Ofcom data · 880 postcodes

CF23 broadband coverage — Cardiff

Full-fibre, gigabit and superfast broadband availability across the CF23 postcode district, plus business broadband and leased-line options for Cardiff.

Excellent coverage

Superfast (30Mb+)

98.2%

Ultrafast (300Mb+)

84.5%

Gigabit-capable

82%

Below USO (10Mb)

Check broadband at your exact CF23 postcode

District figures are an average — get the precise availability, full-fibre status and mobile signal for your address.

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Broadband in CF23

Broadband availability in the CF23 postcode district (Cardiff) is Excellent — gigabit-capable full fibre is widely available. Across the 880 postcodes Ofcom measures in CF23, superfast broadband (30 Mbit/s or faster) reaches 98.2% of premises and gigabit-capable lines are available to 82%.

Around 0% of premises in CF23 fall below the Universal Service Obligation (a minimum of 10 Mbit/s download and 1 Mbit/s upload), so the overwhelming majority of homes and businesses here can already order a decent fixed line. For a business that depends on its connection, the figures that matter most are gigabit and full-fibre availability — the symmetric, low-contention services we quote leased lines and FTTP against.

Sample postcodes in CF23

Postcode	Superfast	Gigabit
CF23 5AA	100%	100%
CF23 5AB	100%	100%
CF23 5AD	100%	100%
CF23 5AE	100%	100%
CF23 5AF	100%	100%
CF23 5AG	100%	100%
CF23 5AH	100%	100%
CF23 5AJ	100%	100%
CF23 5AL	100%	100%
CF23 5AN	100%	100%

Business broadband & leased lines in Cardiff

Whether the CF23 district has full fibre yet or not, we can connect your business. Where FTTP and gigabit are live we quote ultrafast full-fibre; where they aren't, a leased line still delivers guaranteed, symmetric speeds with an SLA. We also handle mobile coverage and VoIP for the same site.

Get a business broadband quote for CF23

Free, no obligation — full fibre, leased line or FTTC, matched to what's actually available at your postcode.

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Nearby CF districts

CF14 — 89.3% gigabit CF5 — 87.5% gigabit CF83 — 85.9% gigabit CF24 — 95.2% gigabit CF44 — 65.7% gigabit CF31 — 80.8% gigabit CF3 — 86.7% gigabit CF62 — 92.4% gigabit CF64 — 85.5% gigabit CF37 — 48.4% gigabit

See all Cardiff (CF) broadband coverage ›

Frequently asked questions

What broadband speeds are available in the CF23 area (Cardiff)?

In the CF23 area (Cardiff), superfast broadband (30 Mbit/s+) is available to approximately 98.2% of premises and gigabit-capable broadband to around 82%, based on Ofcom Connected Nations data. Exact availability varies by postcode — enter your full postcode in our checker for a precise result.

Can I get full-fibre or gigabit broadband in the CF23 area (Cardiff)?

Gigabit-capable coverage in the CF23 area (Cardiff) stands at about 82% of premises. Where gigabit and full-fibre (FTTP) are live, businesses can order symmetric, low-latency connections — ideal for cloud, VoIP and multi-site working. If full fibre hasn't reached your premises yet, a leased line can still deliver guaranteed gigabit speeds.

How do I check broadband at my exact address in the CF23 area (Cardiff)?

Use the free broadband postcode checker on this page: enter your postcode to see fixed-broadband availability, gigabit/full-fibre coverage and mobile signal for all four networks at that location, sourced from official Ofcom data.

Who provides business broadband in the CF23 area (Cardiff)?

Most UK providers serve the CF23 area (Cardiff) over the Openreach and (where present) CityFibre or Virgin Media networks. Connection Technologies arranges business broadband, full-fibre (FTTP) and leased lines across the area — request a quote to compare options for your postcode.

Broadband availability data © 2026 Ofcom (Connected Nations), licensed under the Open Government Licence v3.0. Figures are area averages and predictions; availability at an individual address may differ — always confirm with a postcode-level check.