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 217
ILLINOIS BELL TEL CO 129
FRONTIER NORTH, INC. - IL 114
NEW CINGULAR WIRELESS PCS, LLC - IL 72
LEVEL 3 COMMUNICATIONS, LLC - IL 59
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 51
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
— 217-633 1XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H HARTSBURG IL
— 217-634 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ILLINOIS BELL TEL CO 9329 TALLULA IL
— 217-635 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 OAKFORD IL
— 217-636 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 ATHENS IL
— 217-637 9XXX which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-638 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD IL
— 217-639 not yet reported which blocks → ILLINOIS CONSOLIDATED TEL. CO. 1037 CHARLESTON IL
— 217-641 8XXX which blocks → PAETEC ITEL, LLC 829J QUINCY IL
— 217-642 0XXX2XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 HARTSBURG IL
— 217-643 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 THOMASBORO IL
— 217-644 not yet reported which blocks → ILLINOIS CONSOLIDATED TEL. CO. 1037 STRASBURG IL
— 217-645 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ILLINOIS BELL TEL CO 9329 LIBERTY IL
— 217-647 not yet reported which blocks → ADAMS TEL. COOP. 0976 MEYER IL
— 217-648 4XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ATLANTA IL
— 217-649 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHAMPAURBN IL
— 217-650 2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ATLANTA IL
— 217-652 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD IL
— 217-653 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 QUINCY IL
— 217-654 not yet reported which blocks → LAHARPE TEL. CO. 1043 FOUNTAGREN IL
— 217-655 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELNYX LLC 073H DANVILLE IL
— 217-656 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ILLINOIS BELL TEL CO 9329 PAYSON IL
— 217-658 2XXX5XXX6XXX7XXX · 4 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 SUTTER IL
— 217-659 not yet reported which blocks → LAHARPE TEL. CO. 1043 LA HARPE IL
— 217-660 0XXX1XXX4XXX7XXX8XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROCHESTER IL
— 217-662 0XXX1XXX3XXX5XXX7XXX9XXX · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 GEORGETOWN IL
— 217-663 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → METROPCS, INC. 5562 EFFINGHAM IL
— 217-664 4XXX6XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 DE LAND IL
— 217-665 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BETHANY IL
— 217-666 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 WEST DANA IL
— 217-667 not yet reported which blocks → ADAMS TEL. COOP. 0976 MINDALE IL
— 217-668 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 NIANTIC IL
— 217-669 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CISCO IL
— 217-671 2XXX3XXX4XXX5XXX6XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LINCOLN IL
— 217-672 0XXX1XXX2XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WARRENSBG IL
— 217-673 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WOODSON IL
— 217-674 2XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF MT. PULASKI, INC. 1061 LATHAM IL
— 217-675 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 FRANKLIN IL
— 217-676 not yet reported which blocks → ILLINOIS CONSOLIDATED TEL. CO. 1037 MT AUBURN IL
— 217-677 0XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 LA PLACE IL
— 217-678 1XXX6XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BEMENT IL
— 217-682 not yet reported which blocks → ILLINOIS CONSOLIDATED TEL. CO. 1037 STEWARDSON IL
— 217-683 not yet reported which blocks → MONTROSE MUTUAL TEL. CO. 1058 GILA IL
— 217-684 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 PHILO IL
— 217-685 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SPRINGFLD IL
— 217-687 0XXX1XXX3XXX5XXX7XXX8XXX · 4 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 SEYMOUR IL
— 217-688 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SIDNEY IL
— 217-689 2XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J CHAMPAURBN IL
— 217-690 2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EFFINGHAM IL
— 217-691 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD IL
— 217-692 not yet reported which blocks → ILLINOIS CONSOLIDATED TEL. CO. 1037 BLUE MOUND 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.