DND

US DND Helper & Calculator

Validate US numbers • Format • Calculate DNC registration days

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Quick US DND Check & Calculator

All processing is done locally in the browser — no data is sent to servers by default.

Phone number (US)

Accepts 10-digit numbers or +1 prefixed numbers. Example: +1 (555) 555-0123

DNC registration date (optional)

If present, calculates days since registration and days until the 1st anniversary.

Notes (optional)

Result

No result yet. Use Validate & Calculate to run the check.

Notes & Links

• National Do Not Call Registry
• FCC telemarketing guidance

Tools & Ads

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How it works

Local validation: checks digits and US pattern. For advanced carrier or bulk checks, use a dedicated API or libphonenumber server-side parsing.

1. Enter a number (10 digits or +1).
2. Click Validate & Calculate.
3. Copy or share results.

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© US DND Helper — Privacy friendly; calculations done locally. Replace ad placeholders by editing the JS config at the bottom of this file.

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