NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 319
QWEST CORPORATION 99
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
— 319-373 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-375 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-376 6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 FT MADISON IA
— 319-377 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-378 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-384 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-390 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-393 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-395 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-396 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-398 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-399 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-435 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 COGGON IA
— 319-447 7XXX which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-462 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 ANAMOSA IA
— 319-465 0XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 MONTICELLO IA
— 319-466 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-467 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-472 0XXX1XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 VINTON IA
— 319-483 0XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9631 WAVERLY IA
— 319-524 not yet reported which blocks → QWEST CORPORATION 9631 KEOKUK IA
— 319-526 0XXX1XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 KEOKUK IA
— 319-558 6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-654 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-688 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-743 2XXX5XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-752 not yet reported which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-753 not yet reported which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-754 not yet reported which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-758 not yet reported which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-768 6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 BURLINGTON IA
— 319-784 7XXX8XXX which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-786 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-832 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-833 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-834 0XXX9XXX which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-849 0XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 CENTER PT IA
— 319-859 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 CEDARFALLS IA
— 319-861 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-862 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-866 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-874 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-887 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-895 1XXX2XXX3XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9631 MT VERNON IA
— 319-896 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-983 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 PARKERSBG IA
— 319-984 0XXX1XXX2XXX3XXX4XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 DENVER IA
— 319-988 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9631 HUDSON IA
— 319-989 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 PARKERSBG IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.