Broadband availability
Broadband in Cathays
Showing results for postcode CF10 1AG.
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Broadband Types Available in Cathays
| Type | Status | Download | Upload |
|---|---|---|---|
| Standard Broadband | Not available | — | — |
| Superfast Broadband | Available | 36 Mbps | 20 Mbps |
| Ultrafast / Full Fibre | Available | 900 Mbps | 900 Mbps |
| Mobile Broadband | Available | N/A | N/A |
Best option in Cathays
Full fibre (FTTP) is available in Cathays, with typical download speeds of around 894 Mbps. This is the fastest and most reliable type of home broadband connection.
Broadband Providers in Cathays
Customer ratings sourced from Trustpilot. Checked 18 June 2026.
Postcodes in Cathays
Nearby Areas
About Broadband in Cathays
Cathays is in Caerphilly. Full fibre broadband is available here, with typical download speeds of around 894 Mbps, well above the UK average of 69 Mbps. Most major providers cover the area, so there is a reasonable amount of competition on price.
Standard broadband runs over the copper phone network. Speeds depend on your distance from the telephone exchange and typically range from around 5 Mbps to 20 Mbps.
Superfast broadband (FTTC) uses a fibre optic cable to your street cabinet, then copper for the final stretch to your home. Most urban and suburban areas can get speeds of 35 to 80 Mbps.
Full fibre (FTTP) runs fibre optic cable all the way into your home. It is the fastest and most reliable option available, with speeds from 100 Mbps upwards.
What's Happening with Broadband in Cathays?
Cathays sits within Cardiff, and residents here are well served by Openreach's full fibre (FTTP) network, which delivers typical download speeds of around 894 Mbps. Wales as a whole has become one of the best-connected nations in the UK: Openreach has passed more than 1.25 million Welsh premises with full fibre, pushing FTTP availability in Wales above 81%. That puts Wales ahead of the UK national average of around 82% gigabit-capable coverage recorded in Spring 2026, and Cardiff's urban density means Cathays benefits in particular from that rollout.
Take-up is also strong. Roughly 50% of Welsh homes on full fibre networks have already upgraded, compared with a UK average of around 38%. That means faster speeds and less congestion on the local network for those who have made the switch.
No Cathays-specific or Caerphilly-district fixed-line rollout announcements were identified at the time of writing. We found no published news from Openreach or alternative network operators confirming new build phases specific to this postcode area.
On the altnet side, Ogi operates a full fibre network across parts of South and West Wales, while TfW Fibre (Transport for Wales Fibre) is building in Cardiff and the Valleys. Availability varies by street, so it is worth checking both providers directly alongside Openreach-based options.
One change affecting all Cathays households is the PSTN copper switch-off in January 2027. Openreach is retiring the old analogue phone network, and anyone still using a copper landline for calls or broadband will need to migrate to a digital service before then. If you have a monitored alarm, healthcare device, or older phone, act sooner rather than later.
Use the postcode checker above to see which full fibre and gigabit providers are available at your exact address in Cathays right now.