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
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
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
2022-10-04 351-232 0XXX1XXX2XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MA 892D TYNGSBORO 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
2021-11-09 351-227 2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → ONVOY, LLC - MA 892D BOLTON 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
2021-04-01 351-251 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
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
2017-09-26 351-666 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D PEABODY MA
— 351-213 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D TEMPLETON MA
— 351-333 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MA 892D HARVARD MA
— 351-444 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - MA 892D IPSWICH MA
— 351-777 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - MA 892D HUBBARDSTN MA
— 351-888 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MA 892D MERRIMAC MA
— 351-999 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D MANCHESTER 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.