NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

2 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
Clear Download CSV ↓
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 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.