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
2026-03-19 319-587 0XXX1XXX8XXX · 2 holders which blocks → EXIANT COMMUNICATIONS LLC 114J CEDAR RPDS IA
2025-11-26 319-424 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 4 holders which blocks → WAVENATION, LLC 700J CEDAR RPDS IA
2025-09-04 319-554 0XXX1XXX4XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BRIGHTON IA
2025-09-03 319-510 0XXX1XXX2XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 BURLINGTON IA
2025-08-01 319-418 8XXX which blocks → HEART OF IOWA VENTURES, L.L.C. - IA 346F GRUNDY CTR IA
2025-04-03 319-701 1XXX2XXX8XXX · 3 holders which blocks → WIDE VOICE, LLC - IA 722G CEDAR RPDS IA
2025-03-31 319-990 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BRIGHTON IA
2025-03-03 319-503 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 5 holders which blocks → NUSO, LLC 478J CEDAR RPDS IA
2024-11-14 319-502 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 WATERLOO IA
2024-10-04 319-501 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BRIGHTON IA
2024-09-05 319-497 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CEDAR RPDS IA
2024-07-18 319-496 0XXX1XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MONTICELLO IA
2024-06-18 319-492 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - IA 221F IOWA CITY IA
2024-06-05 319-712 0XXX7XXX · 2 holders which blocks → ONVOY, LLC - IA 221F WALKER IA
2024-04-29 319-490 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - IA 221F CEDARFALLS IA
2024-03-28 319-487 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IA 221F CEDAR RPDS IA
2024-02-15 319-485 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J IOWA CITY IA
2024-02-06 319-710 3XXX6XXX7XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MTPLEASANT IA
2024-02-06 319-770 0XXX7XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H WEST POINT IA
2023-12-11 319-428 0–9 XXXall 10 · 2 holders which blocks → UNITED STATES CELLULAR - IA 6266 BURLINGTON IA
2023-12-05 319-515 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H CEDAR RPDS IA
2023-09-25 319-417 0XXX1XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 FT MADISON IA
2023-08-18 319-414 0XXX1XXX2XXX3XXX4XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2023-07-13 319-452 0XXX1XXX4XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 COLUMBSJCT IA
2023-06-29 319-420 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IA 221F WATERLOO IA
2023-06-29 319-468 0XXX1XXX2XXX3XXX4XXX7XXX · 4 holders which blocks → ONVOY, LLC - IA 221F INDEPNDNCE IA
2023-06-14 319-416 0XXX1XXX · 2 holders which blocks → NUSO, LLC 732J VINTON IA
2023-04-11 319-413 0XXX1XXX · 2 holders which blocks → ONVOY, LLC - IA 221F TROY MILLS IA
2023-04-10 319-402 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J IOWA CITY IA
2023-04-10 319-403 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CEDAR RPDS IA
2023-04-04 319-401 6XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IA 8344 TRIPOLI IA
2023-04-04 319-910 0XXX1XXX2XXX4XXX5XXX · 5 holders which blocks → COMMIO, LLC 939H PARKERSBG IA
2023-02-17 319-391 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J CEDAR RPDS IA
2023-01-24 319-307 4XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 DUNKERTON IA
2023-01-24 319-309 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 GUERNSEY IA
2023-01-24 319-314 5XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 READLYN IA
2022-11-28 319-719 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - IA 221F VINTON IA
2022-10-26 319-306 7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 JESUP IA
2022-10-18 319-451 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IA 985E CEDAR RPDS IA
2022-09-27 319-319 0–9 XXXwhole prefix which blocks → ONVOY, LLC - IA 221F IOWA CITY IA
2022-09-16 319-508 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 KEOSAUQUA IA
2022-07-27 319-340 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 WATERLOO IA
2022-03-25 319-776 3XXX6XXX7XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ROWLEY IA
2022-03-25 319-992 0XXX1XXX2XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J TIFFIN IA
2022-03-24 319-767 0XXX2XXX4XXX6XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J KEOKUK IA
2022-03-15 319-995 1XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WINFIELD IA
2022-03-14 319-566 1XXX5XXX6XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J RICHLAND IA
2022-03-14 319-922 1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SALEM IA
2022-03-10 319-733 0XXX1XXX3XXX7XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J FARMINGTON IA
2022-03-10 319-997 1XXX7XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J NEW LONDON 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.