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
UNITED STATES CELLULAR - IA 39
T-MOBILE USA, INC. 39
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 39
WINDSTREAM IOWA COMMUNICATIONS, INC. 37
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
— 319-318 0–9 XXXall 10 · 7 holders which blocks → TELNYX LLC 073H VINTON IA
— 319-321 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
— 319-329 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
— 319-330 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 IOWA CITY IA
— 319-331 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IOWA CITY IA
— 319-334 0XXX1XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 INDEPNDNCE IA
— 319-335 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-337 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-338 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-339 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-341 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-342 not yet reported which blocks → LA PORTE CITY TEL. CO. 1220 LAPORTE CY IA
— 319-345 0XXX5XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 REINBECK IA
— 319-346 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → QWEST CORPORATION 9631 PARKERSBG IA
— 319-347 4XXX7XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 APLINGTON IA
— 319-350 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 CEDAR RPDS IA
— 319-351 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-352 not yet reported which blocks → QWEST CORPORATION 9631 WAVERLY IA
— 319-353 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-354 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-356 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-358 not yet reported which blocks → QWEST CORPORATION 9631 IOWA CITY IA
— 319-360 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
— 319-361 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 CEDAR RPDS IA
— 319-362 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-363 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-364 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-365 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-366 none assigned yet which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-367 3XXX4XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 NEW LONDON IA
— 319-368 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-369 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-371 1XXX2XXX3XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 FT MADISON IA
— 319-372 not yet reported which blocks → QWEST CORPORATION 9631 FT MADISON IA
— 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
— 319-385 not yet reported which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MTPLEASANT IA
— 319-389 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
— 319-390 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-392 not yet reported which blocks → DANVILLE MUTUAL TEL. CO. 1147 DANVILLE IA
— 319-393 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-394 not yet reported which blocks → MEDIAPOLIS TEL. CO. 1251 MEDIAPOLIS 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
— 319-397 not yet reported which blocks → VAN BUREN TEL. CO., INC. 1319 CANTRIL IA
— 319-398 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS 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.