01556 Area Code
The dialling code for Castle Douglas: what 01556 numbers are, who holds them, and what to do about a call you don't recognise.
What Is the 01556 Area Code?
Castle Douglas landline number. 01556 is the dialling code for Castle Douglas. Numbers starting 01556 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Castle Douglas.
Who was the range allocated to?
Ofcom has allocated 01556 numbers to 80 providers. The largest holders are BT, Digital Space Group Limited and (Aq) Limited.
Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Had a call from a 01556 number you don't recognise?
We can't tell you who called: an area code only shows the type of number and the provider Ofcom allocated the range to.
- Don't call back in a hurry, even if a message says it's urgent. Never give bank details or security codes on a call you didn't expect.
- Block the number from your phone's recent calls list.
- Forward scam texts free to 7726. Report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.
- Register your number with the Telephone Preference Service to opt out of sales calls.
About the 01556 Range
| Number type | Castle Douglas landline number |
|---|---|
| Area | Castle Douglas |
| Number format | 01556 XXXXXX |
| Allocated by Ofcom | 41% of the range, to 80 providers |
| First allocation on record | 15 July 1994 |
| Most recent allocation | 26 January 2026 |
Largest holders of 01556 numbers
| Provider (as allocated by Ofcom) | Share of range | First allocated |
|---|---|---|
| BT | 12% | 15 July 1994 |
| Digital Space Group Limited | 1% | 14 May 2008 |
| (Aq) Limited | 1% | 19 October 2011 |
| AQL Wholesale Ltd | 1% | 3 January 2008 |
| Andrews & Arnold (Numbers) Ltd | 1% | 19 March 2009 |
| Barritel Limited | 1% | 15 August 2006 |
74 more providers hold smaller blocks.
Allocation data: Ofcom numbering data, as published 28 October 2026.
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Common Questions About 01556 Numbers
Where is the 01556 area code?
01556 is the dialling code for Castle Douglas. Numbers starting 01556 are landline numbers for that area. Internet phone services can use them too, so a caller is not necessarily in Castle Douglas.
Is 01556 a mobile number?
No. 01556 is a landline (geographic) area code for Castle Douglas. UK mobile numbers start with 07.
Who does the 01556 range belong to?
Ofcom has allocated 01556 numbers to 80 providers. The largest holders are BT, Digital Space Group Limited and (Aq) Limited. Numbers can be moved (ported) between networks, so the network a caller uses today may not be the one Ofcom allocated the block to. The allocation does not identify the person or business using a number.
Who called me from a 01556 number?
We can't tell you who called. An area code only shows the type of number and which provider Ofcom allocated the range to. If you don't recognise a 01556 number, don't call back in a hurry, and never give out bank details or security codes on a call you didn't expect.
Block the number from your phone's recent calls list. Forward scam texts free to 7726, report unwanted marketing calls to the ICO, and see Ofcom's advice on scam calls.