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
2009-07-13 715-540 0XXX1XXX5XXX6XXX8XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K RUDOLPH WI
2009-05-04 715-968 0XXX which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F EAU CLAIRE WI
2008-07-02 715-701 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 SHAWANO WI
2008-06-25 715-464 0–9 XXXall 10 · 2 holders which blocks → AT&T ENTERPRISES, LLC 516C EAU CLAIRE WI
2008-06-11 715-625 0XXX1XXX5XXX · 3 holders which blocks → METRO SOUTHWEST PCS, LLP 9759 FLORENCE WI
2008-05-28 715-930 1XXX6XXX7XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 EAU CLAIRE WI
2008-04-17 715-944 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHIPPEWFLS WI
2008-03-07 715-706 1XXX4XXX6XXX7XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K DRESSER WI
2008-03-06 715-708 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K FALL CREEK WI
2008-03-06 715-812 1XXX7XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WASHBURN WI
2008-03-06 715-917 1XXX7XXX8XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ELK MOUND WI
2008-03-06 715-989 0XXX1XXX7XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WHEELER WI
2008-02-20 715-724 0XXX1XXX2XXX7XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K EAGLEPOINT WI
2008-02-20 715-915 1XXX5XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K SPIDERLAKE WI
2008-01-29 715-230 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 CADOTT WI
2007-04-26 715-957 0XXX1XXX5XXX7XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K STONE LAKE WI
2007-04-18 715-919 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 SUPERIOR WI
2007-04-18 715-996 not yet reported which blocks → CENTRAL WISCONSIN COMMUNICATIONS, INC. - WI 997C MARSHFIELD WI
2007-03-30 715-690 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → BALDWIN BROADBAND, LLC - WI 169E HUDSON WI
2007-02-26 715-731 0XXX1XXX3XXX8XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K SHELL LAKE WI
2007-01-10 715-713 0XXX1XXX3XXX4XXX7XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K CLEGHORN WI
2007-01-10 715-978 0XXX7XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K CADOTT WI
2006-10-12 715-780 0XXX1XXX2XXX6XXX7XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PHILLIPS WI
2006-09-14 715-718 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K SUPERIOR WI
2006-09-01 715-928 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 BALDWIN WI
2006-05-21 715-913 0XXX7XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K BAYFIELD WI
2006-03-27 715-510 0XXX1XXX2XXX7XXX8XXX · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K NEKOOSA WI
2006-03-27 715-909 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 7 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K PT EDWARDS WI
2006-02-14 715-807 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 RHINELANDR WI
2006-02-09 715-870 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 WAUSAU WI
2006-02-08 715-513 6XXX7XXX9XXX which blocks → METRO SOUTHWEST PCS, LLP 9759 WAUPACA WI
2005-12-08 715-670 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K BLCKRIVFLS WI
2005-12-08 715-709 0XXX5XXX7XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K STANLEY WI
2005-12-07 715-912 1XXX2XXX3XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 EAU CLAIRE WI
2005-12-06 715-719 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K RICE LAKE WI
2005-11-08 715-741 not yet reported which blocks → METRO SOUTHWEST PCS, LLP 9759 WISCOSNRPD WI
2005-10-17 715-808 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J HUDSON WI
2005-10-04 715-650 9XXX which blocks → METRO SOUTHWEST PCS, LLP 9759 MARSHFIELD WI
2005-10-04 715-707 5XXX6XXX8XXX9XXX · 2 holders which blocks → METRO SOUTHWEST PCS, LLP 9759 IOLA WI
2005-09-13 715-801 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K PESHTIGO WI
2005-08-03 715-712 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WISCOSNRPD WI
2005-02-18 715-730 1XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NAMEKGONLK WI
2005-02-18 715-813 7XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PORT WING WI
2005-02-18 715-815 1XXX7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MAPLE WI
2005-01-13 715-680 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MARATHON WI
2004-12-15 715-818 not yet reported which blocks → CENTRAL WISCONSIN COMMUNICATIONS, INC. - WI 997C WISCOSNRPD WI
2004-12-08 715-941 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 ELLSWORTH WI
2004-10-26 715-514 0–9 XXXall 10 · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K EAU CLAIRE WI
2004-08-16 715-977 6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 HAMMOND WI
2004-08-13 715-326 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TIGERTON 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.