Calls from 01245 823 XXX — Chelmsford
Block 01245 823 XXX is allocated by Ofcom to Twilio Ireland Limited, on the Chelmsford exchange (allocated 2024).
01245 823 XXX is a number block in Chelmsford, in the historic county of Essex, an area with a population of approximately 168,310. Standard landlines in this area use the format 01245 823123, with the first part being the dialling code and the rest being the local number.
This block — 01245 823 XXX — was allocated by Ofcom to Twilio Ireland Limited in 2024. Twilio Ireland Limited either operates the numbers directly or sub-allocates them to resellers and downstream carriers, which is why a single 01245 823 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 HMRC-impersonation scam continues to be the most-reported telephone scam in the UK, and blocks like 01245 823 XXX are sometimes spoofed for these calls. HMRC will never threaten arrest, demand payment by gift card or cryptocurrency, or use a 'press 1 to speak to an officer' menu. If in doubt, hang up and contact HMRC on the number printed on their gov.uk page.
If a 01245 823 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 01245 823 XXX
Is 01245 823 XXX a real UK phone number?
Yes. 01245 823 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 Twilio Ireland Limited for use on the UK public telephone network.
Who owns the 01245 823 XXX number block?
01245 823 XXX is currently allocated to Twilio Ireland 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 01245 823 XXX number based?
01245 823 XXX is associated with Chelmsford. UK geographic numbers historically indicated the location of the line, although VoIP services and number-portability rules mean a 01245 823 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 01245 823 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 01245
Try a different block within the same UK area code:
