Phone Validator
Paste a phone number such as +1 415 555 2671, 020 7946 0958 or +33 1 42 68 53 00 and validate its structure with country-aware numbering metadata. The tool distinguishes possible, valid and invalid numbers, can require a match with the selected region, and shows E.164, international, national and RFC 3966 formats when parsing succeeds. Validation runs on the application server with an offline metadata library; it does not contact a carrier or lookup API.
How the phone validator works
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1
Enter one or more numbers
Paste a single phone number or a short batch separated by lines, commas or semicolons. Extensions such as x123 are parsed when the numbering library recognizes them.
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2
Choose the default region
Local numbers need a country context. A UK number like 020 7946 0958 is parsed differently from a US local number unless it starts with an international calling code.
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3
Read validity and formats
Each result shows valid, possible or invalid status, detected region, country code, type, E.164, international, national and RFC 3966 formats.
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4
Copy normalized E.164 output
Valid numbers can be copied as E.164 lines, the safest storage format for databases, CRMs and APIs.
What makes a phone number valid?
A phone number is not just “digits with a plus sign”. Each country has its own numbering plan: length ranges, prefixes, mobile vs fixed-line ranges, toll-free patterns and trunk prefixes. A number can be possible because the length is plausible, but still not valid because its prefix is not assigned to that region or type.
This validator uses the same style of metadata as Google’s libphonenumber project. That means it can understand common punctuation, spaces, parentheses, international + prefixes, 00 international dialing prefixes and many extension notations. It does not guess whether a line is active or reachable; it validates the number’s structure.
E.164 vs national format
| Format | Example | Best use |
|---|---|---|
| E.164 | +14155552671 |
Databases, APIs, deduplication |
| International | +1 415-555-2671 |
Human-readable global display |
| National | (415) 555-2671 |
Local display within the detected region |
| RFC 3966 | tel:+1-415-555-2671 |
Click-to-call links and structured tel URIs |
For storage, E.164 is usually the right answer because it removes punctuation and local trunk ambiguity while preserving the country calling code.
Important limits
- No deliverability check. A structurally valid number can still be inactive, disconnected or unable to receive SMS.
- No HLR/carrier lookup. The tool does not contact carriers or lookup APIs.
- Region context matters. Local numbers without a
+prefix are interpreted using the selected default region. - Strict region mode is optional. Enable it when a form should only accept numbers belonging to the selected country.
- Batch and input limits apply. The tool reads at most 25 entries, truncates each entry to 120 characters and limits the shared input to 2,000 characters.
- Input is server-processed. Live results send the entered numbers to the application server, and the step-by-step mode includes them in the results URL. Do not enter confidential phone numbers.
Examples to try
| Input | Default region | Expected result |
|---|---|---|
+1 415 555 2671 |
US | Valid US number, E.164 +14155552671 |
020 7946 0958 |
GB | Valid UK fixed-line style number |
+33 1 42 68 53 00 |
US or FR | Valid French number because the +33 prefix overrides the default region |
12345 |
Any | Too short or invalid for normal phone-number storage |
Frequently Asked Questions
No. It validates numbering-plan structure and formatting only. It does not call, text, ping, HLR-check or query a carrier database.
E.164 is the compact international format that starts with + and the country calling code, with no spaces or punctuation. It is the preferred storage format for most CRMs, signup forms and APIs.
Numbers without a leading + are local or national. The default region tells the parser which country rules to apply. International numbers with a + prefix usually override that setting.
Yes. Paste up to 25 numbers separated by new lines, commas or semicolons. Valid numbers are gathered into a copy-ready E.164 list.
The numbers are sent to the application server, where an offline numbering metadata library validates them. The step-by-step mode may also put them in the page URL. No carrier, HLR or third-party lookup API is called, but you should not enter confidential numbers.
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