Bulk Phone Number Carrier & Line Type Validator (NANP)

Validate US, Canadian, and wider NANP phone numbers and get back the carrier of record, not just a format check. Returns operating company, incumbent carrier, wireless-vs-landline classification, rate centre, local time, and a TCPA calling-window flag for every number you submit.

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Carrier Validator Features

• Numbering-plan validation for any country — is_valid, is_possible, number_type, region_code.
• Real carrier of record for NANP numbers — operating company name, OCN, and the incumbent carrier for that rate centre. Most "carrier lookup" tools stop at guessing from the area code.
• Wireless-vs-landline flag at the thousand-block level. That's the granularity carrier assignment actually happens at, so an NXX-level guess is wrong for any pooled prefix.
• TCPA calling-window check — local time at the number's rate centre, derived from real coordinates, plus a boolean for whether it's currently between 08:00 and 21:00 there.
• Dead-number signal — flags a thousand-block that's on file as disconnected.
• Honest confidence labels on every row (exact_block, nxx_level, plan_only) instead of pretending every answer is equally certain.

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Who Uses Phone Carrier & Line Type Data?

• TCPA compliance reviewers — confirm a number is wireless before a campaign treats it as landline, and check the calling window before a dial, not after a complaint.
• SMS / outbound sales teams — wireless vs. landline decides whether a text will even deliver. Knowing before you dial beats finding out from a bounce report.
• CRM hygiene runs — validate and enrich a phone column in the same pass you're already running an email or address cleanup in.
• Lead-gen and list brokers — attach a real carrier field to a list instead of the offline format guess every other tool ships.
• Debt collection and skip-tracing shops — the dead-number signal and portability caveat matter more here than almost anywhere else.

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How the Carrier Validator Works

1. Submit a list of phone numbers in any reasonable format — E.164, national, or a bare 10-digit NANP number.
2. Each number gets a full numbering-plan validation, then, for NANP numbers, the actor resolves the exact thousand-block that owns it against public NANP number-administration data.
3. Rate-centre coordinates feed a timezone lookup, which produces the number's local time right now and whether it falls inside the 08:00–21:00 calling window.
4. You get one row per input number, in the order you submitted them, with an honest confidence label on the carrier fields.

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Input

{
  "phoneNumbers": [
    "+1 212-380-4567",
    "+1 800 555 0100",
    "not a phone number"
  ],
  "defaultRegion": "US",
  "maxItems": 15
}

Field	Type	Default	Description
phoneNumbers	array	required	Phone numbers to validate. Any format works — E.164, national, or a bare 10-digit NANP number.
defaultRegion	enum	US	Region assumed for a number with no country code. US or CA. Only matters for national-format input.
maxItems	integer	15	Hard cap on the number of phone numbers processed per run.

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Carrier Validator Output Fields

{
  "input": "+1 212-380-4567",
  "e164": "+12123804567",
  "country_code": "1",
  "national_number": "2123804567",
  "is_valid": true,
  "is_possible": true,
  "region_code": "US",
  "npa": "212",
  "nxx": "380",
  "thousand_block": "4",
  "number_type": "fixed_line",
  "is_toll_free": false,
  "toll_free_pattern": null,
  "carrier_ocn": "829J",
  "carrier_name": "PAETEC ITEL, LLC",
  "carrier_type": "CLEC",
  "ilec_ocn": "9104",
  "ilec_name": "VERIZON NEW YORK, INC.",
  "is_wireless_block": false,
  "is_voip_block": false,
  "rate_center": "New York City Zone 01",
  "rate_center_state": "NY",
  "lata": "132",
  "switch_clli": "NYCMNYBXX6X",
  "switch_type": "POI",
  "rate_center_lat": 40.739362,
  "rate_center_lon": -73.991043,
  "timezone": "America/New_York",
  "utc_offset": -4,
  "local_time_now": "2026-09-28T15:42:00",
  "is_within_calling_window": true,
  "block_effective_date": null,
  "block_disconnect_date": null,
  "is_disconnected_block": false,
  "assignment_last_updated": "2026-09-01",
  "carrier_confidence": "exact_block",
  "portability_caveat": true,
  "validation_reasons": ["POSSIBLE_LENGTH_OK", "NUMBERING_PLAN_VALID", "NANP_DECOMPOSED", "CARRIER_BLOCK_EXACT"]
}

