05 corporate & VoIP numbers
Ofcom’s numbering data lists 995 number ranges starting 05, allocated to 32 providers. The largest holder is BT, with 6% of them. 055 numbers are used for corporate networks; 056 numbers are location-independent numbers often used by internet (VoIP) phone services.
Who were 05 ranges given to?
Providers Ofcom allocated these number ranges to.
- Not allocated to a provider814 ranges
- BT64 ranges
- Network Rail Infrastructure Limited30 ranges
- Magrathea Telecommunications Limited23 ranges
- Flextel Limited9 ranges
- Inet Telecoms Ltd (Voipfone)9 ranges
- Colt Technology Services7 ranges
- MANX TELECOM TRADING LIMITED3 ranges
- Orange Business Holdings UK Limited3 ranges
- 24 Seven Communications Limited3 ranges
- CFL Communications Ltd2 ranges
- Andrews & Arnold Ltd2 ranges
+ 21 more
Range status
How Ofcom lists the ranges starting 05.
Allocations by year
Explore by the next digit
Each block below starts 05. Pick one to narrow it down.
What a 05 number tells you
What it is
055 numbers are used for corporate networks; 056 numbers are location-independent numbers often used by internet (VoIP) phone services.
What it costs
Costs vary by provider – check your tariff.
Watch out for
Because they are not tied to a place, these numbers say little about where a caller really is.
05 numbers: common questions
Who owns 05 numbers?
Ofcom allocated the ranges starting 05 to BT, Network Rail Infrastructure Limited, Magrathea Telecommunications Limited 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 05 number from abroad?
Replace the leading 0 with +44. For example, a number starting 05 becomes +44 5 followed by the rest of the number.
How much does it cost to call a 05 number?
Costs vary by provider – check your tariff.
Is a call from a 05 number a scam?
Because they are not tied to a place, these numbers say little about where a caller really is. 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 05 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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