Broadband and mobile checker

Search a postcode or postcode area against the current live broadband and mobile coverage seams.

Source: Ofcom broadband and mobile coverage. Coverage: Live connectivity rows matched postcode area SL4. Broadband is postcode level and mobile coverage remains area-level only in the current public seam.. Freshness: Broadband year 2024 · Mobile year 2025. Matches: 25.
Postcode Area Broadband Mobile Freshness
SL4 1AA Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1AE Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1AF Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1AG Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1AN Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1AT Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BA Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 18.2%, with 18.2% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BB Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 12.5%, with 12.5% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BE Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BF Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BG Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BH Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BN Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 10.3%, with 10.3% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BP Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BQ Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BY Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1BZ Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1DA Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1DD Windsor and Maidenhead Strong broadband coverage
Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1DE Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 33.3%, with 33.3% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1DG Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 71.4%, with 71.4% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1DH Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 33.3%, with 33.3% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1DL Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1DN Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 14.3%, with 14.3% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025
SL4 1DP Windsor and Maidenhead Broadband coverage is mixed
Gigabit availability is 0%, with 0% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.
 4G 100% · 5G 76.9%
4G strong-coverage share is 100%, with 5G at 76.9% in the current area-level summary.
 Broadband year 2024 · Mobile year 2025

Known caveats

  • Mobile coverage is still served at area level in the public seam, so treat it as a shortlist signal rather than a street-level verdict.
  • Connectivity rows do not replace a final provider and address-level availability check before you commit to a property.
  • If you search a postcode area, neighbouring postcode rows can differ enough that the exact postcode follow-up still matters.