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 323
PACIFIC BELL 265
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
— 323-566 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-567 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-568 0XXX1XXX6XXX7XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-569 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-575 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-581 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-582 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-583 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-584 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-585 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-586 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-587 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-588 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-589 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-600 3XXX4XXX5XXX7XXX · 2 holders which blocks → PACIFIC BELL 9740 LSAN DA 09 CA
— 323-604 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 LSAN DA 05 CA
— 323-605 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-619 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-634 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-636 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 LSAN DA 06 CA
— 323-643 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 LSAN DA 11 CA
— 323-644 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-650 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-651 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-653 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-654 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-655 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-656 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-658 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-660 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-661 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-662 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-663 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-664 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-665 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-666 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-667 4XXX5XXX6XXX7XXX8XXX which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-668 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-669 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-671 0XXX6XXX8XXX9XXX which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-674 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PACIFIC BELL 9740 LSAN DA 02 CA
— 323-678 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 09 CA
— 323-681 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PACIFIC BELL 9740 LSAN DA 03 CA
— 323-682 0XXX1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → PACIFIC BELL 9740 LSAN DA 03 CA
— 323-684 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 03 CA
— 323-685 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 05 CA
— 323-686 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PACIFIC BELL 9740 LSAN DA 04 CA
— 323-692 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-698 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-720 not yet reported which blocks → PACIFIC BELL 9740 MONTEBELLO CA

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.