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To find out whether your home internet reaches you over fiber or coax, check your ISP account or installation paperwork first, then inspect the existing equipment and service entry point. If those clues are unclear, ask the provider whether the address is served by fiber all the way to the premises or by cable/HFC over coax. In the United States, the FCC National Broadband Map can show which technologies providers report as available at your address, but it cannot confirm what is active on your account.
What “fiber” and “coax” mean at your home
The important distinction is the connection’s final stretch to your home—not whether the provider uses fiber somewhere in its wider network. A cable network may use fiber for part of its route and still deliver service to the home over coax.
- Fiber to the premises (FTTP/FTTH): Optical fiber reaches the home or business end user. The FCC’s definition excludes “fiber to the curb” from its fiber-to-premises category. FCC fixed technology codes classify this as fiber to the home or business end user.
- Coaxial cable/HFC: Coaxial cable, or a hybrid fiber-coaxial network, serves the premises. The FCC category includes DOCSIS examples. A provider can use fiber upstream while the final connection remains coax.
Names such as “fiber-powered” or “fiber network” may not tell you what reaches the home. In the UK, Ofcom distinguishes full-fibre to the home from part-fibre, copper, and cable networks; its guidance says providers should make that distinction clear. Ofcom’s full-fibre guidance was published September 16, 2024. Elsewhere, ask the local provider what technology reaches the premises.
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Look at the service description in your online account, order confirmation, or installation paperwork. If it uses broad or unclear wording, contact the provider and ask: “Is my address served by fiber all the way to the premises, or by cable/HFC over coax?”
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If your equipment or paperwork points in different directions, ask the provider to identify the access technology and where the fiber or coax handoff is located. Account information and confirmation from the provider are more useful for identifying your active service than a list of technologies available in your area.
Inspect the existing equipment and wiring
Look without unplugging or disconnecting anything. Equipment varies by provider and installation, so use these as clues rather than a definitive test.
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Clues that suggest fiber
- A small fiber wall plate or terminal, sometimes called a Fiber Jack.
- An optical network terminal (ONT), which terminates the fiber connection. Some installations use a separate ONT that connects onward to the router by Ethernet.
Google Fiber calls its small device at the wall plate a Fiber Jack and describes it as the point where its optical signal enters the home. It may be installed somewhere less obvious than the main router location. Google Fiber’s Fiber Jack information describes the device; other providers may use different names and equipment.
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Clues that suggest coax
- A cable modem with a round, threaded coax connector.
- A coax cable running from a wall outlet to the modem, or coax outlets distributed to television locations.
A visible coax outlet is not proof that your internet uses coax: a home may have old or reused wiring, and a fiber installation can coexist with coax used for television or another purpose. Likewise, the router alone may not reveal the access technology. The FCC’s technology definitions distinguish the service delivered to the premises, not every cable present inside a building.
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Use the FCC map to check U.S. availability
In the United States, enter your address in the FCC National Broadband Map and review the providers and technologies listed. The map displays provider-reported availability and advertised speeds. It does not show performance, affordability, adoption, or the technology currently active on your particular subscriber account. The FCC explains these limits in its consumer guide to the map; it also provides a process to challenge inaccurate listings.
Use the map to see what providers say is available at the address, not as final proof of your installed connection. The map and FCC technology codes apply to the United States; they are not a worldwide lookup.
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Resolve conflicting clues without buying equipment
- Check the plan description, account, and installation paperwork for the access technology.
- Inspect the existing wall connection and equipment for a fiber terminal/ONT or a coax feed and cable modem; do not disconnect them.
- For a U.S. address, compare those clues with the technologies listed on the FCC map, remembering that it shows availability rather than your active service.
- If the answer remains unclear, ask the ISP to confirm whether the final connection is FTTP/FTTH or cable/HFC over coax and where the handoff is.
You do not need to buy a modem, ONT, tester, or cable to identify the connection. If you are choosing between available services, compare the technology at the address along with advertised download and upload speeds, fees, and contract terms. The connection type alone does not establish a universal speed or performance advantage for every plan.
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