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 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
— 319-228 not yet reported which blocks → VAN HORNE COOP. TEL. CO. 1320 VAN HORNE IA
— 319-230 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WATERLOO IA
— 319-231 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 WATERLOO IA
— 319-232 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-233 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-234 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-235 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-236 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-239 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 WATERLOO IA
— 319-240 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 WATERLOO IA
— 319-246 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - IA 221F FT MADISON IA
— 319-247 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-248 not yet reported which blocks → PAETEC ITEL, LLC 829J IOWA CITY IA
— 319-253 2XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 HILLSBORO IA
— 319-254 3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 OLDS IA
— 319-256 not yet reported which blocks → FARMERS & MERCHANTS DBA KALON COOP TELE CO (KCTC) 1166 WAYLAND IA
— 319-257 0XXX2XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 WINFIELD IA
— 319-258 3XXX5XXX6XXX8XXX · 3 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 SALEM IA
— 319-261 8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CEDAR RPDS IA
— 319-265 9XXX which blocks → PAETEC ITEL, LLC 829J CEDAR RPDS IA
— 319-266 not yet reported which blocks → QWEST CORPORATION 9631 CEDARFALLS IA
— 319-267 not yet reported which blocks → DUMONT TEL. CO. 1152 ALLISON IA
— 319-268 not yet reported which blocks → QWEST CORPORATION 9631 CEDARFALLS IA
— 319-269 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 WATERLOO IA
— 319-270 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CEDAR RPDS IA
— 319-272 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-273 not yet reported which blocks → QWEST CORPORATION 9631 CEDARFALLS IA
— 319-274 9XXX which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-275 not yet reported which blocks → BUTLER-BREMER MUTUAL TEL. CO. 1115 FREDERIKA IA
— 319-276 not yet reported which blocks → BUTLER-BREMER MUTUAL TEL. CO. 1115 PLAINFIELD IA
— 319-277 not yet reported which blocks → QWEST CORPORATION 9631 CEDARFALLS IA
— 319-278 not yet reported which blocks → BUTLER-BREMER MUTUAL TEL. CO. 1115 CLARKSVL IA
— 319-279 not yet reported which blocks → READLYN TEL. CO. 1278 READLYN IA
— 319-283 0XXX8XXX which blocks → QWEST CORPORATION 9631 OELWEIN IA
— 319-284 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E OELWEIN IA
— 319-286 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-287 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-290 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 WATERLOO IA
— 319-291 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-292 not yet reported which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-293 not yet reported which blocks → VAN BUREN TEL. CO., INC. 1319 KEOSAUQUA IA
— 319-294 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-295 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-296 5XXX6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9631 WATERLOO IA
— 319-297 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-298 not yet reported which blocks → QWEST CORPORATION 9631 CEDAR RPDS IA
— 319-310 none assigned yet which blocks → UNITED STATES CELLULAR - IA 6266 CEDAR RPDS IA
— 319-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IA
— 319-313 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 KEOKUK IA
— 319-316 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LOCAL TELEPHONE DATA SERVICES CORP. 2842 FT MADISON 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.