A phone number validator that cleans dialler lists
Validate, format, and classify phone numbers.
The Kavex phone number validator takes a column of messy phone numbers and hands back clean, classified, correctly formatted data. It confirms whether each number is valid, detects its country, tells you if it is a mobile, landline or VOIP line, and returns it in both E.164 and national formats. For any team that dials or texts, that means fewer wasted attempts and a list your tools will actually accept. You pay per number checked.
A RUN OF 1,000 NUMBERS ON THIS SOURCE, AT 1 PER NUMBER
Six columns on every row.
These come with the run and cost nothing extra. Add-ons widen the same sheet, and you pay only for the ones you switched on.
| Input | Valid | Country | Type | E.164 | National |
|---|---|---|---|---|---|
| 06 12345678 | yes | NL | mobile | +31612345678 | 06 12345678 |
| (020) 705 1180 | yes | NL | landline | +31207051180 | 020 705 1180 |
| +44 7700 900123 | yes | GB | mobile | +447700900123 | 07700 900123 |
| 555-0199 | no | · | · | · | · |
| +49 30 5557 8890 | yes | DE | landline | +493055578890 | 030 55578890 |
Say what you want. Read the price first.
Everything else is a ceiling or a filter. The estimate moves with the numbers you type, so the run never surprises you at the end.
The phone number validator inspects each number against the official numbering rules for its country. It strips the inconsistent formatting real lists are full of, spaces, dashes, brackets, missing or doubled country codes, and works out whether what remains is a genuine, diallable number.
For every valid number it returns the country, the line type, and two clean formats: E.164 for software and tools, and the national format for humans. Line type matters for outreach, knowing a number is a mobile tells you it can take an SMS, while a landline or VOIP line cannot.
Numbers that cannot be made valid are flagged with a reason rather than silently dropped, so you can see exactly which rows need attention. The result is a list that imports cleanly into a dialler or SMS platform on the first try.
Validation also protects the tools downstream. Most diallers and SMS platforms reject or silently drop malformed numbers on import, which means a messy list quietly loses contacts before the first call is ever placed. Running the phone number validator first means every row that reaches your dialler is already in a format it accepts, already tagged with a country, and already sorted into mobile and landline. For teams that work several countries at once, that consistency is the difference between a clean campaign and an afternoon spent reconciling formats by hand. The job also returns a clear count of how many numbers were valid, so you can judge a source list at a glance.
The phone number validator applies the same numbering metadata that powers carrier and operating-system phone handling, the length rules, prefixes and ranges each country defines. It parses a number, normalises it, and checks it against those rules to decide validity, country and line type.
Because it works from numbering rules rather than placing a call, the phone number validator is fast and runs entirely on a list, no external lookups, no waiting on a network. A large file is processed almost instantly and downloaded with every column added.
Charged per delivered row. If the source holds fewer than you asked for, the rest of the credits go back to your balance the second the run ends.
One thousand numbers, itemised.
One line, because this source has nothing bundled on top. You pay the rate times the rows the run actually delivered.
| Line | Rate | Units | Credits |
|---|---|---|---|
| Phone Validator | 1 / number | 1,000 numbers | 1,000 |
| 1,000 numbers | 1 / number | 1,000 credits | $1.00 |
$0.001 PER FINISHED NUMBER · ONLY DELIVERED ROWS ARE BILLED
What people point it at.
Four ways this source is used today. Every one of them is the same run, the same export and the same credit pool.
- Sales teams cleaning a phone column before it is imported into a dialler or power-dialling tool.
- SMS marketers filtering a list down to mobile numbers, the only lines that can receive a text.
- RevOps standardising messy international numbers into a single consistent format across a CRM.
- Support teams validating customer phone numbers at the point of import to cut failed callbacks.
The rest of the web, contact & ai stack.
Same credit pool, same export. Chain the output of one run into the next without paying for the list twice.
Asked before the first run.
Short answers, no accordion to click through. If something is still missing, the help pages go deeper.
What line types can it identify?
It classifies valid numbers as mobile, landline or VOIP where the country numbering plan makes that distinction. That lets you separate the numbers that can receive an SMS from those that cannot.
What counts as an invalid number?
A number is invalid if it does not match the length and prefix rules for any country, for example a missing country code, too few digits or an unassigned range. Invalid rows are flagged with a reason so you can fix or drop them.
Does it handle international numbers?
Yes. It detects the country from the number itself and validates against that country’s rules, so a mixed international list is cleaned and standardised in a single job.
How do results export?
Results download as a CSV with validity, country, line type and both the E.164 and national formats added next to your original input column.