NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 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, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
— 231-869 1XXX3XXX · 2 holders which blocks → FRONTIER NORTH, INC. - MI 0695 PENTWATER MI
— 231-871 1XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BEULAH MI
— 231-872 2XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REED CITY MI
— 231-873 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 HART MI
— 231-875 6XXX which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E FRUITPORT MI
— 231-876 8XXX which blocks → MICHIGAN BELL TEL CO 9323 CADILLAC MI
— 231-877 not yet reported which blocks → 123.NET, LLC 2550 NORTHPORT MI
— 231-879 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MICHIGAN BELL TEL CO 9323 FIFE LAKE MI
— 231-881 8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PETOSKEY MI
— 231-882 6XXX which blocks → MICHIGAN BELL TEL CO 9323 BEULAH MI
— 231-883 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
— 231-884 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
— 231-885 7XXX which blocks → ACE TEL. CO. OF MICHIGAN, INC. 0704 MESICK MI
— 231-886 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KALKASKA MI
— 231-887 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANISTEE MI
— 231-889 1XXX2XXX6XXX7XXX8XXX · 5 holders which blocks → MICHIGAN BELL TEL CO 9323 ONEKAMA MI
— 231-890 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-893 not yet reported which blocks → FRONTIER NORTH, INC. - MI 0695 WHITEHALL MI
— 231-894 0XXX which blocks → FRONTIER NORTH, INC. - MI 0695 WHITEHALL MI
— 231-898 7XXX which blocks → CARR TEL. CO. 0683 CARR MI
— 231-906 not yet reported which blocks → MI
— 231-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
— 231-920 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CADILLAC MI
— 231-922 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-924 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 FREMONT MI
— 231-928 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MICHIGAN BELL TEL CO 9323 FREMONT MI
— 231-929 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-932 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-933 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-935 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-937 0XXX1XXX2XXX3XXX · 4 holders which blocks → FRONTIER NORTH, INC. - MI 0695 HOWARDCITY MI
— 231-938 6XXX which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-941 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-943 1XXX2XXX6XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-944 0–9 XXXall 10 · 3 holders which blocks → CYNERGYCOMM.NET, INC. - MI 9245 TRAVERSECY MI
— 231-946 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-947 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 231-950 not yet reported which blocks → MI
— 231-955 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
— 231-958 not yet reported which blocks → MI
— 231-959 not yet reported which blocks → MI
— 231-972 not yet reported which blocks → BRIGHTSPEED OF CENTRAL MICHIGAN, INC 0671 MECOSTA MI
— 231-976 not yet reported which blocks → MI
— 231-981 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - MI 0695 WHITEHALL MI
— 231-988 not yet reported which blocks → MI
— 231-989 not yet reported which blocks → MI
— 231-995 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 TRAVERSECY MI
— 234-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OH
— 234-256 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - OH 464C HUBBARD OH
— 234-260 0–9 XXXall 10 · 5 holders which blocks → AIRESPRING, INC. 996H AKRON OH

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.