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
231-256 MICHIGAN BELL TEL CO 9323 LKLEELANAU MI
231-258 MICHIGAN BELL TEL CO 9323 KALKASKA MI
231-263 BRIGHTSPEED OF NORTHERN MICHIGAN, INC 0705 KINGSLEY MI
231-264 MICHIGAN BELL TEL CO 9323 ELK RAPIDS MI
231-266 MICHIGAN BELL TEL CO 9323 IRONS MI
231-267 MICHIGAN BELL TEL CO 9323 WILLIAMSBG MI
231-269 ACE TEL. CO. OF MICHIGAN, INC. 0704 BUCKLEY MI
231-271 BRIGHTSPEED OF MICHIGAN, LLC 0702 SUTTONSBAY MI
231-274 AMERICAN MESSAGING SERVICES, LLC 9748 TRAVERSECY MI
231-275 BRIGHTSPEED OF MICHIGAN, LLC 0702 LAKE ANN MI
231-276 MICHIGAN BELL TEL CO 9323 INTERLOCHN MI
231-282 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANT MI
231-286 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MUSKEGON MI
231-287 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 BIG RAPIDS MI
231-290 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIAN RIV MI
231-301 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HART MI
231-302 BANDWIDTH.COM CLEC, LLC - MI 991E PETOSKEY MI
231-305 TELNET WORLDWIDE, INC. 817J BIG RAPIDS MI
231-306 TELNET WORLDWIDE, INC. 817J CADILLAC MI
231-307 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MORLEY MI
231-308 TELNET WORLDWIDE, INC. 817J CHARLEVOIX MI
231-309 TELNET WORLDWIDE, INC. 817J MANISTEE MI
231-311 MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
231-312 TELNET WORLDWIDE, INC. 817J FRANKFORT MI
231-313 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TRAVERSECY MI
231-314 TELNET WORLDWIDE, INC. 817J KALKASKA MI
231-315 SPOK, INC. 6630 MUSKEGON MI
231-316 TELNET WORLDWIDE, INC. 817J LUDINGTON MI
231-317 SPOK, INC. 6630 BOYNE CITY MI
231-318 SPOK, INC. 6630 TRAVERSECY MI
231-319 TELNET WORLDWIDE, INC. 817J MACKINAWCY MI
231-322 FRONTIER NORTH, INC. - MI 0695 TRCHRIVBDG MI
231-323 BANDWIDTH.COM CLEC, LLC - MI 991E EASTJORDAN MI
231-325 BRIGHTSPEED OF MICHIGAN, LLC 0702 HONOR MI
231-326 BRIGHTSPEED OF MICHIGAN, LLC 0702 GLEN LAKE MI
231-327 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
231-328 BRIGHTSPEED OF MICHIGAN, LLC 0702 MERRITT MI
231-329 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKEGON MI
231-331 FRONTIER NORTH, INC. - MI 0695 ALDEN MI
231-332 TELNET WORLDWIDE, INC. 817J MUSKEGON MI
231-334 BRIGHTSPEED OF MICHIGAN, LLC 0702 GLEN LAKE MI
231-335 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FREMONT MI
231-336 SPOK, INC. 6630 LUDINGTON MI
231-337 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MCBAIN MI
231-338 BANDWIDTH.COM CLEC, LLC - MI 991E BALDWIN MI
231-339 AMERICAN MESSAGING SERVICES, LLC 9748 MUSKEGON MI
231-342 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
231-343 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 MUSKEGON MI
231-344 TELNET WORLDWIDE, INC. 817J PETOSKEY MI
231-345 BANDWIDTH.COM CLEC, LLC - MI 991E REED CITY 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.