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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 CM4. 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
CM4 0AA	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AB	Brentwood	Broadband coverage is mixed Gigabit availability is 59.3%, with 59.3% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AD	Brentwood	Strong broadband coverage Gigabit availability is 89.2%, with 89.2% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AE	Brentwood	Strong broadband coverage Gigabit availability is 95.2%, with 95.2% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AF	Brentwood	Strong broadband coverage Gigabit availability is 88.5%, with 88.5% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AG	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AH	Brentwood	Strong broadband coverage Gigabit availability is 87.8%, with 87.8% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AJ	Brentwood	Broadband coverage is mixed Gigabit availability is 37.2%, with 37.2% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AL	Brentwood	Broadband coverage is mixed Gigabit availability is 3.2%, with 3.2% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AN	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AP	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AQ	Brentwood	Strong broadband coverage Gigabit availability is 97.1%, with 97.1% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AR	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AT	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0AU	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BA	Brentwood	Broadband coverage is mixed Gigabit availability is 35.3%, with 35.3% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BB	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BD	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BE	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BG	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BH	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BL	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BN	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BP	Brentwood	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 39% 4G strong-coverage share is 100%, with 5G at 39% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM4 0BQ	Brentwood	Strong broadband coverage Gigabit availability is 91.7%, with 91.7% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 100% · 5G 39% 4G strong-coverage share is 100%, with 5G at 39% 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.

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