Calls from (028) 21529 XXX — Northern Ireland
Block (028) 21529 XXX is allocated by Ofcom to Eircom (UK) Limited, on the Northern Ireland exchange (allocated 2021).
(028) 21529 XXX is a number block in Northern Ireland, an area with a population of approximately 1,880,000. Standard landlines in this area use the format 028 2152 9123, with the first part being the dialling code and the rest being the local number.
This block — (028) 21529 XXX — was allocated by Ofcom to Eircom (UK) Limited in 2021. Eircom (UK) Limited either operates the numbers directly or sub-allocates them to resellers and downstream carriers, which is why a single (028) 21529 XXX prefix can be used by many different organisations. You can verify any allocation against Ofcom's National Telephone Numbering Plan, which is updated weekly.
The most common cold-call pattern reported for UK geographic blocks like (028) 21529 XXX is the 'utility supplier' scam — a caller claiming to represent your energy or broadband provider and asking you to confirm bank-account details to renew or 'protect' an existing tariff. Legitimate UK providers will never ask for full security details on an outbound call.
If a (028) 21529 XXX number called you and you're not sure who it was, the safest steps are: don't return the call until you've verified it (search the full number online first), don't share personal or financial details, and register the number with the Telephone Preference Service (TPS) if it's a marketing call. Persistent unwanted calls can be reported to Ofcom and the ICO. To block a specific number on most UK mobiles and landlines, you can also enable network-level call screening through your provider.
FAQs about (028) 21529 XXX
Is (028) 21529 XXX a real UK phone number?
Yes. (028) 21529 XXX is part of an Ofcom-allocated UK number block — any number starting with that prefix is a real, dialable UK number assigned by Ofcom to Eircom (UK) Limited for use on the UK public telephone network.
Who owns the (028) 21529 XXX number block?
(028) 21529 XXX is currently allocated to Eircom (UK) Limited in Ofcom's National Telephone Numbering Plan. The allocated carrier may operate the numbers directly or sub-allocate them to downstream resellers — both arrangements are normal under UK telecoms rules.
Where is a (028) 21529 XXX number based?
(028) 21529 XXX is associated with Northern Ireland. UK geographic numbers historically indicated the location of the line, although VoIP services and number-portability rules mean a (028) 21529 XXX number can technically be used anywhere a CP routes it. For most UK landlines the geographic match still holds.
How do I block calls from (028) 21529 XXX?
On most UK smartphones, open the recent-calls list, tap the number, and choose 'Block this caller'. UK landlines from BT, Sky, TalkTalk and Virgin Media include free 'BT Call Protect'-style screening you can enable in your provider's app. You can also register your number with the Telephone Preference Service (TPS) at tpsonline.org.uk to opt out of legitimate UK marketing calls.
Other blocks in (028)
Try a different block within the same UK area code:
