NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 618
FRONTIER NORTH, INC. - IL 126
ILLINOIS BELL TEL CO 111
NEW CINGULAR WIRELESS PCS, LLC - IL 95
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 62
LEVEL 3 COMMUNICATIONS, LLC - IL 46
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
2020-03-25 618-330 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E KAMPSVILLE IL
2020-03-25 618-348 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E HERRICK IL
2020-03-25 618-350 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E MARINE IL
2020-03-25 618-358 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E NEW BADEN IL
2020-03-24 618-280 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E ADDIEVILLE IL
2020-03-23 618-260 0XXX1XXX2XXX3XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E HOYLETON IL
2019-12-30 618-718 1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC 224C ALBION IL
2019-12-18 618-617 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C OLNEY IL
2019-12-09 618-209 1XXX2XXX · 2 holders which blocks → TELNYX LLC 073H GOLCONDA IL
2019-09-09 618-486 0XXX1XXX6XXX · 2 holders which blocks → VONAGE AMERICA LLC 197D LAWRENCEVL IL
2019-08-28 618-470 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 COLUMBIA IL
2019-04-26 618-577 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E BREESE IL
2018-12-04 618-626 0XXX1XXX2XXX3XXX6XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 DU QUOIN IL
2018-10-23 618-492 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C EDGEWOOD IL
2018-10-03 618-422 0–9 XXXall 10 · 6 holders which blocks → FUTIVA, LLC - IL 248J MARION IL
2018-08-01 618-668 0XXX1XXX2XXX6XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC 224C GOLCONDA IL
2018-04-20 618-640 0XXX1XXX9XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ST JACOB IL
2018-04-16 618-418 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL 7196 BELLEVILLE IL
2018-02-09 618-361 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PINCKNEYVL IL
2017-10-18 618-500 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C GRANITE CY IL
2017-10-02 618-900 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C COLLINSVL IL
2017-09-19 618-312 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WABASH INDEPENDENT NETWORKS, INC DBA WABASH COMM 772H SALEM IL
2017-06-01 618-217 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOOD RIVER IL
2017-03-27 618-484 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H COLLINSVL IL
2017-02-01 618-417 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 MT VERNON IL
2016-10-18 618-714 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - IL 1036 MASCOUTAH IL
2016-08-25 618-716 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC 224C TRENTON IL
2016-08-24 618-801 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C GRANITE CY IL
2016-08-24 618-804 0XXX1XXX2XXX4XXX6XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 LAWRENCEVL IL
2016-08-24 618-961 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC 224C GLENCARBON IL
2016-05-13 618-491 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C COLLINSVL IL
2016-05-05 618-517 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 OLNEY IL
2016-03-29 618-440 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 MARION IL
2016-03-24 618-852 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NEWTON IL
2016-01-11 618-706 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BATCHTOWN IL
2015-12-28 618-703 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GREENVILLE IL
2015-09-25 618-600 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C GRANITE CY IL
2015-09-24 618-666 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC 224C COLLINSVL IL
2015-09-16 618-800 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC 224C EDWARDSVL IL
2015-09-03 618-612 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RED BUD IL
2015-03-02 618-999 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C EDWARDSVL IL
2015-02-09 618-419 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 GRANITE CY IL
2014-11-21 618-619 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J ALTON IL
2014-09-04 618-290 0XXX which blocks → SHAWNEELEC, INC. 458H ROSICLARE IL
2014-07-07 618-515 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 E ST LOUIS IL
2014-07-07 618-701 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 HIGHLAND IL
2014-07-07 618-702 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 LEBANON IL
2014-06-26 618-481 0–9 XXXall 10 · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BRIGHTON IL
2014-06-23 618-414 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J TROY IL
2014-04-25 618-609 2XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 GRAYVILLE 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.