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
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
— 618-564 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BROOKPORT IL
— 618-565 0XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MURPHYSBO IL
— 618-566 0XXX1XXX6XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1036 MASCOUTAH IL
— 618-568 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ELKVILLE IL
— 618-569 0XXX1XXX6XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1036 ANNAPOLIS IL
— 618-586 1XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 PALESTINE IL
— 618-587 0XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 TILDEN IL
— 618-588 0XXX1XXX5XXX6XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 NEW BADEN IL
— 618-596 0XXX1XXX3XXX5XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ZEIGLER IL
— 618-625 0XXX1XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SESSER IL
— 618-627 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - IL 1015 THOMPSONVL IL
— 618-629 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 EWING IL
— 618-634 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 KARNAK IL
— 618-643 0XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MCLEANSBO IL
— 618-651 4XXX5XXX6XXX7XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 HIGHLAND IL
— 618-654 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 HIGHLAND 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
— 618-662 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 FLORA 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
— 618-683 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
— 618-687 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
— 618-723 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
— 618-743 not yet reported which blocks → FRONTIER NORTH, INC. - IL 1015 JOPPA IL
— 618-752 0XXX1XXX4XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1036 WENDELIN IL
— 618-754 0XXX1XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1036 DUNDAS IL
— 618-758 4XXX5XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 COULTERVL IL
— 618-777 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 STONEFORT IL
— 618-783 1XXX7XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 NEWTON IL
— 618-793 0XXX3XXX4XXX7XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ROSE HILL IL
— 618-826 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CHESTER IL
— 618-827 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 DONGOLA IL
— 618-833 0XXX which blocks → FRONTIER NORTH, INC. - IL 1015 ANNA IL
— 618-842 8XXX which blocks → FRONTIER NORTH, INC. - IL 1015 FAIRFIELD IL
— 618-845 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ULLIN IL
— 618-847 0XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 FAIRFIELD IL
— 618-853 1XXX3XXX5XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 EVANSVILLE IL
— 618-859 7XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ELLISGROVE IL
— 618-863 0XXX1XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 CALHOUN IL
— 618-867 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 DE SOTO IL
— 618-869 0XXX3XXX6XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CLAREMONT IL
— 618-884 0XXX3XXX4XXX5XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WESTPORT IL
— 618-893 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 COBDEN IL
— 618-895 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WAYNE CITY IL
— 618-896 0XXX3XXX4XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BURNTPRARI IL
— 618-928 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 BIRDS 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.