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
2021-03-17 351-361 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H ASHBY MA
2021-03-17 351-388 0XXX5XXX8XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H HARVARD MA
2021-03-17 351-501 2XXX4XXX5XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H HUBBARDSTN MA
2021-02-24 351-217 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 GLOUCESTER MA
2020-07-21 351-356 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H LEOMINSTER MA
2020-06-09 351-216 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAMILTON MA
2020-05-08 351-400 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H ESSEX MA
2020-05-08 351-500 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H LOWELL MA
2020-05-08 351-529 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H MERRIMAC MA
2020-05-08 351-600 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H PEABODY MA
2020-05-08 351-800 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H WINCHENDON MA
2020-05-08 351-900 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H IPSWICH MA
2019-11-29 351-215 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAVERHILL MA
2019-10-10 351-222 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D MERRIMAC MA
2019-10-10 351-300 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - MA 892D HARVARD MA
2019-10-08 351-214 0XXX1XXX2XXX3XXX4XXX9XXX · 3 holders which blocks → VONAGE AMERICA LLC 197D ROCKPORT MA
2019-05-16 351-203 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E TYNGSBORO MA
2019-04-04 351-212 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 DANVERS MA
2019-03-26 351-247 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 LUNENBURG MA
2019-02-21 351-209 0–9 XXXall 10 · 4 holders which blocks → EXIANT COMMUNICATIONS LLC 114J ACTON MA
2018-07-12 351-208 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 LOWELL MA
2018-06-25 351-204 0–9 XXXall 10 · 8 holders which blocks → METROPCS, INC. 5562 LAWRENCE MA
2018-05-15 351-200 0–9 XXXall 10 · 3 holders which blocks → TC SYSTEMS, INC. 7135 ASHBY MA
2017-09-26 351-666 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D PEABODY MA
2017-04-07 351-277 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 LAWRENCE MA
2017-03-13 351-322 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 LOWELL MA
2014-05-12 351-207 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J GEORGETOWN MA
2013-01-08 351-206 0XXX1XXX2XXX4XXX5XXX9XXX · 2 holders which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F ROCKPORT MA
2012-08-29 351-202 0–9 XXXwhole prefix which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F PEPPERELL MA
2012-08-29 351-205 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F GEORGETOWN MA
— 351-201 3XXX4XXX5XXX7XXX8XXX which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 DANVERS MA
— 351-210 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 HUDSON MA
— 351-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 351-213 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D TEMPLETON MA
— 351-226 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → FIVE9, INC. 598J WESTFORD MA
— 351-235 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ACTON MA
— 351-245 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 ACTON MA
— 351-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 351-333 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MA 892D HARVARD MA
— 351-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 351-444 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MA 892D IPSWICH MA
— 351-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 351-554 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 351-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MA
— 351-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 351-700 not yet reported which blocks → MA
— 351-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 351-777 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MA 892D HUBBARDSTN MA
— 351-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 351-814 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX 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.