NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 574
NEW CINGULAR WIRELESS PCS, LLC - IL 49
FRONTIER NORTH, INC.. - IN 45
INDIANA BELL TEL CO INC 43
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 38
BRIGHTSPEED OF INDIANA, LLC 35
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
— 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
— 574-360 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SOUTH BEND IN
— 574-361 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ELKHART IN
— 574-370 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ELKHART IN
— 574-371 none assigned yet which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW IN
— 574-372 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WARSAW IN
— 574-380 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ATWOOD IN
— 574-382 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 MACY IN
— 574-385 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - IN 097D WARSAW IN
— 574-389 6XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 574-453 none assigned yet which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 LEESBURG IN
— 574-457 none assigned yet which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 SYRACUSE IN
— 574-472 not yet reported which blocks → INDIANA BELL TEL CO INC 9325 SOUTH BEND IN
— 574-491 0XXX which blocks → FRONTIER NORTH, INC.. - IN 0772 BURKET IN
— 574-498 0XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 TIPPECANOE IN
— 574-505 1XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MACY IN
— 574-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX IN
— 574-518 3XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SYRACUSE IN
— 574-520 0XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → AT&T ENTERPRISES, LLC 516C SOUTH BEND IN
— 574-521 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SYRACUSE IN
— 574-522 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-523 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN
— 574-524 0XXX5XXX6XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 ELKHART IN

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.