NANPA numbering reports

What it is

The administrator the FCC appoints for the North American plan publishes, every day, which central office codes (NPA-NXX, ten thousand numbers each) are assigned and to which carrier, and, inside the pooled codes, which blocks of a thousand are assigned, retained or free and to whom. Its rate centre report spells out the abbreviations those files use for places, and its NPA report describes every area code: where it serves, when it went into service and which codes overlay it.

What the copy installed here holds

Counts only. Holders are counted, never named, and no row of the table is republished here: the publisher’s own files are linked below.

How the rows read, and what a number outside them answers

An assigned code (AS) reads as allocated to its holder; an unavailable code (UA), such as N11 or 555, as reserved. An assigned or retained thousands-block reads as allocated to its own carrier; an available block as unassigned. A contaminated available block, and one available only from a future date, is left to its code.

Complete for geographic numbers: while the copy installed here is under 45 days old, a geographic number outside every listed block answers unassigned_block.

The files

• CoCodeAssignment_Utilized_AllStates_Public.zipZIP of one tab-separated text file, headed by a “File Updated” date. Every assigned (AS) and unavailable (UA) central office code with its holder, OCN, rate centre, assignment date and pooled and in-service flags.the page that links it
• ThousandsBlockAssignment_All.zipZIP (about 12 MB) of one comma-separated file (about 112 MB). Every block of a thousand in a pooled code, with its status (assigned, retained, available), the carrier it is assigned to and its OCN.the page that links it
• NPARateCenterAllStatesReport.XLSXExcel workbook, dated by its creation time. The full name of each rate centre abbreviation, state by state.the page that links it
• npa_report.csvCSV headed by a “File Date”. One row per area code: where it serves, whether it is assigned and in service and since when, its overlay complex, NANPA’s time-zone letters and the dialling plan.the page that links it

The terms, as the publisher states them

nanpa.com publishes no terms of use and no licence for its reports: the only policy the site links is a privacy policy. The reports are posted openly by the administrator the FCC appoints. Spaw shows facts and counts read from them, credits NANPA with the file date, and does not republish the files.

terms checked 2026-09-26

What the table cannot say

• A regulator’s table records the original allocation of each block, never who serves a number today: a number ported to another carrier keeps its block.
• An allocated block says a number in it can be in service, not that it is.
• The counts are rows of the regulator’s own table, not numbers or traffic: a busy block and an empty one count once each.
• Mobiles and landlines share the same blocks in the North American plan, so the file cannot say which a number is; the holder’s name settles it only where it names a wireless carrier or a virtual-number wholesaler.
• Toll-free (8XX) and the other non-geographic codes are not in the files, so only geographic numbers outside them are answered as unassigned.
• A block its holder retained when the code was pooled carries no date.

The risk signals read from it

• reserved_block · the regulator's table marks the block reserved (+40)
• virtual · the block is held by a virtual-number wholesaler or VoIP provider (+40)

The other sources of a phone answer

• CNAC central office code status
• Ofcom numbering data
• ARCEP numbering resources
• ACMA numbering register
• ACM number register
• NAD number register
• Mexico’s national numbering plan
• UKE numbering tables
• MIMIT assigned numbering
• libphonenumber
• SMS-receiving number lists
• FTC Do Not Call reported calls
• Every source, and the regulators not synced
• Where each field comes from
• Look up a number

counts read from the installed tables · terms checked 2026-09-26