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 815
ILLINOIS BELL TEL CO 157
FRONTIER NORTH, INC. - IL 133
LEVEL 3 COMMUNICATIONS, LLC - IL 76
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 50
AERO NORTH COMMUNICATIONS, INC. - IL 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
2025-05-16 815-612 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MOMENCE IL
2024-10-30 815-610 0XXX1XXX which blocks → ONVOY, LLC 224C HENNEPIN IL
2024-10-01 815-607 8XXX which blocks → ONVOY SPECTRUM, LLC 624H PEARL CITY IL
2024-09-30 815-815 1XXX2XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H LADD IL
2024-02-08 815-779 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PLAINFIELD IL
2022-10-11 815-763 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 JOLIET IL
2022-08-19 815-749 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E LOCKPORT IL
2019-11-21 815-892 0XXX1XXX2XXX6XXX · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 STILMANVLY IL
2019-11-20 815-296 0–9 XXXall 10 · 2 holders which blocks → TELNYX LLC 073H ROCKFORD IL
2019-09-30 815-859 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D ROCHELLE IL
2019-09-03 815-706 0–9 XXXall 10 · 3 holders which blocks → EXIANT COMMUNICATIONS LLC 114J ROCKFORD IL
2019-08-30 815-613 5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DIXON IL
2019-08-02 815-658 0XXX1XXX2XXX4XXX6XXX8XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 NEWARK IL
2019-07-31 815-604 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC 224C BELVIDERE IL
2019-02-18 815-655 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 COAL CITY IL
2018-10-31 815-620 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E MINOOKA IL
2018-08-01 815-551 0XXX1XXX2XXX5XXX6XXX · 2 holders which blocks → ONVOY, LLC 224C LANARK IL
2018-07-03 815-974 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → ONVOY, LLC 224C HEBRON IL
2016-01-08 815-755 0XXX1XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC 224C SENECA IL
2014-05-02 815-242 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E MINOOKA IL
2014-01-31 815-205 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J COAL CITY IL
2013-03-13 815-491 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 551G ROCKFORD IL
2013-03-11 815-329 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C ROCKFORD IL
2012-08-15 815-201 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E SHERIDAN IL
2010-12-22 815-300 0–9 XXXwhole prefix which blocks → ILLINOIS BELL TEL CO 9329 NEW LENOX IL
2010-10-18 815-240 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ROCK CUT IL
2010-08-04 815-900 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MCHENRY IL
2010-07-30 815-681 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 OGLESBY IL
2010-03-24 815-800 0–9 XXXall 10 · 6 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F POPLAR GRV IL
2010-03-23 815-884 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → MCC TELEPHONY LLC 593K EARLVILLE IL
2010-03-05 815-283 0–9 XXXall 10 · 4 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F WATERMAN IL
2010-03-05 815-860 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 ELWOOD IL
2010-02-15 815-400 1XXX3XXX6XXX7XXX · 4 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F MORRISON IL
2010-01-08 815-324 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY LLC 593K OTTAWA IL
2010-01-08 815-510 0–9 XXXall 10 · 6 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F STREATOR IL
2009-11-04 815-373 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J ELWOOD IL
2009-11-04 815-374 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J DWIGHT IL
2009-11-03 815-255 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J MINOOKA IL
2009-10-16 815-348 0–9 XXXall 10 · 7 holders which blocks → PAETEC ITEL, LLC 829J KANKAKEE IL
2009-06-10 815-995 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DE KALB IL
2009-04-28 815-320 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E NEW LENOX IL
2009-04-02 815-668 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C ROCKFORD IL
2008-12-15 815-312 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C ROCKFORD IL
2008-11-18 815-862 0–9 XXXall 10 · 7 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K RICHMOND IL
2008-05-13 815-746 not yet reported which blocks → MARSEILLES TEL. CO. OF MARSEILLES 1050 MARSEILLES IL
2008-04-08 815-202 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OGLESBY IL
2008-01-21 815-641 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 JOLIET IL
2007-04-24 815-270 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ROSCOE IL
2006-12-21 815-618 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FREEPORT IL
2006-11-27 815-888 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ROCHELLE IL

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.