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 641
WINDSTREAM IOWA COMMUNICATIONS, INC. 60
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 46
UNITED STATES CELLULAR - IA 39
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 32
QWEST CORPORATION 30
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
2024-03-08 641-310 0XXX1XXX2XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - IA 221F MARSHALLTN IA
2024-03-04 641-403 8XXX which blocks → AUREON COMMUNICATIONS, LLC 444G BAGLEY IA
2024-03-04 641-407 8XXX which blocks → AUREON COMMUNICATIONS, LLC 444G LINDEN IA
2024-02-09 641-714 4XXX which blocks → ONVOY SPECTRUM, LLC 624H LE GRAND IA
2024-01-22 641-263 1XXX2XXX3XXX · 3 holders which blocks → AUREON COMMUNICATIONS, LLC 444G MORAVIA IA
2023-11-27 641-256 0XXX1XXX2XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CRESTON IA
2023-10-25 641-303 1XXX3XXX · 2 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F STATE CTR IA
2023-09-13 641-359 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → COMMIO, LLC 939H IOWA FALLS IA
2023-05-11 641-302 0XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J RHODES IA
2022-12-15 641-250 0XXX1XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 MANLY IA
2022-12-15 641-254 0XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 NASHUA IA
2022-07-29 641-290 2XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MILO IA
2022-07-28 641-268 1XXX2XXX · 2 holders which blocks → AUREON COMMUNICATIONS, LLC 444G LACONA IA
2022-04-28 641-255 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 MASON CITY IA
2022-04-28 641-261 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TOLEDO IA
2022-03-25 641-776 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CHARITON IA
2022-03-14 641-668 4XXX6XXX8XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BUSSEY IA
2022-03-10 641-272 2XXX7XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BRIDGEWTR IA
2022-03-04 641-727 2XXX3XXX7XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BLAKESBURG IA
2022-02-28 641-543 3XXX4XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ALTA VISTA IA
2022-02-28 641-966 2XXX6XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BLADENSBG IA
2022-02-24 641-837 1XXX4XXX8XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ALBIA IA
2022-02-22 641-253 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRISTOW IA
2022-02-22 641-514 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 THOMPSON IA
2022-02-21 641-258 2XXX3XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ADAIR IA
2022-02-21 641-266 1XXX2XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ACKLEY IA
2022-01-26 641-508 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 OSCEOLA IA
2022-01-13 641-517 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 OSKALOOSA IA
2021-12-08 641-341 4XXX which blocks → ONVOY, LLC - IA 221F THORNTON IA
2021-12-03 641-252 2XXX4XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DUMONT IA
2021-12-03 641-506 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ZEARING IA
2021-12-03 641-916 6XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ST CHARLES IA
2021-07-22 641-240 0XXX2XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UNIONVILLE IA
2021-07-19 641-246 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NORA SPG IA
2021-07-19 641-249 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LINEVILLE IA
2021-07-19 641-719 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEMONS IA
2021-05-27 641-282 2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTHADAMS IA
2021-05-25 641-241 0XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FONTANELLE IA
2021-05-25 641-245 0XXX2XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PRESCOTT IA
2021-05-25 641-248 2XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OLLIE IA
2021-05-25 641-288 2XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AMUND IA
2021-05-25 641-382 2XXX3XXX4XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BAILEY IA
2021-04-27 641-796 0–9 XXXall 10 · 2 holders which blocks → REASNOR TELEPHONE COMPANY, LLC 739D REASNOR IA
2021-04-13 641-643 0XXX2XXX3XXX4XXX6XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MALCOM IA
2021-03-03 641-239 2XXX4XXX5XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 AFTON IA
2021-01-21 641-516 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 MARSHALLTN IA
2020-12-09 641-281 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → STRATUS NETWORKS 495J CHARLES CY IA
2020-10-09 641-219 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 CHARITON IA
2020-09-23 641-619 0XXX1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → IMON COMMUNICATIONS, LLC - IA 695G PELLA IA
2020-09-21 641-274 2XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LOVILIA 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.