Fiber lit buildings
Find fiber lit buildings at any U.S. commercial address
CarrierFinder shows which carriers are on-net or near-net at any U.S. commercial address, from a database of 5.4M fiber lit buildings, 3.2M fiber route miles and 115M serviceable locations.
5.4M
Fiber lit buildings
3.2M
Fiber route miles
115M
Serviceable locations
The basics
What is a fiber lit building?
A fiber lit building is a commercial site where a carrier has already brought fiber into the building. Because the fiber is already in place, the carrier can usually deliver service without a long and expensive off-net build. That matters to anyone buying or selling connectivity: a lit building usually means shorter install intervals, more predictable pricing and fewer surprises during construction.
Lit-building lists are scattered across carrier websites, spreadsheets and sales decks, and each one only shows a single network. CarrierFinder brings that data together. You type in one address and see every carrier that's on-net or near-net, so you're not stuck with one provider's marketing map.
On-net
Fiber is already in the building
The carrier has an active connection on site and can usually serve the building quickly.
Near-net
Fiber is close by
A short lateral extension may connect the building to an existing route.
Off-net
Fiber is farther away
Service may require a longer build, more time and higher construction cost.
Search
Search 5.4M fiber lit buildings by address
Enter a U.S. commercial address to see which carriers can serve it. CarrierFinder checks the location against a database of 5.4M fiber lit buildings, 3.2M fiber route miles and 115M serviceable locations, then shows you the carriers that are on-net or near-net. MSPs, consultants and sales teams use it to qualify opportunities faster and stop guessing about coverage.
How a fiber lit building search works
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Enter a commercial address. Start with the building you're quoting, a client's branch office or a prospect's headquarters.
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See on-net and near-net carriers. CarrierFinder lists the carriers with fiber in or near the building.
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Check route context. Open fiber maps to see nearby carrier routes and judge how short a near-net extension might be.
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Request pricing. Turn a qualified location into a quote conversation with the right carriers.
Serviceability
On-net vs near-net: why the difference matters
On-net locations are already connected to a carrier network, so they are usually the fastest and simplest to serve. Near-net locations sit close to existing fiber and may be serviceable with a short extension. Knowing which is which before you call a carrier helps you set realistic expectations with clients on timing and cost.
Seeing several carriers at once also shows where you have options. A building that's on-net for one carrier and near-net for two others gives your client room to compare price, diversity and redundancy.
Who it's for
Built for MSPs, consultants and connectivity teams
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Qualify serviceability before recommending a solution.
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Compare carrier options across multiple commercial locations.
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Build a clearer shortlist of carriers for each client site.
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Move from address research to a confident client conversation faster.
Whether you're a telecom agent, a technology consultant, an MSP or an enterprise IT team, the work starts with the same question: who can actually serve this building? CarrierFinder answers it in seconds, so you can spend your time on design, pricing and the client relationship.
Fiber lit buildings + fiber maps
Pair building-level availability with fiber route context to spot laterals and redundancy.
See the full platform
Seats, widgets, API access and batch tools for teams that qualify many sites.
Request pricing
Need help turning a qualified location into a quote? Start with a free search.
Carriers: put your lit buildings on the map
Providers can upload fiber lit buildings and KML routes to CarrierFinder at no cost. That makes your network easier for MSPs, consultants and enterprise buyers to discover when they're qualifying sites.
Learn more on the CarrierFinder homepage.
Frequently asked questions
What is a fiber lit building?
A fiber lit building is a commercial site where a carrier has already brought fiber into the building and can typically deliver service without a long off-net build. CarrierFinder tracks 5.4M of them across the U.S.
What is the difference between on-net and near-net?
On-net locations are already connected to a carrier's network. Near-net locations are close to existing fiber and may be serviceable with a short extension. Off-net locations are farther away and may need a longer build.
How is CarrierFinder different from the FCC National Broadband Map?
The FCC map is useful for broad availability reporting. CarrierFinder focuses on commercial fiber availability and building-level data, so you can see which carriers are on-net or near-net at a specific commercial address.
Do I need a paid plan to search fiber lit buildings?
No. You can sign up for free to search fiber availability. Professional plans add seats, widgets, API access, and batch tools.
Can carriers contribute their building data?
Yes. Providers can upload fiber lit buildings and KML routes at no cost, which makes their network easier for qualified buyers and partners to find.