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
— 505-876 0XXX7XXX9XXX · 3 holders which blocks → QWEST CORPORATION 9636 GRANTS NM
— 505-877 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-878 none assigned yet which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-880 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-881 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-883 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-884 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-888 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-889 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-890 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-891 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-892 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-893 none assigned yet which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-896 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-897 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-898 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-899 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-922 5XXX which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-924 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-925 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-946 7XXX8XXX which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-954 1XXX which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-955 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-962 2XXX which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-966 3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-982 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-983 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-984 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-986 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-988 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-989 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-992 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE NM
— 505-994 not yet reported which blocks → QWEST CORPORATION 9636 ALBUQURQUE NM
— 505-995 not yet reported which blocks → QWEST CORPORATION 9636 SANTA FE 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.