NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
— 817-651 not yet reported which blocks → SPOK, INC. 6630 ARLINGTON TX
— 817-652 not yet reported which blocks → SOUTHWESTERN BELL 9533 ARLINGTON TX
— 817-654 not yet reported which blocks → SOUTHWESTERN BELL 9533 GLENDALE TX
— 817-656 not yet reported which blocks → SOUTHWESTERN BELL 9533 NRICHLDHLS TX
— 817-657 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-658 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-662 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EULESS TX
— 817-663 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C NRICHLDHLS TX
— 817-664 0XXX3XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARLINGTON TX
— 817-665 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FORT WORTH TX
— 817-667 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ARLINGTON TX
— 817-668 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 SPRINGTOWN TX
— 817-669 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 ARLINGTON TX
— 817-671 not yet reported which blocks → SPOK, INC. 6630 ARLINGTON TX
— 817-672 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - TX 903C KENNEDALE TX
— 817-673 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ARLINGTON TX
— 817-674 5XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - TX 903C ROANOKE TX
— 817-676 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 ARLINGTON TX
— 817-677 0XXX1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2154 RENO TX
— 817-679 1XXX which blocks → SOUTHWESTERN BELL 9533 ARLINGTON TX
— 817-680 none assigned yet which blocks → METROPCS, INC. 5562 ARLINGTON TX
— 817-683 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-684 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-685 not yet reported which blocks → SOUTHWESTERN BELL 9533 EULESS TX
— 817-686 none assigned yet which blocks → ONVOY, LLC - TX 903C ATLAS TX
— 817-687 6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - TX 903C GLENDALE TX
— 817-688 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-689 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-690 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-691 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-692 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-695 5XXX which blocks → SOUTHWESTERN BELL 9533 ARLINGTON TX
— 817-696 0XXX1XXX3XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-698 not yet reported which blocks → SOUTHWESTERN BELL 9533 FORT WORTH TX
— 817-700 not yet reported which blocks → TX
— 817-701 4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - TX 903C ARLINGTON TX
— 817-703 not yet reported which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-704 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ARLINGTON TX
— 817-705 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-706 none assigned yet which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-707 none assigned yet which blocks → METROPCS, INC. 5562 ARLINGTON TX
— 817-708 2XXX which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 FORT WORTH TX
— 817-709 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GLENDALE TX
— 817-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX TX
— 817-712 not yet reported which blocks → LEVEL 3 OF TELECOM OF TEXAS, LLC - TX 7516 NRICHLDHLS TX
— 817-713 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
— 817-714 not yet reported which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-715 not yet reported which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
— 817-717 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 FORT WORTH TX
— 817-719 5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 ARLINGTON TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.