, and it costs you nothing. Get real quotes for your site.
Who is building long-haul and metro fiber now
Carriers are adding routes toward new data center regions. A few recent examples, from the carriers' own announcements and trade coverage:
- Zayo completed its 622-mile Umatilla to Prineville to Reno route in late 2025, a western path separate from the I-5 corridor, partly funded by the NTIA Middle Mile Grant Program. It plans another 5,000 route miles of long-haul fiber by 2030 (Inside Towers, November 2025). In 2021 it finished Atlanta to Dallas (822 miles) and Denver to Salt Lake City (532 miles) (Zayo, September 2021).
- Zayo and Crown Castle. Zayo closed its purchase of Crown Castle's fiber business on May 1, 2026 (Fierce Network), adding about 90,000 metro route miles (Converge Digest). Fiber the FCC data lists under Crown Castle is now Zayo's.
- Lumen announced NorthLine on May 12, 2026, a new route from Seattle to Minneapolis of about 2,000 route miles, expected to be available by the end of 2026 (Lumen; Inside Towers). Lumen says the route runs alongside emerging data center corridors in the northern US (Fierce Network). Lumen sold its consumer fiber business to AT&T on February 2, 2026 and kept its enterprise network (DCD).
- Uniti completed its merger with Windstream on August 1, 2025, combining two large wholesale and regional fiber networks (Fiber Broadband Association).
Regional and utility-owned networks matter too, especially in rural areas. Electric co-ops, state middle-mile programs and regional carriers often own the fiber closest to powered land. The checker above surfaces them when they filed with the FCC. Carrier network maps: Zayo, Lumen, Cogent. Naming a carrier is not a claim that it serves or will build to any site.
Dark fiber, wavelengths or lit service
| Option | What you get | Best for |
|---|---|---|
| Dark fiber (lease or IRU) | Unlit strands you light with your own equipment, often on a 10 to 20 year lease or right of use | Large campuses and tenants who want control and unlimited capacity |
| Wavelengths | A dedicated optical channel, commonly 100G or 400G, lit and run by the carrier | High capacity between sites without owning optics |
| Lit Ethernet or internet | Managed bandwidth at a set speed | Smaller loads, operations and early phases |
The fiber section of your data room
Put these next to your power documents. They mirror the powered land data room.
- A route map with each carrier's nearest access point and the distance along roads or rights of way.
- Feasibility or budgetary letters from at least two carriers, with build time and who pays.
- Proof that the two routes are physically separate, including where they diverge.
- Easements, road and railroad crossing permits, and pole attachment status, or a plan to get them.
- Strand counts, conduit sizes and spare conduit on each route.
- Building entrance plan with two separate entry points.
Red flags
- Only one carrier is interested, or only one route exists.
- Both routes share a bridge, culvert, rail crossing or the same trench near the site.
- A carrier letter states interest but no build time, cost or capacity.
- The "fiber" is consumer broadband to nearby homes, with no enterprise network in the area.
- No one has asked who owns the land the lateral must cross.
Get real carrier quotes for your site
A filing tells you who is nearby. Only a carrier quote tells you what it will cost and when. We take your site to the carriers that can serve it and come back with real answers.
- You send the site. An address or coordinates, power status and what you need. Checker results attach automatically.
- We go to the carriers. Enterprise and regional carriers that can reach the site get the same request for feasibility, routes, build time and price.
- You compare. The answers come back side by side, including who funds the build and what term each carrier wants.
We are part of Bridgepointe Technologies.
- No cost to landowners or tenants. Carriers pay us if you buy service, and we disclose that on every comparison.
- We do not ask for an exclusive. We do not design or build networks.
- We read fiber the way a tenant's network team will, next to your power documents.
Get real carrier quotes for your site
Send what you know. An advisor replies within one business day. Free to you.
Frequently asked questions
How do I find out if there is fiber near my land?
Start with the checker on this page, which lists carriers that filed fiber with the FCC in your census block, tract and county. Then ask those carriers for their nearest access point and a feasibility answer. Long-haul routes that pass your land without serving it will not appear in FCC filings, so carrier conversations are the only reliable way to find them.
How much does it cost to run fiber to a property?
The 2025 median construction cost was $18 a foot underground and $8 a foot aerial, about $95,000 and $42,000 a mile. A data center lateral usually costs more because it needs more fiber, two separate routes and crossing permits. Carriers often fund the build in exchange for a term commitment.
How close to fiber does a data center site need to be?
A common rule of thumb is within about 5 miles of high-capacity dark fiber. Sites 3 to 10 miles away can work but need a cost and schedule study. Distance matters less than having two carriers and two separate routes.
What is a fiber lateral?
A lateral is a spur that connects a building to a carrier's existing fiber route. The carrier splices into its route at the nearest access point and builds new cable to your site, on poles or underground.
How long does it take to bring fiber to a new site?
Days to a few months where fiber already exists. Up to two years for a custom build, mostly because of permits, easements and pole work.
Does the FCC data show every fiber route?
No. The current FCC data shows where providers sell fiber to homes and small businesses. The 2021 filing also counted business-only service, but ownership has changed since. Neither shows backbone routes that pass through without serving anyone. Use the checker to build a call list, not to prove fiber exists at a parcel.
Do you build fiber or sell land?
No. We compare carriers for landowners, developers and tenants and connect powered sites with operators. A conversation with us is not an engineering study or legal advice.
Sources
- Federal Communications Commission, Broadband Data Collection availability data, December 31, 2025 (source data: FCC Broadband Data Collection); Fixed Broadband Deployment Data, June 2021 (Form 477); FCC Area API; National Broadband Map, About and license.
- Fiber Broadband Association and Cartesian, 2025 Fiber Deployment Cost Annual Report, survey of US operators and contractors, September to October 2025.
- Global Data Center Hub, How to Evaluate Dark Fiber Availability Before Acquiring Data Center Land and Fiber Is the Second Queue.
- Lightpath, Your AI Campus Has a Power Date. It Needs a Network Date.
- Salt River Project, telecommunications services.
- AT&T, diversity service filing GBEX-20-0002.
- TRG Datacenters, The Importance of Diverse Fiber Routes in Data Centers, summarizing TIA-569-E.
- Dr. Peering, Taxonomy of Data Centers.
- Data Center Knowledge, Could Fiber Be the Next Big Bottleneck in Data Center Growth?
- Landgate, Unlocking the Potential of Data Centers and Fiber Optics.
- Zayo, Zayo Completes New Long Haul Dark Fiber Routes, September 30, 2021; Inside Towers, Zayo Builds Long-Haul Fiber Backbone for Western U.S. AI Growth, November 2025.
- Fierce Network, Zayo closes $4.25B Crown Castle fiber deal; Converge Digest, Zayo adds 90,000 metro fiber route miles.
- Lumen, Lumen Expands its U.S. Network with NorthLine, May 12, 2026; Inside Towers, Lumen Launches NorthLine; Fierce Network, Lumen builds new long-haul route.
- DCD, AT&T completes $5.75bn acquisition of Lumen's mass market fiber business.
- Fiber Broadband Association, Uniti Completes Merger with Windstream, August 1, 2025.
Per-mile costs and the lateral screen are our arithmetic from the published per-foot medians. Nothing on this page is an engineering study, a carrier quote or legal advice.