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
— 574-360 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
— 574-526 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 LEESBURG IN
— 574-527 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 LEESBURG IN
— 574-528 4XXX which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 SYRACUSE IN
— 574-529 7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 SYRACUSE IN
— 574-532 none assigned yet which blocks → METROPCS, INC. 5562 SOUTH BEND IN
— 574-533 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-534 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-535 none assigned yet which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-536 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 GOSHEN IN
— 574-537 not yet reported which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-538 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 GOSHEN IN
— 574-542 5XXX7XXX · 2 holders which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 MONTEREY IN
— 574-546 6XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 BREMEN IN
— 574-549 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARSAW IN
— 574-551 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WARSAW IN
— 574-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST IN
— 574-566 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → FRONTIER NORTH, INC.. - IN 0772 CLAYPOOL IN
— 574-581 2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MONTICELLO IN
— 574-583 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 MONTICELLO IN
— 574-584 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → FBN INDIANA, INC. - IN 4117 ELKHART IN
— 574-586 1XXX5XXX6XXX8XXX · 3 holders which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 WALKERTON IN
— 574-594 not yet reported which blocks → BRIGHTSPEED OF INDIANA, LLC 0832 PIERCETON IN
— 574-595 not yet reported which blocks → PULASKI-WHITE RURAL TEL. COOP., INC. 0813 STAR CITY IN
— 574-596 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 ELKHART IN
— 574-598 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → RTC COMMUNICATIONS CORP. 4552 AKRON IN
— 574-603 3XXX4XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BURNETTSVL IN
— 574-607 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 OSCEOLA 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.