NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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, last 30 days
8X8, INC. 39
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 15
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
— 712-353 0XXX7XXX · 2 holders which blocks → WESTERN IOWA TEL. ASSN. 1334 CASTANA IA
— 712-358 4XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 HAVELOCK IA
— 712-359 not yet reported which blocks → PALMER MUTUAL TEL. CO. 1270 PALMER IA
— 712-362 0XXX1XXX · 2 holders which blocks → QWEST CORPORATION 9631 ESTHERVL IA
— 712-363 8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 SPENCER IA
— 712-364 1XXX5XXX6XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 IDA GROVE IA
— 712-365 not yet reported which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 BATTLE CRK IA
— 712-366 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-367 not yet reported which blocks → SAC COUNTY MUTUAL TEL. CO. 1285 ARTHUR IA
— 712-368 1XXX3XXX5XXX6XXX7XXX · 5 holders which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 HOLSTEIN IA
— 712-369 2XXX4XXX · 2 holders which blocks → TELNYX LLC 073H IDA GROVE IA
— 712-370 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 RED OAK IA
— 712-371 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 IDA GROVE 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
— 712-374 0XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 SIDNEY IA
— 712-375 not yet reported which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 PIERSON IA
— 712-376 not yet reported which blocks → WEST IOWA TEL. CO. 1331 MARCUS IA
— 712-378 5XXX6XXX8XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF IOWA, INC. 1127 KINGSLEY IA
— 712-379 not yet reported which blocks → FARMERS TEL. CO. 1176 ESSEX IA
— 712-380 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → UNITED STATES CELLULAR - IA 6266 ESTHERVL IA
— 712-382 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9631 HAMBURG IA
— 712-384 not yet reported which blocks → SCHALLER TEL. CO. 1291 CUSHING IA
— 712-385 not yet reported which blocks → PRAIRIE TEL. CO., INC. 1344 FARRAGUT IA
— 712-386 not yet reported which blocks → SOUTHWEST TEL. EXCH., INC. 1301 IMOGENE IA
— 712-387 4XXX7XXX8XXX which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 RIVERTON IA
— 712-388 not yet reported which blocks → QWEST CORPORATION 9631 COUNCILBLF IA
— 712-389 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → AT&T - LOCAL 7421 SIOUX CITY IA
— 712-390 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 SIOUX RPD IA
— 712-393 not yet reported which blocks → BTC, INC. - IA 156C DENISON IA
— 712-402 not yet reported which blocks → IA
— 712-403 0XXX1XXX2XXX3XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - IA 221F SHELDON IA
— 712-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 712-420 7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 ONAWA IA
— 712-423 0XXX4XXX5XXX6XXX · 3 holders which blocks → QWEST CORPORATION 9631 ONAWA IA
— 712-424 0XXX2XXX4XXX7XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CYLINDER IA
— 712-425 0XXX2XXX4XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MALLARD IA
— 712-426 not yet reported which blocks → AYRSHIRE FARMERS MUTUAL TEL. CO. 1105 AYRSHIRE IA
— 712-428 not yet reported which blocks → NORTHWEST IOWA TELEPHONE, LLC 1260 SLOAN IA
— 712-431 4XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 ONAWA IA
— 712-433 not yet reported which blocks → COMMCHOICE OF IOWA, LLC 4092 ONAWA IA
— 712-434 not yet reported which blocks → PEOPLES TEL. CO. 1273 AURELIA IA
— 712-436 not yet reported which blocks → C-M-L TEL. COOP. ASSN. OF MERIDEN IOWA 1133 CLEGHORN IA
— 712-437 not yet reported which blocks → C-M-L TEL. COOP. ASSN. OF MERIDEN IOWA 1133 LARRABEE IA
— 712-438 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CLARINDA IA
— 712-439 6XXX which blocks → HEARTLAND TELECO OF IA DBA PREMIER COMMUNICATIONS 1109 HULL IA
— 712-441 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SIOUX CTR IA
— 712-443 not yet reported which blocks → C-M-L TEL. COOP. ASSN. OF MERIDEN IOWA 1133 MERIDEN IA
— 712-445 not yet reported which blocks → WEST IOWA TEL. CO. 1331 QUIMBY IA
— 712-446 not yet reported which blocks → WEST IOWA TEL. CO. 1331 SUTHERLAND IA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.