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
— 618-648 not yet reported which blocks → HAMILTON COUNTY TELEPHONE CO-OP 1024 BELLEPRARI IL
— 618-650 8XXX9XXX · 2 holders which blocks → ILLINOIS BELL TEL CO 9329 EDWARDSVL IL
— 618-651 4XXX5XXX6XXX7XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 HIGHLAND IL
— 618-652 3XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 VIENNA IL
— 618-653 2XXX3XXX5XXX6XXX8XXX · 3 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 KAMPSVILLE IL
— 618-654 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 HIGHLAND IL
— 618-655 3XXX4XXX5XXX8XXX · 4 holders which blocks → ILLINOIS BELL TEL CO 9329 EDWARDSVL IL
— 618-656 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 EDWARDSVL IL
— 618-657 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CYPRESS IL
— 618-658 0XXX which blocks → FRONTIER NORTH, INC. - IL 1015 VIENNA IL
— 618-659 5XXX7XXX · 2 holders which blocks → ILLINOIS BELL TEL CO 9329 EDWARDSVL IL
— 618-660 0XXX1XXX2XXX3XXX4XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLLINSVL IL
— 618-661 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 MCCLURE IL
— 618-662 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 FLORA IL
— 618-664 7XXX8XXX · 2 holders which blocks → ILLINOIS BELL TEL CO 9329 GREENVILLE IL
— 618-665 not yet reported which blocks → WABASH TEL. COOP., INC. 1088 LOUISVILLE IL
— 618-667 not yet reported which blocks → ILLINOIS BELL TEL CO 9329 TROY IL
— 618-669 0XXX1XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → FRONTIER COMMUNICATIONS-MIDLAND, INC. 1055 POCAHONTAS IL
— 618-670 2XXX which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-671 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVILLE IL
— 618-672 not yet reported which blocks → SHAWNEE TEL. CO. 1025 EDDYVILLE IL
— 618-673 not yet reported which blocks → WABASH TEL. COOP., INC. 1088 CISNE IL
— 618-675 not yet reported which blocks → ALHAMBRA-GRANTFORK TEL. CO. 0978 GRANTFORK IL
— 618-676 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CLAY CITY IL
— 618-677 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1036 FAYETTEVL IL
— 618-678 not yet reported which blocks → WABASH TEL. COOP., INC. 1088 XENIA IL
— 618-683 0XXX1XXX6XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 GOLCONDA IL
— 618-684 0XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MURPHYSBO IL
— 618-686 not yet reported which blocks → WABASH TEL. COOP., INC. 1088 BIBLEGROVE IL
— 618-687 0XXX6XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MURPHYSBO IL
— 618-689 0XXX1XXX2XXX4XXX6XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 SAILOR SPG IL
— 618-691 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLLINSVL IL
— 618-692 5XXX which blocks → ILLINOIS BELL TEL CO 9329 EDWARDSVL IL
— 618-695 not yet reported which blocks → SHAWNEE TEL. CO. 1025 SIMPSON IL
— 618-696 3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 COLLINSVL IL
— 618-700 not yet reported which blocks → IL
— 618-704 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 VANDALIA IL
— 618-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IL
— 618-723 0XXX3XXX4XXX5XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 NOBLE IL
— 618-724 0XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CHRISTOPHR IL
— 618-727 3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HERRIN IL
— 618-728 not yet reported which blocks → HAMILTON COUNTY TELEPHONE CO-OP 1024 MACEDONIA IL
— 618-729 5XXX6XXX7XXX which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 MEDORA IL
— 618-732 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 6 holders which blocks → ILLINOIS BELL TEL CO 9329 BLUFORD IL
— 618-734 3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → ILLINOIS BELL TEL CO 9329 CAIRO IL
— 618-735 not yet reported which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 WOODLAWN IL
— 618-736 not yet reported which blocks → HAMILTON COUNTY TELEPHONE CO-OP 1024 DAHLGREN IL
— 618-740 0–9 XXXall 10 · 7 holders which blocks → WABASH INDEPENDENT NETWORKS, INC DBA WABASH COMM 772H SALEM IL
— 618-742 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → ILLINOIS BELL TEL CO 9329 MOUND CITY IL
— 618-743 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 JOPPA 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.