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 817
SOUTHWESTERN BELL 302
NEW CINGULAR WIRELESS PCS, LLC - IL 88
T-MOBILE USA, INC. 54
LEVEL 3 COMMUNICATIONS, LLC - TX 45
ONVOY, LLC - TX 43
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
2026-03-02 817-324 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2026-01-29 817-943 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
2026-01-29 817-982 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2026-01-07 817-828 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2025-11-05 817-331 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2025-11-05 817-981 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
2025-05-13 817-450 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J FORT WORTH TX
2024-06-10 817-971 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H FORT WORTH TX
2024-03-12 817-970 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H ARLINGTON TX
2024-03-12 817-973 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H FORT WORTH TX
2023-12-21 817-990 0–9 XXXwhole prefix which blocks → COMMIO, LLC 939H EULESS TX
2023-12-20 817-660 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H FORT WORTH TX
2023-12-20 817-951 0–9 XXXall 10 · 2 holders which blocks → COMMIO, LLC 939H KELLER TX
2023-12-20 817-954 0–9 XXXall 10 · 2 holders which blocks → COMMIO, LLC 939H GRAPEVINE TX
2023-10-31 817-940 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2023-08-22 817-325 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H ARLINGTON TX
2023-07-05 817-254 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H FORT WORTH TX
2023-05-22 817-214 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C FORT WORTH TX
2023-01-06 817-817 0–9 XXXall 10 · 2 holders which blocks → USFON, INC. - TX 473F FORT WORTH TX
2022-08-12 817-384 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H FORT WORTH TX
2022-08-09 817-661 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WEATHERFD TX
2022-07-08 817-670 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H ARLINGTON TX
2021-11-18 817-883 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
2018-03-08 817-936 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
2017-12-14 817-630 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
2014-11-14 817-513 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2012-10-10 817-818 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 WEATHERFD TX
2012-09-14 817-941 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
2011-08-24 817-617 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C ARLINGTON TX
2011-05-27 817-388 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 GRAPEVINE TX
2010-07-26 817-666 0–9 XXXall 10 · 7 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K CLEBURNE TX
2010-05-11 817-363 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FORT WORTH TX
2010-01-11 817-402 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 ALVARADO TX
2010-01-11 817-863 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2009-11-19 817-823 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2009-10-23 817-901 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WEATHERFD TX
2009-03-10 817-583 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2009-03-10 817-908 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARLINGTON TX
2008-11-13 817-751 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2008-04-21 817-760 0–9 XXXall 10 · 7 holders which blocks → SOUTHWESTERN BELL 9533 CLEBURNE TX
2008-04-15 817-802 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 ROANOKE TX
2008-03-26 817-470 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2008-02-29 817-659 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CLEBURNE TX
2008-01-07 817-471 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2007-11-27 817-600 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2007-10-16 817-876 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2007-09-06 817-948 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2007-08-28 817-960 0–9 XXXwhole prefix which blocks → SOUTHWESTERN BELL 9533 ARLINGTON TX
2007-02-23 817-682 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX
2007-02-23 817-888 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GLENDALE TX

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.