NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

1 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, last 30 days — NPA 531
MIDSTATES DATA TRANSPORT, LLC - NE 1
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
2022-11-16 531-305 0XXX1XXX3XXX5XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 HICKMAN NE
2022-11-09 531-295 0XXX1XXX2XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 LAUREL NE
2022-11-09 531-302 0XXX1XXX2XXX3XXX5XXX8XXX · 4 holders which blocks → COMMIO, LLC 939H TECUMSEH NE
2022-09-23 531-290 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PILGER NE
2022-09-23 531-296 0XXX2XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CEDAR BLF NE
2022-09-23 531-297 8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAKEFIELD NE
2022-09-23 531-303 3XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 POLK NE
2022-09-23 531-312 0XXX1XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TAMORA NE
2022-09-23 531-338 0XXX2XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DAVID CITY NE
2022-09-23 531-441 0XXX1XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MEAD NE
2022-09-16 531-294 0XXX1XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 NEBRASKACY NE
2022-09-08 531-287 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - NE 6263 AUBURN NE
2022-09-08 531-293 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - NE 6263 SCHUYLER NE
2022-08-09 531-286 0XXX1XXX2XXX4XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OAKLAND NE
2022-08-04 531-288 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON NE
2022-06-27 531-285 0XXX1XXX2XXX · 3 holders which blocks → GLENWOOD TELECOMMUNICATIONS, INC. - NE 885E SHICKLEY NE
2022-06-10 531-270 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 OMAHA NE
2022-04-08 531-291 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 CRETE NE
2022-04-04 531-310 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H LINCOLN NE
2022-03-08 531-276 0XXX5XXX9XXX · 3 holders which blocks → ALLO COMMUNICATIONS LLC 907K MILFORD NE
2022-02-04 531-280 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LINCOLN NE
2022-02-01 531-273 0XXX1XXX2XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NE 995E DE WITT NE
2022-02-01 531-298 0XXX1XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NE 995E DORCHESTER NE
2022-01-27 531-264 0XXX1XXX2XXX3XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NE 995E FIRTH NE
2022-01-10 531-893 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J LINCOLN NE
2021-12-29 531-495 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J OMAHA NE
2021-12-23 531-281 0XXX1XXX8XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 TEKAMAH NE
2021-12-10 531-278 0–9 XXXall 10 · 2 holders which blocks → TELNYX LLC 073H LINCOLN NE
2021-11-22 531-282 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEATRICE NE
2021-11-02 531-279 9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 GENOA NE
2021-10-01 531-274 0–9 XXXall 10 · 3 holders which blocks → UNITED STATES CELLULAR - NE 6263 WAYNE NE
2021-08-24 531-271 0–9 XXXall 10 · 4 holders which blocks → UNITED STATES CELLULAR - NE 6263 O NEILL NE
2021-07-19 531-345 3XXX6XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H LINDSAY NE
2021-07-19 531-356 7XXX9XXX which blocks → FRACTEL, LLC 965H BUTTE NE
2021-06-23 531-322 0XXX2XXX3XXX4XXX · 2 holders which blocks → ONVOY, LLC - NE 549E CERESCO NE
2021-05-25 531-269 0–9 XXXall 10 · 6 holders which blocks → STRATUS NETWORKS 495J NORFOLK NE
2021-05-06 531-267 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J OMAHA NE
2021-05-03 531-268 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 ATKINSON NE
2021-04-29 531-776 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - NE 549E AINSWORTH NE
2021-04-28 531-265 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOSIOUX CY NE
2021-04-26 531-292 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 VALENTINE NE
2021-04-16 531-275 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - NE 6263 HOWELLS NE
2021-04-14 531-263 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 OMAHA NE
2021-04-13 531-810 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NE 549E LINCOLN NE
2021-04-13 531-910 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2021-04-08 531-262 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 OMAHA NE
2021-03-12 531-260 0XXX2XXX3XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEHAWKA NE
2021-03-12 531-261 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WEEPINGWTR NE
2021-03-10 531-258 2XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SO GREGORY NE
2021-03-08 531-257 0–9 XXXall 10 · 7 holders which blocks → ALLO COMMUNICATIONS LLC 907K VALENTINE NE

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.