NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 574-251 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-252 1XXX6XXX9XXX · 2 holders which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-254 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-255 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-256 8XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-257 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-258 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-259 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-262 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-264 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-266 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-267 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW IN
— 574-268 none assigned yet which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW IN
— 574-269 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW IN
— 574-271 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-272 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-273 7XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-274 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SOUTH BEND IN
— 574-276 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SOUTH BEND IN
— 574-277 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-278 not yet reported which blocks → PULASKI-WHITE RURAL TEL. COOP., INC. 0813 BUFFALO IN
— 574-280 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-282 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-283 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-284 8XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-286 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SOUTH BEND IN
— 574-287 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-288 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-289 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-291 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-292 7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
— 574-293 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-294 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-295 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-296 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-298 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
— 574-299 3XXX6XXX which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-304 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ELKHART IN
— 574-305 2XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MILLWOOD IN
— 574-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 574-315 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 SOUTH BEND IN
— 574-320 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 ELKHART IN
— 574-321 0XXX2XXX3XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ROCHESTER IN
— 574-323 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IN 7314 SOUTH BEND IN
— 574-328 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BURKET IN
— 574-329 5XXX7XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 OSCEOLA IN
— 574-332 2XXX3XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARGOS IN
— 574-340 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SOUTH BEND IN
— 574-342 7XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 BOURBON IN
— 574-353 0XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 MENTONE IN

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.