NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
2001-09-28 256-410 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → POWERTEL BIRMINGHAM LICENSES, INC. 7475 MOULTON AL
2001-09-28 262-671 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 KENOSHA WI
2001-09-28 262-672 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 RACINE WI
2001-09-28 412-853 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PTTSBGZON1 PA
2001-09-28 414-326 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MILWAUKZN1 WI
2001-09-28 509-460 2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2001-09-28 509-741 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WENATCHEE WA
2001-09-28 602-299 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2001-09-28 602-348 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2001-09-28 661-717 2XXX3XXX5XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 BKFD MAIN CA
2001-09-28 678-978 0–9 XXXwhole prefix which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 GAINESVL GA
2001-09-28 707-385 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7174 HEALDSBURG CA
2001-09-28 707-709 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CALISTOGA CA
2001-09-28 707-861 0–9 XXXall 10 · 8 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7174 SEBASTOPOL CA
2001-09-28 720-495 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2001-09-28 734-731 6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MONROE MI
2001-09-28 813-793 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → AT&T - LOCAL 7421 TAMPAEST FL
2001-09-28 815-603 not yet reported which blocks → T-MOBILE USA, INC. 6529 JOLIET IL
2001-09-28 815-713 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROCKFORD IL
2001-09-28 815-802 6XXX which blocks → ILLINOIS BELL TEL CO 9329 KANKAKEE IL
2001-09-28 815-912 0XXX2XXX · 2 holders which blocks → AERO NORTH COMMUNICATIONS, INC. - IL 443F BELVIDERE IL
2001-09-28 865-268 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J MARYVILLE TN
2001-09-28 865-269 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J CLINTON TN
2001-09-28 951-847 2XXX3XXX7XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CORONA CA
2001-09-27 204-510 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Winnipeg —
2001-09-27 206-859 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
2001-09-27 253-345 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J TACOMAWVLY WA
2001-09-27 253-447 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - WA 483E SUMNER WA
2001-09-27 267-467 not yet reported which blocks → OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 PHPHSBZN33 PA
2001-09-27 339-927 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOBURN MA
2001-09-27 361-332 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → METROPCS, INC. 5562 ARANSSPASS TX
2001-09-27 361-437 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → METROPCS, INC. 5562 SINTON TX
2001-09-27 361-455 0XXX4XXX5XXX7XXX8XXX which blocks → STPCS JOINT VENTURE, LLC 4290 KINGSVILLE TX
2001-09-27 361-459 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 7 holders which blocks → STPCS JOINT VENTURE, LLC 4290 BISHOP TX
2001-09-27 361-463 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 ROCKPORT TX
2001-09-27 361-482 0XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → STPCS JOINT VENTURE, LLC 4290 PORTLAVACA TX
2001-09-27 361-492 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → METROPCS, INC. 5562 GEORGEWEST TX
2001-09-27 361-523 0XXX3XXX5XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 INGLESIDE TX
2001-09-27 361-534 0XXX2XXX3XXX5XXX7XXX8XXX · 4 holders which blocks → STPCS JOINT VENTURE, LLC 4290 TAFT TX
2001-09-27 361-562 0XXX2XXX4XXX5XXX7XXX8XXX which blocks → METROPCS, INC. 5562 ALICE TX
2001-09-27 361-633 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → METROPCS, INC. 5562 PORTLDGGRY TX
2001-09-27 361-683 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → METROPCS, INC. 5562 MATHIS TX
2001-09-27 361-726 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 ROBSTOWN TX
2001-09-27 361-738 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 7 holders which blocks → STPCS JOINT VENTURE, LLC 4290 ODEM TX
2001-09-27 409-779 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ORANGE TX
2001-09-27 417-773 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD MO
2001-09-27 484-400 not yet reported which blocks → LIMITLESS MOBILE, LLC 6921 READING PA
2001-09-27 514-294 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Montreal —
2001-09-27 514-295 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Montreal —
2001-09-27 570-216 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MT POCONO PA

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.