NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
— 586-930 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 UTICA MI
— 586-932 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 UTICA MI
— 586-933 0XXX1XXX3XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WARREN MI
— 586-935 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → METROPCS, INC. 5562 WASHINGTON MI
— 586-939 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WARREN MI
— 586-940 2XXX3XXX4XXX5XXX6XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-942 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-943 2XXX which blocks → METROPCS, INC. 5562 ROSEVILLE MI
— 586-944 0XXX2XXX which blocks → METROPCS, INC. 5562 ROSEVILLE MI
— 586-945 2XXX which blocks → METROPCS, INC. 5562 ROSEVILLE MI
— 586-946 6XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-947 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CENTERLINE MI
— 586-948 8XXX9XXX which blocks → MICHIGAN BELL TEL CO 9323 MT CLEMENS MI
— 586-949 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MT CLEMENS MI
— 586-950 not yet reported which blocks → MI
— 586-954 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 MT CLEMENS MI
— 586-958 not yet reported which blocks → MI
— 586-959 not yet reported which blocks → MI
— 586-960 3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ROMEO MI
— 586-961 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-974 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WARREN MI
— 586-975 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MT CLEMENS MI
— 586-976 not yet reported which blocks → MI
— 586-977 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WARREN MI
— 586-978 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WARREN MI
— 586-979 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 WARREN MI
— 586-980 6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MT CLEMENS MI
— 586-981 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WARREN MI
— 586-983 6XXX8XXX9XXX · 3 holders which blocks → MICHIGAN BELL TEL CO 9323 WARREN MI
— 586-986 not yet reported which blocks → MICHIGAN BELL TEL CO 9323 CENTERLINE MI
— 586-988 not yet reported which blocks → MI
— 586-989 not yet reported which blocks → MI
— 586-994 7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-995 7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-996 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARREN MI
— 586-997 7XXX8XXX · 2 holders which blocks → MICHIGAN BELL TEL CO 9323 UTICA MI
— 601-200 none assigned yet which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 JACKSON MS
— 601-201 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JACKSON MS
— 601-206 0XXX2XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 JACKSON MS
— 601-207 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MS 719E MERIDIAN MS
— 601-208 0XXX9XXX · 2 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 JACKSON MS
— 601-209 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JACKSON MS
— 601-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MS
— 601-212 not yet reported which blocks → POWERTEL MEMPHIS LICENSES, INC. 7474 JACKSON MS
— 601-214 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JACKSON MS
— 601-215 2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MS 6396 PICAYUNE MS
— 601-216 7XXX which blocks → ONVOY, LLC - MS 719E MOUNTOLIVE MS
— 601-217 not yet reported which blocks → TELEPAK NETWORKS, INC. - MS 5278 BRANDON MS
— 601-218 not yet reported which blocks → CELLULAR SOUTH, INC. 6581 VICKSBURG MS
— 601-221 not yet reported which blocks → MS

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.