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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 319-399 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-404 6XXX which blocks → UNITED STATES CELLULAR - IA 6266 WATERLOO IA
— 319-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 319-427 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WATERLOO IA
— 319-430 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 IOWA CITY IA
— 319-431 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CEDAR RPDS IA
— 319-433 5XXX8XXX which blocks → PAETEC ITEL, LLC 829J WATERLOO IA
— 319-434 not yet reported which blocks → SHELLSBURG CABLEVISION, INC. 4189 BELLEPLAIN IA
— 319-435 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9631 COGGON IA
— 319-436 not yet reported which blocks → FARMERS MUTUAL TEL. CO. 1173 SHELLSBURG IA
— 319-437 not yet reported which blocks → PRAIRIEBURG TEL. CO., INC. 1275 PRAIRIEBG IA
— 319-438 2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 CENTRAL CY IA
— 319-439 not yet reported which blocks → KEYSTONE FARMS COOP. TEL. CO. 1217 ELBERON IA
— 319-440 1XXX2XXX3XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
— 319-442 not yet reported which blocks → KEYSTONE FARMS COOP. TEL. CO. 1217 KEYSTONE IA
— 319-443 not yet reported which blocks → FARMERS MUTUAL TEL. CO. 1173 URBANA IA
— 319-444 0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 BELLEPLAIN IA
— 319-446 not yet reported which blocks → ATKINS TEL. CO., INC. 1101 ATKINS IA
— 319-447 7XXX which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-448 0XXX2XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 WALKER IA
— 319-450 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
— 319-453 not yet reported which blocks → FARMERS MUTUAL TEL. CO. 1173 SHELLSBURG IA
— 319-454 5XXX which blocks → SHELLSBURG CABLEVISION, INC. 1136 BLAIRSTOWN IA
— 319-455 6XXX7XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS 1170 LISBON IA
— 319-456 4XXX5XXX7XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 RICHLAND IA
— 319-457 not yet reported which blocks → T-MOBILE USA, INC. 6529 BURLINGTON IA
— 319-458 1XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WASHINGTON IA
— 319-460 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WASHINGTON IA
— 319-461 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 WASHINGTON IA
— 319-462 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9631 ANAMOSA IA
— 319-463 0XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 MONTROSE IA
— 319-464 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 WATERLOO 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
— 319-469 0XXX5XXX6XXX8XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 HOUGHTON IA
— 319-470 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 FT MADISON IA
— 319-471 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 IOWA CITY IA
— 319-472 0XXX1XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 VINTON IA
— 319-474 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 BRANDON IA
— 319-475 not yet reported which blocks → LA PORTE CITY TEL. CO. 1220 MT AUBURN IA
— 319-476 none assigned yet which blocks → FARMERS COOP. TEL. CO. 1162 DYSART IA
— 319-477 not yet reported which blocks → KEYSTONE FARMS COOP. TEL. CO. 1217 GARRISON IA
— 319-478 0XXX4XXX7XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 TRAER IA
— 319-479 not yet reported which blocks → FARMERS COOP. TEL. CO. 1162 CLUTIER IA
— 319-480 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 ANAMOSA IA
— 319-481 2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 ANAMOSA IA
— 319-482 not yet reported which blocks → MARTELLE COOP. TEL. ASSN. 1238 MARTELLE IA
— 319-483 0XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → QWEST CORPORATION 9631 WAVERLY IA
— 319-484 not yet reported which blocks → OLIN TEL. CO., INC. 1264 OLIN 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.