Vietnam (+84 / 0084): 9 digits
Locals write 091 234 56 78. An API wants +84912345678. Paste any Vietnam number below to see it normalised, validated, and identified.
# free & rate-limited · no signup · live results from the same engine as the API
Since the engine is the same one the API runs, a key does not buy you a better answer. It buys volume, bulk jobs and a signed receipt.
How Vietnam numbers are written
- Country calling code
- +84
- Dialled from abroad
- 0084 (011 84 from the US and Canada)
- ISO country code
- VN
- National number length
- 9 digits
- Trunk prefix
- 0 (dropped in E.164)
- Written locally
- 091 234 56 78
- E.164 format
- +84912345678
What +84 means
+84 is the country calling code for Vietnam. The same code is written 0084 when you dial out from most of Europe, Africa and Asia, and 011 84 from the US and Canada. All three reach the same place: only the exit code in front of it changes. Whichever one you use, the national trunk 0 is dropped once the country code is in front.
Mobile numbers
Mobiles start with 3, 5, 7, 8 or 9 after the 2018 renumbering.
Converting to E.164
Take the number as written locally (091 234 56 78), drop the leading 0, then prefix +84. The result is +84912345678: 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 Vietnam 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.
That is how a Vietnam 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.