NumberResearch Membership · Data 09/24/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026

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 989
FRONTIER NORTH, INC. - MI 91
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
2015-04-23 989-409 4XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 ALMA MI
2006-05-02 989-331 0–9 XXXall 10 · 7 holders which blocks → FRONTIER NORTH, INC. - MI 0695 ALMA MI
2001-11-30 989-760 0XXX1XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 ALMA MI
2001-11-29 989-541 1XXX2XXX3XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 DURAND MI
2001-11-29 989-581 0–9 XXXall 10 · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 OVID MI
2001-11-29 989-675 0XXX1XXX2XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SIDNEY MI
2001-11-29 989-745 0–9 XXXall 10 · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 GRAYLING MI
2001-11-29 989-749 0XXX which blocks → FRONTIER NORTH, INC. - MI 0695 ELSIE MI
2001-11-29 989-783 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 ROSCOMMON MI
2001-11-29 989-813 0XXX1XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 HUBBARDSTN MI
2001-11-29 989-817 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MTPLEASANT MI
— 989-224 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 ST JOHNS MI
— 989-227 7XXX which blocks → FRONTIER NORTH, INC. - MI 0695 ST JOHNS MI
— 989-236 0XXX1XXX3XXX4XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MIDDLETON MI
— 989-248 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - MI 0695 FENWICK MI
— 989-268 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - MI 0695 VESTABURG MI
— 989-271 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → FRONTIER NORTH, INC. - MI 0695 GAINES MI
— 989-275 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 ROSCOMMON MI
— 989-288 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 DURAND MI
— 989-291 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SHERIDAN MI
— 989-328 0XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SIDNEY MI
— 989-344 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 GRAYLING MI
— 989-348 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 GRAYLING MI
— 989-352 0XXX2XXX3XXX4XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 LAKEVIEW MI
— 989-354 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 ALPENA MI
— 989-356 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 ALPENA MI
— 989-358 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 ALPENA MI
— 989-365 0XXX1XXX2XXX5XXX6XXX8XXX · 6 holders which blocks → FRONTIER NORTH, INC. - MI 0695 SIX LAKES MI
— 989-366 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 HOUGHTONLK MI
— 989-375 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 ELKTON MI
— 989-379 0XXX1XXX5XXX6XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 LACHINE MI
— 989-382 0XXX1XXX2XXX6XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 BARRYTON MI
— 989-422 0XXX1XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 HOUGHTONLK MI
— 989-427 4XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 EDMORE MI
— 989-463 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 ALMA MI
— 989-466 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 ALMA MI
— 989-471 0XXX1XXX6XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 OSSINEKE MI
— 989-479 1XXX2XXX4XXX7XXX8XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 HARBOR BCH MI
— 989-584 1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - MI 0695 CARSONCITY MI
— 989-593 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH, INC. - MI 0695 FOWLERPWMO MI
— 989-595 0XXX4XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 LONG LAKE MI
— 989-634 1XXX2XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 BANCROFT MI
— 989-637 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 PALO MI
— 989-642 0XXX1XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 HEMLOCK MI
— 989-643 1XXX3XXX4XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MERRILL MI
— 989-644 0XXX1XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 WEIDMAN MI
— 989-681 1XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC. - MI 0695 ST LOUIS MI
— 989-682 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 MAPLE RPD MI
— 989-683 0XXX1XXX4XXX7XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 KINGSTON MI
— 989-705 0XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC. - MI 0695 GAYLORD MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.