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)

Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.

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-NXXAssigneeOCNRate centerState
231-494 AMERICAN MESSAGING SERVICES, LLC 9748 BIG RAPIDS MI
231-497 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BOYNE CITY MI
231-499 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
231-510 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MANISTEE MI
231-511 MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
231-512 AMERICAN MESSAGING SERVICES, LLC 9748 TRAVERSECY MI
231-514 AMERICAN MESSAGING SERVICES, LLC 9748 CADILLAC MI
231-516 AMERICAN MESSAGING SERVICES, LLC 9748 PETOSKEY MI
231-517 MI
231-522 123.NET, LLC 2550 LUTHER MI
231-525 MICHIGAN BELL TEL CO 9323 WOLVERINE MI
231-526 MICHIGAN BELL TEL CO 9323 HARBOR SPG MI
231-527 MICHIGAN BELL TEL CO 9323 BIG RAPIDS MI
231-529 BRIGHTSPEED OF MICHIGAN, LLC 0702 BRUTUS MI
231-533 FRONTIER NORTH, INC. - MI 0695 BELLAIRE MI
231-535 MICHIGAN BELL TEL CO 9323 WALLOON LK MI
231-536 MICHIGAN BELL TEL CO 9323 EASTJORDAN MI
231-537 BRIGHTSPEED OF MICHIGAN, LLC 0702 LEVERING MI
231-539 MICHIGAN BELL TEL CO 9323 PELLSTON MI
231-544 FRONTIER NORTH, INC. - MI 0695 CENTRAL LK MI
231-546 BRIGHTSPEED OF MICHIGAN, LLC 0702 ELMIRA MI
231-547 MICHIGAN BELL TEL CO 9323 CHARLEVOIX MI
231-548 BRIGHTSPEED OF MICHIGAN, LLC 0702 ALANSON MI
231-549 BRIGHTSPEED OF MICHIGAN, LLC 0702 BOYNEFALLS MI
231-555 MULTIPLE OCN LISTING MULT DIR ASST MI
231-557 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
231-563 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
231-564 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KALKASKA MI
231-568 123.NET, LLC 2550 TRAVERSECY MI
231-569 AMERICAN MESSAGING SERVICES, LLC 9748 PETOSKEY MI
231-571 FRONTIER NORTH, INC. - MI 0695 MUSKEGON MI
231-578 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
231-582 MICHIGAN BELL TEL CO 9323 BOYNE CITY MI
231-584 PIGEON TEL. CO. 0721 ALBA MI
231-585 PIGEON TEL. CO. 0721 LAKE NORTH MI
231-586 MI
231-587 MICHIGAN BELL TEL CO 9323 MANCELONA MI
231-588 FRONTIER NORTH, INC. - MI 0695 ELLSWORTH MI
231-590 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
231-591 MICHIGAN BELL TEL CO 9323 BIG RAPIDS MI
231-592 MICHIGAN BELL TEL CO 9323 BIG RAPIDS MI
231-593 SPOK, INC. 6630 CADILLAC MI
231-594 TWILIO INTERNATIONAL, INC. 506J HART MI
231-596 SPOK, INC. 6630 HARBOR SPG MI
231-597 MICHIGAN BELL TEL CO 9323 CHEBOYGAN MI
231-598 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIG RAPIDS MI
231-599 FRONTIER NORTH, INC. - MI 0695 EASTPORT MI
231-604 SPOK, INC. 6630 KALKASKA MI
231-605 SPOK, INC. 6630 NEWAYGO MI
231-608 SPOK, INC. 6630 FRANKFORT MI

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.