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 251
ONVOY SPECTRUM, LLC 17
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
2025-06-27 251-780 0XXX2XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H GROVE HILL AL
2021-11-16 251-374 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H MOBILE AL
2021-11-04 251-566 0XXX1XXX5XXX6XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H GOSPORT AL
2021-10-14 251-505 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H FRISCOCITY AL
2021-10-14 251-606 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H PINE APPLE AL
2021-09-01 251-364 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H JACKSON AL
2021-09-01 251-365 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H CITRONELLE AL
2021-09-01 251-372 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H BELLEFONTN AL
2021-07-27 251-860 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H HUXFORD AL
2021-07-27 251-870 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MONROEVL AL
2021-07-27 251-890 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H REPTON AL
2021-07-26 251-830 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H BEATRICE AL
2021-07-26 251-840 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H EXCEL AL
2021-07-23 251-820 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H ATMORE AL
2021-04-14 251-901 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MOBILE AL
2021-02-03 251-448 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MCCULLOUGH AL
2021-02-03 251-449 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H FINCHBURG AL

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.