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
— 505-333 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 AZTEC NM
— 505-334 not yet reported which blocks → QWEST CORPORATION 9636 AZTEC NM
— 505-341 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-342 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-343 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-344 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-345 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-352 4XXX which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-366 1XXX3XXX4XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-384 6XXX7XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-424 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-425 not yet reported which blocks → QWEST CORPORATION 9636 LAS VEGAS NM
— 505-426 3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 LAS VEGAS NM
— 505-428 0XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-438 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-449 7XXX8XXX which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-452 6XXX7XXX which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-454 not yet reported which blocks → QWEST CORPORATION 9636 LAS VEGAS NM
— 505-455 6XXX8XXX · 2 holders which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-462 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-465 4XXX7XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-466 5XXX which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-467 5XXX8XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-471 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-473 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-474 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-476 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-488 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 GALLUP NM
— 505-552 2XXX3XXX4XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-559 0XXX3XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-564 not yet reported which blocks → QWEST CORPORATION 9636 FARMINGTON NM
— 505-565 5XXX6XXX7XXX · 2 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-566 not yet reported which blocks → QWEST CORPORATION 9636 FARMINGTON NM
— 505-598 not yet reported which blocks → QWEST CORPORATION 9636 FARMINGTON NM
— 505-599 not yet reported which blocks → QWEST CORPORATION 9636 FARMINGTON NM
— 505-632 not yet reported which blocks → QWEST CORPORATION 9636 AZTEC NM
— 505-634 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → QWEST CORPORATION 9636 AZTEC NM
— 505-661 not yet reported which blocks → QWEST CORPORATION 9636 LOS ALAMOS NM
— 505-662 not yet reported which blocks → QWEST CORPORATION 9636 LOS ALAMOS NM
— 505-663 6XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 LOS ALAMOS NM
— 505-664 not yet reported which blocks → QWEST CORPORATION 9636 LOS ALAMOS NM
— 505-665 not yet reported which blocks → QWEST CORPORATION 9636 LOS ALAMOS NM
— 505-667 not yet reported which blocks → QWEST CORPORATION 9636 LOS ALAMOS NM
— 505-672 5XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9636 WHITE ROCK NM
— 505-721 0–9 XXXall 10 · 3 holders which blocks → QWEST CORPORATION 9636 GALLUP NM
— 505-722 not yet reported which blocks → QWEST CORPORATION 9636 GALLUP NM
— 505-724 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-726 3XXX4XXX · 2 holders which blocks → QWEST CORPORATION 9636 GALLUP NM
— 505-727 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-761 not yet reported 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.