NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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
— 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
— 309-472 none assigned yet which blocks → T-MOBILE USA, INC. 6529 PEORIA IL
— 309-473 0XXX1XXX5XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 HEYWORTH IL
— 309-475 1XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SAYBROOK IL
— 309-476 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ANDOVER IL
— 309-477 not yet reported which blocks → BRIGHTSPEED OF ILLINOIS, LLC 1057 PEKIN IL
— 309-478 not yet reported which blocks → BRIGHTSPEED OF ILLINOIS, LLC 1057 PEKIN IL
— 309-479 0XXX1XXX4XXX5XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CASTLETON IL
— 309-482 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ALEXIS IL
— 309-483 not yet reported which blocks → ONEIDA TEL. EXCH. 1066 ONEIDA IL
— 309-484 not yet reported which blocks → MID CENTURY TEL. COOP., INC. 1054 ALTONA IL
— 309-486 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 LONDON ML IL
— 309-493 8XXX which blocks → FRONTIER NORTH, INC. - IL 1015 CAMPGROVE IL
— 309-494 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 PEORIA IL
— 309-495 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 PEORIA IL
— 309-496 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 HAMPTON IL
— 309-497 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 PEORIA IL
— 309-507 4XXX6XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - IL 6265 GENESEO IL
— 309-510 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 PEORIA IL
— 309-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 309-517 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MOLINE IL
— 309-521 not yet reported which blocks → CAMBRIDGE TEL. CO. 0983 ANDOVER IL
— 309-522 not yet reported which blocks → CAMBRIDGE TEL. CO. 0983 OSCO IL
— 309-523 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 PORT BYRON IL
— 309-524 0–9 XXXall 10 · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 MOLINE IL
— 309-525 8XXX which blocks → UNITED STATES CELLULAR - IL 6265 KEWANEE IL
— 309-526 not yet reported which blocks → FRONTIER COMMUNICATIONS OF ORION, INC. 1067 ORION IL
— 309-527 not yet reported which blocks → CONSOLIDATED COMMUNICATIONS OF CENTRAL ILLINOIS 1004 EL PASO IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.