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
METROPCS NETWORKS, LLC 85
T-MOBILE USA, INC. 64
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 45
NEW CINGULAR WIRELESS PCS, LLC 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
— 323-645 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 14 CA
— 323-647 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 05 CA
— 323-648 1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J LSAN DA 13 CA
— 323-649 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 11 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
— 323-657 2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 08 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
— 323-675 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 03 CA
— 323-677 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 13 CA
— 323-678 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 09 CA
— 323-679 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - CA 649C 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
— 323-683 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 09 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
— 323-691 none assigned yet which blocks → METROPCS NETWORKS, LLC 899D MONTEBELLO CA
— 323-692 not yet reported which blocks → PACIFIC BELL 9740 LSAN DA 13 CA
— 323-693 3XXX4XXX6XXX · 2 holders which blocks → ONVOY, LLC - CA 649C MONTEBELLO CA
— 323-696 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 09 CA
— 323-698 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PACIFIC BELL 9740 LSAN DA 14 CA
— 323-699 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 LSAN DA 08 CA
— 323-700 not yet reported which blocks → CA
— 323-704 3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → IP HORIZON LLC 515J LSAN DA 05 CA
— 323-709 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 11 CA
— 323-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 323-717 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 09 CA
— 323-720 not yet reported which blocks → PACIFIC BELL 9740 MONTEBELLO CA
— 323-721 not yet reported which blocks → PACIFIC BELL 9740 MONTEBELLO CA
— 323-722 not yet reported which blocks → PACIFIC BELL 9740 MONTEBELLO CA
— 323-723 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PACIFIC BELL 9740 LSAN DA 05 CA
— 323-724 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.