NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 505
QWEST CORPORATION 184
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
— 505-764 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-765 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-766 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-767 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-768 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-771 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-792 6XXX which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-796 2XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-797 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-798 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-816 7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-820 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-821 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-822 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-823 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-827 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-828 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-830 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-831 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-832 3XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-833 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-836 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-837 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-839 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-841 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-842 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-843 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-844 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-845 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-846 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-847 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-848 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-850 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-851 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-853 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-855 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-856 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-857 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-858 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-861 9XXX which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-862 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 GALLUP NM
— 505-863 not yet reported which blocks → QWEST CORPORATION 9636 GALLUP NM
— 505-864 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-865 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-866 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-867 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-869 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-872 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-873 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-875 none assigned yet which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.