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 810
ONVOY, LLCV - MI 23
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
2023-06-22 810-318 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C LAPEER MI
2023-06-22 810-319 2XXX which blocks → ONVOY, LLCV - MI 543C RANKIN MI
2023-06-22 810-382 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLCV - MI 543C FLINT MI
2021-07-02 810-500 0XXX2XXX3XXX5XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C HADLEY MI
2021-06-25 810-256 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLCV - MI 543C METAMORA MI
2021-06-16 810-273 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C GOODRICH MI
2021-06-16 810-283 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C JEDDO MI
2021-06-16 810-284 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C LAPEER MI
2021-06-16 810-286 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C NORTH BRCH MI
2021-06-16 810-314 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C PORT HURON MI
2021-05-19 810-440 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C CLIMTMORRS MI
2020-11-03 810-264 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C MEMPHIS MI
2020-10-23 810-261 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C RANKIN MI
2020-10-20 810-204 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C PORT HURON MI
2018-09-25 810-818 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C MONTROSE MI
2018-01-04 810-819 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C BRIGHTON MI
2017-10-06 810-666 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLCV - MI 543C FLINT MI
2016-02-25 810-206 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLCV - MI 543C BRIGHTON MI
2015-08-13 810-777 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLCV - MI 543C FLINT MI
2015-04-16 810-888 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLCV - MI 543C GOODELLS MI
2008-10-02 810-309 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLCV - MI 543C FLINT MI
— 810-815 9XXX which blocks → ONVOY, LLCV - MI 543C LEXINGTON MI
— 810-891 0XXX1XXX3XXX5XXX6XXX9XXX · 3 holders which blocks → ONVOY, LLCV - MI 543C SANDUSKY MI

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.