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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 CM21. 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
CM21 0AA	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AB	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AD	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AE	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AF	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AH	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AJ	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AL	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AN	East Hertfordshire	Strong broadband coverage Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AP	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AQ	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AR	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AS	East Hertfordshire	Broadband coverage is mixed Gigabit availability is 7.1%, with 7.1% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AT	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AU	East Hertfordshire	Strong broadband coverage Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AX	East Hertfordshire	Strong broadband coverage Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AY	East Hertfordshire	Strong broadband coverage Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0AZ	East Hertfordshire	Strong broadband coverage Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0BB	East Hertfordshire	Broadband coverage is mixed Gigabit availability is 9.1%, with 18.2% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0BD	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0BE	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0BJ	East Hertfordshire	Strong broadband coverage Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0BL	East Hertfordshire	Strong broadband coverage Gigabit availability is 100%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0BN	East Hertfordshire	Strong broadband coverage Gigabit availability is 93.8%, with 100% of premises at at least 300 Mbps and 0% below the Universal Service Obligation.	4G 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% in the current area-level summary.	Broadband year 2024 · Mobile year 2025
CM21 0BP	East Hertfordshire	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 98.5% · 5G 15.8% 4G strong-coverage share is 98.5%, with 5G at 15.8% 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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