NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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 — NPA 309
ONVOY, LLC 1
AHOI LLC 1
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
2020-06-26 309-615 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J PEORIA IL
2020-05-06 309-614 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SMITHFIELD IL
2020-04-29 309-612 0–9 XXXall 10 · 4 holders which blocks → CSC WIRELESS, LLC 425J BLOOMINGTN IL
2020-03-18 309-608 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E SAN JOSE IL
2020-03-12 309-604 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 FARMINGTON IL
2020-03-03 309-570 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J PEORIA IL
2020-02-24 309-903 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC 224C ROCKISLAND IL
2020-02-10 309-561 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PEORIA IL
2020-02-06 309-560 0XXX1XXX3XXX5XXX6XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 COLFAX IL
2019-12-17 309-549 1XXX which blocks → TELNYX LLC 073H GALESBURG IL
2019-12-12 309-459 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BLOOMINGTN IL
2019-12-10 309-239 0–9 XXXall 10 · 6 holders which blocks → TELNYX LLC 073H BLOOMINGTN IL
2019-11-04 309-844 0XXX1XXX4XXX8XXX9XXX · 3 holders which blocks → COMMIO, LLC 939H PEORIA IL
2019-10-30 309-391 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E BLOOMINGTN IL
2019-10-23 309-810 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H PEORIA IL
2019-09-30 309-381 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D GALESBURG IL
2019-05-10 309-355 1XXX5XXX · 2 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F GRIDLEY IL
2019-02-26 309-877 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → TERRA NOVA TELECOM INC. 145J PEORIA IL
2019-01-25 309-666 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H PEORIA IL
2019-01-04 309-520 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2019-01-04 309-553 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2018-11-15 309-590 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C BLOOMINGTN IL
2018-10-10 309-519 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROCKISLAND IL
2018-10-04 309-506 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2018-09-21 309-650 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C PEKIN IL
2018-09-21 309-780 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC 224C TALBOTT IL
2018-09-21 309-790 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C TOPEKA IL
2018-09-20 309-610 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C FORESTCITY IL
2018-09-20 309-640 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC 224C HAVANA IL
2018-08-01 309-332 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D STANFORD IL
2018-06-12 309-350 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ROCKISLAND IL
2018-03-22 309-328 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E NORTHPEKIN IL
2018-03-13 309-327 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D PEORIA IL
2018-02-23 309-324 0–9 XXXall 10 · 5 holders which blocks → EXIANT COMMUNICATIONS LLC 114J PEORIA IL
2017-12-06 309-322 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E PEORIA IL
2017-11-14 309-317 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROCKISLAND IL
2017-09-21 309-271 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C PEORIA IL
2017-09-01 309-204 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E SPRING BAY IL
2017-03-20 309-316 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C DELAVAN IL
2017-03-13 309-869 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELNYX LLC 073H LEWISTOWN IL
2017-02-23 309-592 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ROCKISLAND IL
2017-01-10 309-233 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 MANITO IL
2016-12-13 309-571 0–9 XXXall 10 · 2 holders which blocks → TELNYX LLC 073H PEORIA IL
2016-10-28 309-513 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 ALEDO IL
2016-08-04 309-516 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J KILBOURNE IL
2016-08-04 309-605 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BATH IL
2016-05-11 309-512 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PEORIA IL
2016-05-09 309-954 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MACOMB IL
2015-11-17 309-541 0XXX1XXX3XXX5XXX6XXX · 3 holders which blocks → ONVOY, LLC 224C GALESBURG IL
2015-09-03 309-998 not yet reported which blocks → CENTURY ENTERPRISES, INC. - IL 455H CANTON 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.