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 325
SOUTHWESTERN BELL 39
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
2002-10-21 325-866 0XXX1XXX2XXX3XXX6XXX7XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 SNYDER TX
2001-10-11 325-899 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
2001-03-14 325-936 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 ROSCOE TX
— 325-235 not yet reported which blocks → SOUTHWESTERN BELL 9533 SWEETWATER TX
— 325-236 0XXX1XXX2XXX3XXX4XXX which blocks → SOUTHWESTERN BELL 9533 SWEETWATER TX
— 325-303 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX TX
— 325-428 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-573 not yet reported which blocks → SOUTHWESTERN BELL 9533 SNYDER TX
— 325-574 0XXX3XXX4XXX5XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 SNYDER TX
— 325-576 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 HAMLIN TX
— 325-627 3XXX4XXX5XXX6XXX8XXX which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-644 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WESTBROOK TX
— 325-670 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-671 4XXX6XXX9XXX which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-672 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-673 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-674 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-675 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-676 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-677 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-690 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-691 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-692 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-695 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-696 9XXX which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-698 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-728 0XXX4XXX6XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 COLORADOCY TX
— 325-734 8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-735 0XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 ROTAN TX
— 325-738 0XXX1XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-762 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ALBANY TX
— 325-766 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 ROSCOE TX
— 325-773 0XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 STAMFORD TX
— 325-776 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 ROBY TX
— 325-793 not yet reported which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-794 6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-795 0XXX2XXX7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ABILENE TX
— 325-823 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 ANSON TX
— 325-863 0XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 HERMLEIGH TX

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.