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 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
2019-10-07 715-515 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - WI 225C LINDSEY WI
2019-10-07 715-910 0XXX1XXX2XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC - WI 225C PITTSVILLE WI
2019-08-15 715-907 0–9 XXXall 10 · 7 holders which blocks → TDS METROCOM, LLC 520K WAUSAU WI
2019-08-14 715-890 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MINOCQUA WI
2019-04-18 715-883 0–9 XXXall 10 · 5 holders which blocks → TDS METROCOM, LLC 520K STEVENS PT WI
2018-12-07 715-500 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WI 225C NEWRICHMND WI
2018-11-07 715-517 1XXX7XXX · 2 holders which blocks → NTERA, LLC - WI 129J HOLCOMBE WI
2018-06-13 715-481 0XXX which blocks → VONAGE AMERICA LLC 197D EAU CLAIRE WI
2017-03-16 715-800 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H STEVENS PT WI
2016-06-03 715-293 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HUDSON WI
2016-04-08 715-227 0–9 XXXall 10 · 6 holders which blocks → AMHERST TELEPHONE COMPANY 279H WAUPACA WI
2015-12-14 715-916 0–9 XXXall 10 · 4 holders which blocks → NET LEC, INC. 6183 SHAWANO WI
2015-02-25 715-997 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 STEVENS PT WI
2015-02-17 715-972 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F STEVENS PT WI
2014-11-27 715-315 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 WISCOSNRPD WI
2014-11-27 715-618 0XXX1XXX2XXX3XXX4XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 ANTIGO WI
2014-11-27 715-660 1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MARSHFIELD WI
2014-11-22 715-908 4XXX5XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 TOMAHAWK WI
2014-11-08 715-496 2XXX5XXX6XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 STEVENS PT WI
2014-09-17 715-788 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J RICE LAKE WI
2014-09-16 715-380 0XXX6XXX7XXX · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CRIVITZ WI
2014-09-16 715-600 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F STEVENS PT WI
2014-09-10 715-947 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - WI 225C SUPERIOR WI
2014-08-29 715-888 0–9 XXXall 10 · 5 holders which blocks → BALDWIN BROADBAND, LLC - WI 169E NEWRICHMND WI
2014-07-24 715-716 0–9 XXXall 10 · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 HUDSON WI
2014-04-08 715-602 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F WAUPACA WI
2013-08-21 715-899 0XXX1XXX2XXX4XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 POLONIA WI
2013-04-15 715-753 1XXX2XXX3XXX6XXX · 3 holders which blocks → MIDWAY TEL. CO. 0909 MEDFORD WI
2013-03-08 715-714 1XXX2XXX4XXX5XXX7XXX · 2 holders which blocks → NUSO, LLC 551G EAU CLAIRE WI
2013-01-25 715-806 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SCANDINAVIA TEL. CO. 0945 IOLA WI
2012-11-16 715-721 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 COLBY WI
2012-08-15 715-725 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PLTC, LLC - WI 375F CECIL WI
2011-04-13 715-802 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 WAUPACA WI
2011-03-24 715-245 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 HUDSON WI
2011-02-17 715-901 0XXX1XXX3XXX4XXX which blocks → ONVOY, LLC - WI 225C EAU CLAIRE WI
2011-02-07 715-994 0XXX1XXX2XXX3XXX4XXX7XXX9XXX · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K KESHENA WI
2010-08-04 715-914 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 RICE LAKE WI
2010-07-23 715-782 0XXX1XXX2XXX4XXX7XXX9XXX · 4 holders which blocks → MICHIGAN WIRELESS, LLC DBA BUG TUSSEL WIRELESS 698E COLOMA WI
2010-07-23 715-951 0XXX1XXX2XXX7XXX · 2 holders which blocks → MICHIGAN WIRELESS, LLC DBA BUG TUSSEL WIRELESS 698E ALMOND WI
2010-07-23 715-993 0XXX1XXX2XXX3XXX6XXX7XXX · 4 holders which blocks → MICHIGAN WIRELESS, LLC DBA BUG TUSSEL WIRELESS 698E HANCOCK WI
2010-07-06 715-633 1XXX3XXX · 2 holders which blocks → PLTC, LLC - WI 375F GOODMAN WI
2010-03-01 715-814 0–9 XXXall 10 · 7 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MOSINEE WI
2010-02-25 715-240 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MILL CREEK WI
2010-02-25 715-303 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 STEVENS PT WI
2010-02-25 715-438 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 CHIPPEWFLS WI
2009-12-22 715-969 0XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 SUPERIOR WI
2009-11-25 715-504 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MARINETTE WI
2009-10-12 715-973 0XXX1XXX3XXX4XXX5XXX7XXX · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MARION WI
2009-10-07 715-201 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K SHAWANO WI
2009-10-07 715-420 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K RHINELANDR WI

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.