Denmark (+45 / 0045): 8 digits
Locals write 20 12 34 56. An API wants +4520123456. Paste any Denmark number below to see it normalised, validated, and identified.
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How Denmark numbers are written
- Country calling code
- +45
- Dialled from abroad
- 0045 (011 45 from the US and Canada)
- ISO country code
- DK
- National number length
- 8 digits
- Trunk prefix
- None
- Written locally
- 20 12 34 56
- E.164 format
- +4520123456
What +45 means
+45 is the country calling code for Denmark. The same code is written 0045 when you dial out from most of Europe, Africa and Asia, and 011 45 from the US and Canada. All three reach the same place: only the exit code in front of it changes. Denmark uses no trunk prefix, so the national number follows the code unchanged.
Mobile numbers
No trunk prefix and no area codes: every number is eight digits.
Converting to E.164
Take the number as written locally (20 12 34 56), add the +45 prefix (there is no trunk digit to remove). The result is +4520123456: no spaces, no dashes, no parentheses. Store that, and format for display only when you show it to a human.
Why not do it with a regex
A pattern that matches Denmark numbers today breaks the moment a new mobile range is allocated, and it cannot tell you whether the number is actually assigned. The tool above runs the same numbering-plan engine as our phone validation API, so it also reports line type and region rather than just shape.
Denmark has no area codes at all
Denmark abolished area codes in 1989. Every number is exactly eight digits, there is no trunk prefix to drop, and the first digits carry no geography — a number starting 34 is not a region, it is just a number. Nothing in a Danish number tells you where its owner is, and since 2008 the ranges no longer reliably separate mobile from landline either.
Denmark phone numbers, answered
What is a +45 phone number?
+45 is Denmark. Danish numbers are eight digits with nothing in front of them: 20 12 34 56 written locally is +4520123456 internationally. There is no leading 0 to remove, because Denmark has no trunk prefix.
How many digits is a Danish phone number?
Eight. Always. Unlike most of Europe there is no variation and no area code, so any Danish number that is not eight digits after +45 is wrong.
What are the area codes in Denmark?
There are none. They were removed in 1989 and the country moved to a flat eight-digit plan. If a form asks you for a Danish area code, the form is wrong.
That is how a Denmark number is written. Whether a whole list is worth dialling is the free call list cleaner, or check one number on the spam phone checker.