Tools / Diagnostic / Vol I

Phone-Number Lookup

Paste a phone number in any format and get the country (matched against the ITU-T E.164 country-code registry), the NANP area-code state / province if it's a North-American number, special-code classification (toll-free, premium, N11 emergency / community services, the fictional 555 range), and the number rendered in every format VoIP gear and dialplans expect: E.164, national, international, tel: URI.

Everything runs in your browser. The number you paste is never sent to any server — no network requests, no logging.

Input

Accepts: +1 415 555-1234, (415) 555-1234, 1.415.555.1234, +44 20 7946 0958, 011 33 1 70 75 75 75, 911. Spaces, dashes, parentheses, and dots are stripped.

Result

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Formats

Country

Reading the number

E.164 is the lingua franca

E.164 is the ITU-T global numbering plan — +CC NSN, where CC is the country code (1–3 digits) and NSN is the national number (up to 15 digits total). Every SIP From:, To:, and P-Asserted-Identity: URI should carry a fully-qualified E.164 number with the leading +. The decoder normalizes anything you paste back into this form.

NANP is country code 1

The North American Numbering Plan covers the US, Canada, and 24 Caribbean / Pacific countries — all share country code 1. NANP numbers are 10 digits: NPA (3) + NXX (3) + subscriber (4). The NPA → state/province lookup here covers all assigned NPAs as of 2026.

NPA ≠ rate center

The NPA (area code) tells you which state or province a number was originally assigned to — not where the owner lives today. Mobile-number portability and the OCN / rate-center detail live in LERG (Telcordia / iconectiv, subscription-only); the calculator stops at NPA-level state mapping. For real LERG lookups, use a paid service.

Toll-free NPAs

800, 833, 844, 855, 866, 877, 888 are all NANP toll-free codes — billed to the called party. The calculator flags any number with these NPAs. Vol II §"IRSF and CNAM Abuse" walks the abuse patterns that target this space.

Premium-rate (900)

NPA 900 is reserved for premium-rate services in the US — calls billed at a higher per-minute rate by the service provider, settled back to the called party. Long the favorite landing pad for IRSF; modern carriers usually block or audit outbound 900 by default.

N11 community / emergency codes

Three-digit dialed codes for community services: 211 social services, 311 non-emergency government, 411 directory, 511 traffic / transit, 611 carrier customer service, 711 TRS (Telecommunications Relay Service), 811 utility-locate (Call Before You Dig), 911 emergency, 988 Suicide & Crisis Lifeline. Kari's Law / RAY BAUM's Act make 911 reachable from any-station-any-device on enterprise PBXs.

555-01XX is fictional

NANP NXX = 555, line range 0100–0199, is permanently reserved for fictional use — books, movies, training material. The case files in Vol I and the pcap library use this range exclusively. Other 555 line ranges (0000–0099, 0200+) are assigned for real services like 555-1212 directory.

Long country codes

Country codes are 1–3 digits. The matcher tries the longest prefix first — so +1 is NANP while +1670 is reserved (Northern Mariana — actually NANP but with the area code 670). The mapping covers all 250+ ITU-T-assigned codes plus the special prefixes for satellite and Inmarsat services.