BT20 postcode
Broadband in BT20 4DX
Castle, Ards and North Down
Broadband data not yet available for this postcode.
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Flood Risk
Medium
Fibre (FTTP)
TBC
Best speed
TBC
Speed Calculator
Adjust the options below to see how much broadband speed your household needs.
HD uses ~5 Mbps per person. 4K uses ~25 Mbps.
Each person on calls needs around 10 Mbps.
Competitive gaming needs low latency as much as raw speed.
Cameras, thermostats, speakers and similar devices each use a few Mbps.
Your household needs approximately 14 Mbps. We don't have speed data for BT20 4DX yet.
Speed Test
Check your current download speed and see how it compares to what is available at BT20 4DX.
The test downloads a 2 MB file from our server and measures how long it takes.
This test measures download speed only. Results vary depending on network conditions.
Mobile coverage
4G & 5G coverage · Ofcom Connected Nations 2025
4G Outdoor
4G Indoor
5G Outdoor
Networks with 4G
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Map
Schools nearby
Nearest schools within 5 miles · Ofsted ratings as at Jan 2026
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🟠
Flood risk: Medium
This postcode is in undefined — medium risk of flooding from rivers and sea.
Flood Zone
Risk Level
Medium
Council tax bands
Band distribution for Ards and North Down
Most common: Band
Annual council tax estimates for , 2024/25
Transport links
Nearest train stations and towns
Air quality
Particulate matter & nitrogen dioxide levels
air quality
Air quality data not available.
WHO guideline: 15 μg/m³
WHO guideline: 45 μg/m³
WHO guideline: 25 μg/m³
Area info
Parish
Castle
District
Ards and North Down
Region
Constituency
LSOA
N21000824
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