E.164 Phone Number Format Checker
Check any phone number's E.164 format in 2 seconds. Validates country code, line type (mobile vs landline), and regional numbering-plan format. No signup required, 25 free checks per day.
Runs in your browser, no signup. International format with a leading + is recommended.
Check a phone number's format
This free checker normalizes any phone number to E.164 international format, validates the country code and regional numbering plan, and detects the line type (mobile, landline, VoIP, or toll-free) in under a second. Format checks catch 70-80% of bad numbers; confirming a number is actually in service requires a live HLR lookup.
Join 2,000+ GTM teams
Who uses the E.164 Phone Number Format Checker?
Teams across go-to-market rely on clean, verified data. Here is where this tool fits.
Sales teams
Stop wasting reps' time on dead leads and bad data before outreach.
Marketers
Clean lists before a campaign to protect deliverability and spend.
Recruiters
Confirm candidate contact details are real before reaching out.
Founders
Validate key contacts before emailing partners, investors, or buyers.
RevOps
Keep the CRM accurate so routing, scoring, and reporting hold up.
Agencies
Double-check client data before it ever touches a live campaign.
How Does This Tool Work?
Phone numbers in B2B databases are routinely wrong, wrong country code, missing area code, or assigned to a different person entirely. Industry data-decay estimates suggest 23-31% of phone numbers in the average B2B CRM are invalid or unreachable. Every wasted dial costs 90-120 seconds of rep time, and reps already spend 28% of their time on data tasks instead of selling.
This free phone validator runs four checks in real time: (1) E.164 format normalization, (2) country code validation, (3) number-type detection (mobile vs landline vs VoIP vs toll-free), and (4) regional format compliance. Results return in under 1 second, no signup required.
For bulk validation plus carrier lookup and HLR (Home Location Register) checks against live mobile networks, sign up for a free Cleanlist account (30 credits). Full validation typically catches 95-99% of invalid numbers vs 70-80% with format-only checks.
** Validation runs in layers. 164 and checks the country code and numbering plan, catching typos, wrong country codes, and impossible area codes. Carrier lookup identifies the operator and line type. HLR (Home Location Register) lookup queries the live mobile network to confirm the SIM is active, the only layer that reliably catches reassigned and disconnected numbers.
** Knowing the line type protects both deliverability and compliance. Mobile numbers are TCPA-restricted in the US, VoIP numbers carry higher fraud and disconnect risk, and landlines cannot receive SMS. This checker labels each number by type so you route mobiles, landlines, and VoIP correctly before you dial or text.
** This tool checks one number at a time. To validate a whole list, upload a CSV to a free Cleanlist account and run bulk phone validation with carrier lookup, line-type detection, and HLR confirmation in a single pass, then sync clean numbers back to your CRM.
For a side-by-side of the top validators, see our guide to the best phone validation tools.
Which Free Email Lookup Tools Work Together?
Free, purpose-built tools that work together. Start from a name, a domain, an email, or a block of text, and move to a verified contact.
Email Verifier
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Data Quality Score Calculator
Grade your CRM health from bounce rate, duplicates, and data age.
CRM Cleanup ROI Calculator
Put a dollar figure on what bad CRM data costs you each year.
B2B Contact Finder
Find business contacts and predicted email patterns by company domain.
What Can the Full Platform Do in 5 Minutes?
This free tool is the tip of Cleanlist. Watch a real ICP search go from query to enriched, validated, CRM-ready list in under five minutes. 36 leads, 100% contact fill, synced to HubSpot.
36 ICP leads, 100% contact fill, validated and pushed to HubSpot in one flow
Want more phone validations? Start free today.
Format checks are free here. Cleanlist runs carrier and HLR checks on your whole list to catch disconnected and reassigned numbers. 30 free credits, no card.
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| Feature | Free | Starter | Pro | Scale |
|---|---|---|---|---|
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| Export CSV | ||||
| Leads per List | 100 | 2,500 | 2,500 | Unlimited |
| Seats included | 1 | 2 | 5 | 10 |
| Additional seats | — | $20/seat | $20/seat | $20/seat |
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| Playbooks | ||||
Integrations | ||||
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Frequently Asked Questions
How does this free phone number validator work?
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It runs four checks in under 1 second: (1) E.164 format normalization, converts any phone format to canonical international format, (2) country code validation against the ITU-T E.164 standard, (3) number-type detection (mobile, landline, VoIP, toll-free), and (4) regional format compliance. No call is placed; the tool only validates against published numbering plans.
Does the validator confirm the phone is in service?
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No, the free tool validates format and number-type only. To confirm whether a phone is actually in service (HLR check against the live mobile network), use Cleanlist's full phone validator. HLR lookups confirm the SIM is active, catching the 23-31% of B2B phone numbers that pass format checks but are no longer reachable.
What's the difference between phone validation and verification?
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Phone validation checks the number is properly formatted and follows numbering rules (this free tool). Phone verification confirms the number is actually in service via SMS, voice, or HLR check (paid tier). Validation catches 70-80% of bad numbers; full verification catches 95-99%.
Can I validate phone numbers in bulk?
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This free tool validates one number at a time (25/day). For bulk validation (100 to 1M+ numbers), upload a CSV to a free Cleanlist account, 30 credits to start, then $0.005-0.01 per number at scale. Bulk includes E.164 normalization, carrier lookup, line-type detection, and HLR confirmation.
Is the phone validator accurate for international numbers?
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Yes, supports all 200+ countries with valid E.164 country codes. Format validation works for US, Canada, UK, EU, Australian, and other international numbers. Carrier lookup and HLR (paid tier) coverage is strongest in North America and Western Europe.
Why are my phone numbers showing as invalid?
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Three common causes: (1) wrong country code (+1 prefixed to a UK number, etc.), (2) extra or missing digits, or (3) entirely fake numbers. Bought B2B phone lists frequently contain fakes, this is why bulk validation before any cold-call campaign is essential.
How does this compare to Twilio Lookup?
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Twilio Lookup is a paid API ($0.005-0.04/lookup) for developers validating user-input phone numbers in apps. This tool is free, browser-based, and designed for sales/marketing pre-send list cleaning. For developer use, Twilio is solid; for B2B prospecting list cleaning, Cleanlist's bulk validator is purpose-built.
Is phone validation legal?
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Yes. Format validation only references published numbering plans; no calls are placed and no personal data is queried. Phone numbers you call after validation must still comply with TCPA (US), CASL (Canada), GDPR (EU), and other regional telecom regulations.
Which phone validation tool is best for cleaning a bulk list?
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For a whole list, a platform that pairs validation with enrichment beats a single-number checker. Cleanlist validates phone numbers in bulk with carrier and HLR checks, catches the 23-31% of B2B numbers that are invalid or reassigned, then enriches and syncs the clean records to your CRM. This free checker is the fast way to test one number before you commit.
You formatted one number. Upload your CSV and check every phone on the list, 30 rows free.
Verified data enrichment and email verification across 15+ providers. 30 free credits, no card required.
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