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 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
2025-06-18 618-291 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARBONDALE IL
2025-06-18 618-784 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CARBONDALE IL
2023-08-22 618-991 0XXX1XXX2XXX3XXX · 4 holders which blocks → ONVOY, LLC 224C RAMSEY IL
2023-08-16 618-990 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C WOOD RIVER IL
2023-08-11 618-986 7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WATERLOO IL
2023-08-10 618-981 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 GRANITE CY IL
2023-08-08 618-618 0XXX1XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K DUBOIS IL
2023-07-31 618-730 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H OLNEY IL
2023-07-28 618-573 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVILLE IL
2023-07-26 618-970 0XXX2XXX3XXX · 3 holders which blocks → ONVOY, LLC 224C AVA IL
2023-07-18 618-953 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA IL
2023-07-18 618-957 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERRIN IL
2023-06-16 618-930 0XXX which blocks → COMMIO, LLC 939H CAIRO IL
2023-06-12 618-951 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERRIN IL
2023-05-03 618-941 1XXX which blocks → COMCAST IP PHONE, LLC 318J ALBION IL
2023-02-08 618-915 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 COLLINSVL IL
2023-02-08 618-916 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J HERRIN IL
2023-02-08 618-929 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 COLLINSVL IL
2023-01-11 618-909 1XXX7XXX8XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BREESE IL
2023-01-11 618-913 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERRIN IL
2022-12-08 618-812 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C IUKA IL
2022-12-08 618-903 0XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DORCHESTER IL
2022-12-08 618-904 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BALDWIN IL
2022-12-08 618-905 0XXX1XXX7XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 LEBANON IL
2022-12-08 618-906 0XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 DUPO IL
2022-12-08 618-907 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CENTRALIA IL
2022-12-08 618-908 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALTON IL
2022-12-08 618-914 0–9 XXXwhole prefix which blocks → ONVOY, LLC 224C KASKASKIA IL
2022-11-08 618-901 0–9 XXXall 10 · 2 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E CARBONDALE IL
2022-10-10 618-873 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E BELLEVILLE IL
2022-10-10 618-890 1XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J FREEBURG IL
2022-10-10 618-894 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GRAFTON IL
2022-09-09 618-864 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 HARRISBURG IL
2022-09-09 618-865 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LIVINGSTON IL
2022-09-09 618-868 8XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J PRAIRIETN IL
2022-09-09 618-870 0XXX1XXX7XXX8XXX9XXX · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BETHALTO IL
2022-08-09 618-856 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CENTRALIA IL
2022-08-09 618-858 0XXX1XXX7XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J AVISTON IL
2022-08-09 618-860 0XXX1XXX6XXX8XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J GERMANTOWN IL
2022-08-09 618-862 0XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J ST LIBORY IL
2022-05-09 618-848 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CENTRALIA IL
2022-05-09 618-849 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERRIN IL
2022-04-08 618-834 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 BRIGHTON IL
2022-04-08 618-840 0XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 STAUNTON IL
2022-03-08 618-831 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J EDWARDSVL IL
2022-03-08 618-886 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J TROY IL
2022-03-08 618-989 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WOOD RIVER IL
2022-03-01 618-404 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 HIGHLAND IL
2022-03-01 618-828 0XXX1XXX2XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 WESTVIEW IL
2022-03-01 618-832 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J JERSEYVL 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.