Geographic numbers

Area codes starting 01423

Ofcom’s numbering data lists 505 number ranges starting 01423, allocated to 106 providers. The largest holder is BT, with 6% of them.

Number type
Geographic numbers
01 / 02
Area
Various
0 area codes
Ofcom ranges
505
250 allocated
First allocated
1994
106 providers

Who were 01423 ranges given to?

Providers Ofcom allocated these number ranges to.

  • Not allocated to a provider255 ranges
  • BT31 ranges
  • Gamma Telecom Holdings Limited21 ranges
  • Vodafone Ltd (C&W)13 ranges
  • Sky UK Limited11 ranges
  • GCI Network Solutions Limited10 ranges
  • Magrathea Telecommunications Limited7 ranges
  • TalkTalk Communications Limited6 ranges
  • IOVOX Limited5 ranges
  • Digital Space Group Limited4 ranges
  • Voxbone SA3 ranges
  • Colt Technology Services3 ranges

+ 95 more

Range status

How Ofcom lists the ranges starting 01423.

Allocated · 250 Protected · 242 Free · 12 Quarantined · 1

Allocations by year

19942026

What do these statuses mean?

Explore by the next digit

Each block below starts 01423. Pick one to narrow it down.

What a 01423 number tells you

What it is

Ordinary landline numbers tied to a place. The area code tells you which dialling area the number was issued for – 0161 is Manchester, 020 is London, 01388 is Bishop Auckland.

What it costs

Charged as a normal UK call and usually included in landline and mobile allowances.

Watch out for

A local-looking number feels familiar, which is exactly why scammers spoof them. A local area code is not proof the caller is local.

The range holder isn’t necessarily the caller. Ofcom gives numbers to providers in blocks, and people and businesses can take their number with them when they switch. To find out who actually called, check the full number.
Questions

01423 numbers: common questions

Who owns 01423 numbers?

Ofcom allocated the ranges starting 01423 to BT, Gamma Telecom Holdings Limited, Vodafone Ltd (C&W) and others. Numbers can be moved between providers, so this shows who the range was originally given to – not who is using a particular number today.

How do I call a 01423 number from abroad?

Replace the leading 0 with +44. For example, a number starting 01423 becomes +44 1423 followed by the rest of the number.

How much does it cost to call a 01423 number?

Charged as a normal UK call and usually included in landline and mobile allowances.

Is a call from a 01423 number a scam?

A local-looking number feels familiar, which is exactly why scammers spoof them. A local area code is not proof the caller is local. Check the full number on Who’s Calling to see if it belongs to a verified business and what other people have reported.

Did a 01423 number call you?

Check the full number to see if it belongs to a verified UK business and what other people have reported.

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