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
2025-02-06 531-371 0XXX8XXX9XXX which blocks → ONVOY, LLC - NE 549E NORFOLK NE
2025-02-06 531-372 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2025-01-16 531-363 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 LINCOLN NE
2024-12-11 531-313 0XXX1XXX2XXX3XXX5XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HASTINGS NE
2024-09-03 531-370 0XXX1XXX3XXX5XXX7XXX · 5 holders which blocks → ALLO COMMUNICATIONS LLC 907K FREMONT NE
2024-06-11 531-369 0XXX1XXX2XXX3XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 SYRACUSE NE
2024-05-23 531-308 1XXX which blocks → TWC IP ENABLED SERVICES, LLC 793K MALCOLM NE
2024-05-20 531-367 0XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 RANDOLPH NE
2024-04-19 531-368 0XXX which blocks → ONVOY SPECTRUM, LLC 624H SHELBY NE
2024-03-26 531-366 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2024-03-06 531-364 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 GENEVA NE
2024-02-22 531-361 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NE 549E FREMONT NE
2024-02-22 531-362 0XXX1XXX2XXX3XXX5XXX8XXX · 6 holders which blocks → ONVOY, LLC - NE 549E BEATRICE NE
2024-02-14 531-359 0–9 XXXall 10 · 3 holders which blocks → ALLO COMMUNICATIONS LLC 907K OMAHA NE
2024-02-14 531-360 0XXX1XXX2XXX3XXX · 4 holders which blocks → ONVOY, LLC - NE 549E ALBION NE
2024-02-07 531-358 0XXX1XXX2XXX4XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 LOUISVILLE NE
2024-01-17 531-357 0XXX1XXX5XXX7XXX · 4 holders which blocks → COMMIO, LLC 939H AINSWORTH NE
2024-01-11 531-354 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 OMAHA NE
2024-01-09 531-352 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J OMAHA NE
2023-11-09 531-350 0–9 XXXall 10 · 3 holders which blocks → IP HORIZON LLC 515J LINCOLN NE
2023-10-31 531-349 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SOSIOUX CY NE
2023-10-23 531-348 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBUS NE
2023-10-20 531-346 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 OMAHA NE
2023-08-29 531-344 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 FREMONT NE
2023-08-22 531-343 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → COMMIO, LLC 939H CRESTON NE
2023-08-17 531-341 0XXX3XXX · 2 holders which blocks → ONVOY, LLC - NE 549E CARLETON NE
2023-08-17 531-342 0XXX3XXX · 2 holders which blocks → ONVOY, LLC - NE 549E ONG NE
2023-08-10 531-340 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → COMMIO, LLC 939H CLARKSON NE
2023-08-04 531-334 0XXX3XXX · 2 holders which blocks → ONVOY, LLC - NE 549E OHIOWA NE
2023-08-04 531-336 0XXX3XXX · 2 holders which blocks → ONVOY, LLC - NE 549E BENNET NE
2023-08-04 531-337 3XXX7XXX · 2 holders which blocks → ONVOY, LLC - NE 549E PLATTE CTR NE
2023-08-04 531-339 0XXX3XXX · 2 holders which blocks → ONVOY, LLC - NE 549E AVOCA NE
2023-06-27 531-328 0XXX1XXX2XXX3XXX4XXX8XXX · 5 holders which blocks → ONVOY, LLC - NE 549E FAIRBURY NE
2023-06-27 531-332 0XXX3XXX · 2 holders which blocks → ONVOY, LLC - NE 549E OSCEOLA NE
2023-06-23 531-327 0XXX3XXX · 2 holders which blocks → ONVOY, LLC - NE 549E WESTERN NE
2023-06-13 531-326 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 COLUMBUS NE
2023-05-31 531-325 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2023-04-20 531-324 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J LINCOLN NE
2023-04-12 531-317 0XXX1XXX3XXX5XXX · 3 holders which blocks → ONVOY, LLC - NE 549E HALLAM NE
2023-04-12 531-318 0XXX1XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - NE 549E WILBER NE
2023-04-12 531-319 0XXX1XXX2XXX · 2 holders which blocks → ONVOY, LLC - NE 549E DAVENPORT NE
2023-04-12 531-320 0XXX1XXX4XXX · 2 holders which blocks → ONVOY, LLC - NE 549E GRAFTON NE
2023-04-12 531-323 0XXX1XXX5XXX · 2 holders which blocks → ONVOY, LLC - NE 549E JULIAN NE
2023-03-14 531-316 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J HASTINGS NE
2023-03-07 531-330 0XXX1XXX3XXX5XXX · 4 holders which blocks → COMMIO, LLC 939H WAYNE NE
2023-01-18 531-315 0XXX2XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 BLAIR NE
2023-01-03 531-307 1XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 HOMER NE
2023-01-03 531-314 0XXX1XXX2XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 W HAMBURG NE
2022-12-14 531-306 0XXX1XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 MURRAY NE
2022-11-16 531-304 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PENDER 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.