Field	Type	Description
input	string	Original input string, as supplied.
e164	string	Normalised +1NPANXXXXXX form. Null when the number doesn't validate.
country_code	string	Country calling code — "1" for every NANP member.
national_number	string	National significant number, digits only.
is_valid	boolean	Numbering-plan validity — not "does it ring."
is_possible	boolean	True when the number has a plausible length for its region.
region_code	string	ISO2 territory — US, CA, PR, VI, GU, AS, MP, BS, BB, JM, and other NANP members.
npa	string	Area code (NANP numbers only).
nxx	string	Central-office/exchange code (NANP numbers only).
thousand_block	string	The 7th digit — carrier assignment happens at this level, not the NXX.
number_type	string	fixed_line, mobile, fixed_or_mobile, voip, toll_free, premium, shared_cost, pager, or uan.
is_toll_free	boolean	True for the seven NANP toll-free area codes.
toll_free_pattern	string	Which toll-free area code matched (800, 833, 844, 855, 866, 877, 888).
carrier_ocn	string	Operating Company Number — the carrier identifier of record.
carrier_name	string	Carrier name of record for this thousand-block.
carrier_type	string	ILEC, CLEC, wireless, or VoIP-interconnected.
ilec_ocn	string	Incumbent carrier's OCN for this rate centre.
ilec_name	string	Incumbent carrier name for this rate centre.
is_wireless_block	boolean	True when the block is assigned to a wireless carrier — the TCPA-relevant flag.
is_voip_block	boolean	True when the block is assigned to a VoIP-interconnected CLEC.
rate_center	string	Rate centre name.
rate_center_state	string	State/province/territory of the rate centre.
lata	string	Local Access and Transport Area code.
switch_clli	string	Common Language Location Identifier of the serving switch.
switch_type	string	Switch/office type code.
rate_center_lat / rate_center_lon	number	Rate centre coordinates.
timezone	string	IANA timezone derived from the rate centre's coordinates.
utc_offset	number	Current UTC offset (hours) for that timezone.
local_time_now	string	Current local time at the rate centre — the field an outbound dialer actually needs.
is_within_calling_window	boolean	True between 08:00 and 21:00 local time — the TCPA calling-window check.
block_effective_date	string	Date this block assignment took effect, when published.
block_disconnect_date	string	Date this block was disconnected — a dead-number tell. Null if still active.
is_disconnected_block	boolean	True when a disconnect date is on file for this block.
assignment_last_updated	string	Date the underlying record for this block was last updated.
carrier_confidence	string	exact_block, nxx_level, or plan_only — honest about how granular the carrier match is.
portability_caveat	boolean	True whenever carrier data is returned — a ported number's block carrier is the original assignee, not necessarily the current one.
validation_reasons	array	Rule ids behind is_valid / number_type / carrier_confidence — auditable, not a black box.
scraped_at	string	When this record was produced.

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FAQ

How do I look up the carrier for a phone number?

Pass it in phoneNumbers in any reasonable format. The validator returns the carrier of record, the incumbent carrier, and a wireless-vs-landline flag in the same row as the standard numbering-plan checks.

Does this work for Canadian numbers?

Yes — NANP covers the US, Canada, and a handful of Caribbean members, and all of them share the same numbering structure. Set defaultRegion to CA if you're passing bare national-format numbers without a country code.

What does carrier_confidence actually mean?

exact_block means the answer is specific to your number's exact thousand-block. nxx_level means the whole exchange is assigned to one carrier so there's no finer distinction to make. plan_only means there's no carrier assignment on file — either the number is outside NANP, or the prefix is unassigned or reserved.

Can I tell if a number is a landline or a cell phone?

That's is_wireless_block. Most numbering-plan-only validators can't answer this for NANP numbers at all — the plan itself doesn't separate mobile ranges the way many other countries do, so this validator answers it from the carrier assignment instead.

Do I need an account or API key?

No. Submit numbers and get results — no signup, no key, no per-number vendor fee.

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Need More Features?

Need a different field, a bulk-file input, or coverage beyond NANP? File an issue or get in touch.

Why Use This Carrier Validator?

• Answers the question everyone else guesses at — real carrier of record, not a format parse dressed up as one.
• Built for the compliance use case, not just the sales one — the wireless flag and calling-window boolean are the two facts a TCPA-conscious dialer actually needs, computed together instead of pieced together from two tools.
• Says what it doesn't know — a ported number, an unassigned prefix, or a non-NANP number all come back with an honest confidence label instead of a confident-looking wrong answer.