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
— 217-693 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 CHAMPAURBN IL
— 217-694 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER COMMUNICATIONS OF THE CAROLINAS, INC - IL 1000 FLATVILLE IL
— 217-696 not yet reported which blocks → ADAMS TEL. COOP. 0976 GOLDEN IL
— 217-698 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
— 217-700 not yet reported which blocks → IL
— 217-701 0XXX1XXX7XXX which blocks → ONVOY, LLC 224C MANCHESTER IL
— 217-706 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DECATUR IL
— 217-709 4XXX7XXX which blocks → PAETEC ITEL, LLC 829J DANVILLE IL
— 217-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 217-719 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 JACKSONVL IL
— 217-720 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SPRINGFLD IL
— 217-721 2XXX6XXX8XXX which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-722 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CHAMPAURBN IL
— 217-723 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MILTON IL
— 217-725 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 SPRINGFLD IL
— 217-726 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
— 217-727 1XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GIBSONCITY IL
— 217-728 0XXX1XXX5XXX6XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SULLIVAN IL
— 217-732 none assigned yet which blocks → FRONTIER NORTH, INC. - IL 1015 LINCOLN IL
— 217-733 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ILLINOIS BELL TEL CO 9329 FAIRMOUNT IL
— 217-734 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 PLEASANTHL IL
— 217-735 0XXX which blocks → FRONTIER NORTH, INC. - IL 1015 LINCOLN IL
— 217-736 3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WELDON IL
— 217-737 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LINCOLN IL
— 217-738 not yet reported which blocks → ILLINOIS CONSOLIDATED TEL. CO. 1037 WESTERVELT IL
— 217-739 not yet reported which blocks → MONTROSE MUTUAL TEL. CO. 1058 ELLIOTTSTN IL
— 217-741 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPRINGFLD IL
— 217-742 2XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WINCHESTER IL
— 217-743 2XXX3XXX4XXX · 3 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 BASCO IL
— 217-744 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
— 217-745 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SIBLEY IL
— 217-746 0XXX1XXX4XXX6XXX7XXX · 4 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 FERRIS IL
— 217-747 3XXX which blocks → ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
— 217-748 1XXX3XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1036 ROSSVILLE IL
— 217-749 1XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ELLIOTT IL
— 217-750 1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LINCOLN IL
— 217-752 not yet reported which blocks → ILLINOIS CONSOLIDATED TEL. CO. 1037 GAYS IL
— 217-753 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
— 217-754 4XXX5XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BLUFFS IL
— 217-755 not yet reported which blocks → MCDONOUGH TEL. COOP. 1047 COLUSA IL
— 217-756 not yet reported which blocks → FRONTIER COMMUNICATIONS OF LAKESIDE, INC. 1011 FINDLAY IL
— 217-757 none assigned yet which blocks → ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
— 217-759 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 BISMARCK IL
— 217-761 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ILLINOIS BELL TEL CO 9329 SPRINGFLD IL
— 217-762 none assigned yet which blocks → FRONTIER NORTH, INC. - IL 1015 MONTICELLO IL
— 217-763 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CERROGORDO IL
— 217-764 2XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MACON IL
— 217-765 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1036 ALVIN IL
— 217-766 0XXX which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-767 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ELWIN 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.