NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 351
ONVOY, LLC - MA 28
OMNIPOINT MIAMI E LICENSE, LLC 11
FRACTEL, LLC 11
MULTIPLE OCN LISTING 9
TON80 COMMUNICATIONS, LLC 7
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
2026-05-04 351-246 not yet reported which blocks → SHELCOMM 0051 SALEM MA
2025-03-04 351-351 0–9 XXXwhole prefix which blocks → MASS MOBILE LLC 125L LAWRENCE MA
2024-05-28 351-244 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 ACTON MA
2023-09-29 351-243 1XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 WESTFORD MA
2023-09-26 351-550 0XXX1XXX2XXX3XXX4XXX8XXX · 2 holders which blocks → COMMIO, LLC 939H CLINTON MA
2023-08-23 351-241 2XXX9XXX · 2 holders which blocks → ONVOY, LLC - MA 892D HAMILTON MA
2023-08-16 351-240 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MA 892D LAWRENCE MA
2023-06-05 351-242 0XXX1XXX2XXX3XXX5XXX8XXX · 3 holders which blocks → ONVOY, LLC - MA 892D FITCHBURG MA
2023-02-21 351-239 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 LOWELL MA
2023-02-08 351-238 0XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J ORANGE MA
2023-01-09 351-237 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 TEMPLETON MA
2023-01-04 351-236 0–9 XXXall 10 · 3 holders which blocks → IDT AMERICA, CORP. - MA 229C NEWBURYPT MA
2022-10-04 351-232 0XXX1XXX2XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MA 892D TYNGSBORO MA
2022-03-18 351-231 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 GLOUCESTER MA
2022-02-17 351-588 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J HAVERHILL MA
2022-02-16 351-233 0XXX1XXX2XXX3XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ASHBURNHAM MA
2022-02-16 351-266 0XXX1XXX6XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J PRINCETON MA
2022-02-16 351-426 0XXX1XXX3XXX4XXX8XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J DANVERS MA
2022-02-11 351-230 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 LEOMINSTER MA
2022-02-11 351-746 7XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WINCHENDON MA
2022-01-27 351-229 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E AMESBURY MA
2022-01-07 351-688 8XXX which blocks → TON80 COMMUNICATIONS, LLC 516J GEORGETOWN MA
2022-01-06 351-837 0XXX1XXX4XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ASHBY MA
2021-12-21 351-344 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - MA 892D GLOUCESTER MA
2021-12-21 351-377 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - MA 892D PEABODY MA
2021-12-20 351-350 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 IPSWICH MA
2021-12-03 351-220 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ACTON MA
2021-12-03 351-228 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E ANDOVER MA
2021-11-09 351-227 2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → ONVOY, LLC - MA 892D BOLTON MA
2021-10-22 351-667 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H ACTON MA
2021-09-17 351-221 0–9 XXXall 10 · 5 holders which blocks → COMMIO, LLC 939H LOWELL MA
2021-08-18 351-219 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J DANVERS MA
2021-07-23 351-234 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H HAVERHILL MA
2021-07-20 351-225 2XXX3XXX5XXX6XXX · 2 holders which blocks → ONVOY, LLC - MA 892D BERLIN MA
2021-07-16 351-224 1XXX2XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MA 892D BARRE MA
2021-06-14 351-223 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D BEVERLY MA
2021-06-14 351-252 1XXX2XXX3XXX5XXX6XXX · 3 holders which blocks → ONVOY, LLC - MA 892D ROWLEY MA
2021-04-26 351-345 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H HUDSON MA
2021-04-26 351-465 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → FRACTEL, LLC 965H MANCHESTER MA
2021-04-08 351-218 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ACTON MA
2021-04-01 351-251 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D GROTON MA
2021-04-01 351-253 2XXX3XXX4XXX5XXX · 2 holders which blocks → ONVOY, LLC - MA 892D ATHOLFKLN MA
2021-04-01 351-353 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D HAVERHILL MA
2021-04-01 351-354 0XXX1XXX3XXX5XXX · 3 holders which blocks → ONVOY, LLC - MA 892D LUNENBURG MA
2021-04-01 351-357 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MA 892D ORANGE MA
2021-04-01 351-358 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MA 892D PEPPERELL MA
2021-04-01 351-359 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLC - MA 892D SHIRLEY MA
2021-04-01 351-371 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - MA 892D WESTMINSTR MA
2021-03-17 351-352 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H GEORGETOWN MA
2021-03-17 351-355 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H AMESBURY MA

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.