NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

337 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 25
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 12
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
— 309-406 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-407 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-408 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-409 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-410 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 309-412 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-413 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-414 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-415 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-416 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-417 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-418 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-419 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-420 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-422 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-423 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-424 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 PEORIA IL
— 309-426 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ROSEVILLE IL
— 309-427 0XXX8XXX9XXX · 2 holders which blocks → ILLINOIS BELL TEL CO 9329 PEORIA IL
— 309-431 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-432 0XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MINONK IL
— 309-433 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J BLOOMINGTN IL
— 309-434 0XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-436 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-437 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-438 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-439 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEORIA IL
— 309-441 not yet reported which blocks → GENESEO TEL. CO. 1016 GREENRIVER IL
— 309-443 0XXX2XXX3XXX4XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 LOW POINT IL
— 309-444 0XXX6XXX which blocks → FRONTIER NORTH, INC. - IL 1015 WASHINGTON IL
— 309-446 1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BRIMFIELD IL
— 309-447 0XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 DEER CREEK IL
— 309-448 3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 CONGERVL IL
— 309-449 0XXX1XXX2XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 HOPEDALE IL
— 309-451 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-452 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-453 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
— 309-454 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 BLOOMINGTN IL
— 309-456 not yet reported which blocks → MCDONOUGH TEL. COOP. 1047 GOOD HOPE IL
— 309-457 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 MONMOUTH IL
— 309-458 not yet reported which blocks → ADAMS TEL. COOP. 0976 PLYMOUTH IL
— 309-462 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ABINGDON IL
— 309-463 0XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 VARNA IL
— 309-464 2XXX3XXX4XXX · 2 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 NOHENDERSN IL
— 309-465 not yet reported which blocks → BRIGHTSPEED OF ILLINOIS, LLC 1057 AVON IL
— 309-467 1XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 EUREKA IL
— 309-469 0XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SPARLAND IL
— 309-470 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 PEORIA IL
— 309-471 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC 224C SPARLAND IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.