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
2018-10-24 531-234 0XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → ONVOY, LLC - NE 549E NEWMAN GRV NE
2018-10-15 531-227 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - NE 549E CLARKSON NE
2018-10-05 531-226 0–9 XXXwhole prefix which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2018-09-25 531-225 0–9 XXXall 10 · 3 holders which blocks → AIRUS, INC. - NE 478H OMAHA NE
2018-08-24 531-206 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - NE 6263 AINSWORTH NE
2018-07-27 531-455 0XXX1XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NE 995E TALMAGE NE
2018-06-05 531-557 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9631 OMAHA NE
2018-04-27 531-223 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NE 549E HOWELLS NE
2018-04-20 531-414 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - NE 549E MADISON NE
2018-03-27 531-466 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D OMAHA NE
2018-03-07 531-484 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2018-03-05 531-389 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 OMAHA NE
2018-03-05 531-772 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J OMAHA NE
2018-02-22 531-277 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - NE 7144 OMAHA NE
2018-02-22 531-335 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WEST POINT NE
2018-01-12 531-519 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → N.E. COLORADO CELLULAR, INC. 6874 WAYNE NE
2017-12-21 531-216 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCHUYLER NE
2017-10-27 531-214 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - NE 549E PILGER NE
2017-08-22 531-233 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2017-08-16 531-219 0–9 XXXall 10 · 4 holders which blocks → AT&T - LOCAL 7421 FREMONT NE
2017-08-10 531-207 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LINCOLN NE
2017-08-10 531-459 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 UTICA NE
2017-04-07 531-259 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 BRISTOW NE
2017-03-24 531-218 0–9 XXXall 10 · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LINCOLN NE
2017-03-24 531-375 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 OMAHA NE
2017-03-09 531-888 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H O NEILL NE
2017-02-27 531-393 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OMAHA NE
2017-02-07 531-777 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2017-01-04 531-215 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H OMAHA NE
2016-11-09 531-204 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NE 549E NORFOLK NE
2016-06-22 531-220 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NE 995E LINCOLN NE
2016-05-10 531-210 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 OMAHA NE
2016-04-25 531-721 0–9 XXXall 10 · 3 holders which blocks → GREAT PLAINS BROADBAND, INC. - NE 012E OMAHA NE
2016-04-12 531-500 0–9 XXXall 10 · 4 holders which blocks → ALLO COMMUNICATIONS LLC 907K LINCOLN NE
2016-03-31 531-209 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 BLAIR NE
2016-03-24 531-571 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - NE 549E WAKEFIELD NE
2016-03-23 531-208 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NE 549E ATKINSON NE
2016-03-23 531-300 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → ONVOY, LLC - NE 549E CRESTON NE
2016-03-21 531-355 0–9 XXXwhole prefix which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J OMAHA NE
2016-02-18 531-222 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2016-01-28 531-212 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 OAKLAND NE
2015-12-24 531-224 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 AUBURN NE
2015-12-08 531-201 0–9 XXXwhole prefix which blocks → ONVOY, LLC - NE 549E OMAHA NE
2015-11-19 531-200 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2015-11-19 531-301 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2015-11-19 531-365 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - NE 549E OMAHA NE
2015-11-10 531-205 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 OMAHA NE
2015-10-19 531-329 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OMAHA NE
2015-10-15 531-727 0–9 XXXall 10 · 4 holders which blocks → GREAT PLAINS BROADBAND, INC. - NE 012E SEWARD NE
2015-08-27 531-309 0XXX1XXX2XXX3XXX5XXX6XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NE 995E EDGAR 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.