NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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
FRONTIER NORTH, INC. - IL 114
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
— 217-590 0XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MAHOMET IL
— 217-593 0XXX2XXX3XXX4XXX5XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 CAMP POINT IL
— 217-624 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 LOAMI IL
— 217-625 0XXX1XXX6XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 PAWNEE IL
— 217-626 0XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 PLEASANTPL IL
— 217-627 0XXX1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 GIRARD IL
— 217-628 0XXX2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 DIVERNON IL
— 217-648 4XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ATLANTA 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
— 217-668 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
— 217-672 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
— 217-675 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 FRANKLIN 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
— 217-688 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SIDNEY IL
— 217-723 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MILTON 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
— 217-734 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
— 217-742 2XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 WINCHESTER IL
— 217-745 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 SIBLEY 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
— 217-754 4XXX5XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BLUFFS IL
— 217-759 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 BISMARCK 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
— 217-767 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ELWIN IL
— 217-773 0XXX1XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MTSTERLING IL
— 217-794 0XXX1XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MAROA IL
— 217-795 0XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ARGENTA IL
— 217-826 0XXX4XXX which blocks → FRONTIER NORTH, INC. - IL 1015 MARSHALL IL
— 217-829 2XXX3XXX5XXX8XXX · 2 holders which blocks → FRONTIER NORTH, INC. - IL 1015 PEARL IL
— 217-832 1XXX which blocks → FRONTIER NORTH, INC. - IL 1015 VILLAGROVE IL
— 217-833 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 GRIGGSVL IL
— 217-834 1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 BROADLANDS IL
— 217-837 1XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 NEWMAN IL
— 217-864 1XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MOUNT ZION IL
— 217-865 0XXX1XXX4XXX5XXX6XXX · 5 holders which blocks → FRONTIER NORTH, INC. - IL 1015 ELWIN IL
— 217-874 0XXX1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1015 DALTONCITY IL
— 217-882 0XXX1XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 MURRAYVL IL
— 217-884 0XXX1XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 REDMON IL
— 217-886 0XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1015 LITERBERRY IL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.