NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 712
QWEST CORPORATION 64
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2020-09-23 712-399 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → QWEST CORPORATION 9631 MALVERN IA
2019-09-18 712-591 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9631 HAMBURG IA
2001-03-02 712-396 2XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-225 7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9631 CHEROKEE IA
— 712-233 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-234 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-239 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-243 0XXX which blocks → QWEST CORPORATION 9631 ATLANTIC IA
— 712-246 8XXX9XXX which blocks → QWEST CORPORATION 9631 SHENANDOAH IA
— 712-252 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-255 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-258 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-262 not yet reported which blocks → QWEST CORPORATION 9631 SPENCER IA
— 712-264 2XXX5XXX which blocks → QWEST CORPORATION 9631 SPENCER IA
— 712-266 3XXX4XXX5XXX6XXX · 3 holders which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-274 3XXX which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-276 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-277 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-279 not yet reported which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-283 0XXX1XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → QWEST CORPORATION 9631 SIOUX RPD IA
— 712-284 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9631 ALTA IA
— 712-293 none assigned yet which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-294 2XXX3XXX4XXX6XXX · 2 holders which blocks → QWEST CORPORATION 9631 SIOUX CITY IA
— 712-322 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-323 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-324 1XXX which blocks → QWEST CORPORATION 9631 SHELDON IA
— 712-325 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-326 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-328 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-329 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-332 0XXX1XXX4XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 ARNOLDS PK IA
— 712-335 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → QWEST CORPORATION 9631 POCAHONTAS IA
— 712-336 not yet reported which blocks → QWEST CORPORATION 9631 SPIRITLAKE IA
— 712-337 1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → QWEST CORPORATION 9631 ARNOLDS PK IA
— 712-338 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 MILFORD IA
— 712-347 not yet reported which blocks → QWEST CORPORATION 9631 CARTERLAKE IA
— 712-352 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-362 0XXX1XXX · 2 holders which blocks → QWEST CORPORATION 9631 ESTHERVL IA
— 712-366 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-372 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 CORECTINVL IA
— 712-373 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 ANTHON IA
— 712-382 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9631 HAMBURG IA
— 712-388 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-423 0XXX4XXX5XXX6XXX · 3 holders which blocks → QWEST CORPORATION 9631 ONAWA IA
— 712-458 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 WHITING IA
— 712-485 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 NEOLA IA
— 712-525 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 SILVERCITY IA
— 712-526 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 MINEOLA IA
— 712-527 0XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 GLENWOOD IA
— 712-545 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → QWEST CORPORATION 9631 CRESCENT IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.