NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 715
NEW CINGULAR WIRELESS PCS, LLC - IL 100
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 99
FRONTIER NORTH INC. - WI 55
WISCONSIN BELL INC 41
CHARTER IP ENABLED SERVICES, LLC 36
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
— 715-495 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 EAU CLAIRE WI
— 715-497 not yet reported which blocks → AERIAL COMMUNICATIONS, INC. 6701 EAU CLAIRE WI
— 715-498 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 STEVENS PT WI
— 715-499 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 RHINELANDR WI
— 715-505 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MENOMONIE WI
— 715-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 715-518 5XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PARK FALLS WI
— 715-519 2XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 CORNELL WI
— 715-520 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPOONER WI
— 715-523 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → AERIAL COMMUNICATIONS, INC. 6701 EAU CLAIRE WI
— 715-524 not yet reported which blocks → FRONTIER COMMUNICATIONS OF WISCONSIN LLC 0964 SHAWANO WI
— 715-526 not yet reported which blocks → FRONTIER COMMUNICATIONS OF WISCONSIN LLC 0964 SHAWANO WI
— 715-528 6XXX which blocks → NIAGARA TEL. CO. 0920 FLORENCE WI
— 715-532 8XXX which blocks → BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC 0924 LADYSMITH WI
— 715-535 5XXX6XXX · 2 holders which blocks → FRONTIER COMMUNICATIONS OF WISCONSIN LLC 0964 TIGERTON WI
— 715-536 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 MERRILL WI
— 715-537 0XXX4XXX7XXX8XXX · 4 holders which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 BARRON WI
— 715-538 3XXX5XXX7XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 WHITEHALL WI
— 715-539 6XXX7XXX · 2 holders which blocks → FRONTIER NORTH INC. - WI 0886 MERRILL WI
— 715-541 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TURTLELAKE WI
— 715-542 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH INC. - WI 0886 SAYNER WI
— 715-543 0XXX1XXX3XXX5XXX · 4 holders which blocks → BRIGHTSPEED OF NORTHERN WISCONSIN, LLC 0956 MANISHWTRS WI
— 715-545 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 PHELPS WI
— 715-546 0XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 THREELAKES WI
— 715-547 0XXX2XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → FRONTIER NORTH INC. - WI 0886 LANDOLAKES WI
— 715-548 0XXX1XXX3XXX5XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PEMBINE WI
— 715-549 0XXX1XXX2XXX3XXX4XXX9XXX · 6 holders which blocks → WISCONSIN BELL INC 9327 HOULTON WI
— 715-550 6XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RHINELANDR WI
— 715-551 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAUSAU WI
— 715-552 not yet reported which blocks → WISCONSIN BELL INC 9327 EAU CLAIRE WI
— 715-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST WI
— 715-556 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MENOMONIE WI
— 715-559 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 EAU CLAIRE WI
— 715-561 0XXX which blocks → BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC 0924 HURLEY WI
— 715-563 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 EAU CLAIRE WI
— 715-564 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BRIGHTSPEED OF NORTHERN WISCONSIN, LLC 0956 BRANTWOOD WI
— 715-565 4XXX5XXX6XXX · 3 holders which blocks → ONVOY, LLC - WI 225C GLENWOODCY WI
— 715-568 0XXX7XXX · 2 holders which blocks → BLOOMER TEL. CO. 0850 BLOOMER WI
— 715-569 7XXX8XXX9XXX · 3 holders which blocks → CENTRAL STATE TEL. CO 0859 VESPER WI
— 715-570 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STEVENS PT WI
— 715-571 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAUSAU WI
— 715-572 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STEVENS PT WI
— 715-573 not yet reported which blocks → NEW CELL DBA CELLCOM 6692 WAUSAU WI
— 715-574 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WAUSAU WI
— 715-575 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STEVENS PT WI
— 715-576 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WAUSAU WI
— 715-577 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 EAU CLAIRE WI
— 715-579 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 EAU CLAIRE WI
— 715-581 not yet reported which blocks → NEW CELL DBA CELLCOM 6692 WAUSAU WI
— 715-582 7XXX which blocks → BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC 0924 PESHTIGO WI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.