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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2026-06-24 715-998 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 WOODVILLE WI
2026-04-03 715-840 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 LUCK WI
2025-07-18 715-982 0XXX which blocks → WAVENATION, LLC 700J EAU CLAIRE WI
2025-06-26 715-608 1XXX which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ELCHO WI
2025-02-28 715-867 5XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 JUNCTIONCY WI
2025-02-18 715-809 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 SIREN WI
2025-01-27 715-729 8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 TIGERTON WI
2025-01-13 715-655 1XXX5XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K AUBURNDALE WI
2024-12-09 715-599 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RHINELANDR WI
2024-10-01 715-534 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 RHINELANDR WI
2024-04-25 715-593 5XXX which blocks → ONVOY SPECTRUM, LLC 624H MINOCQUA WI
2024-02-23 715-433 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H WISCOSNRPD WI
2024-02-19 715-715 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WI 225C RHINELANDR WI
2024-01-25 715-844 0XXX1XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 WAUPACA WI
2024-01-25 715-936 7XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 ELLSWORTH WI
2023-12-11 715-414 1XXX4XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K PRENTICE WI
2023-10-16 715-320 0XXX1XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K BRANTWOOD WI
2023-05-15 715-242 2XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 AMERY WI
2023-02-22 715-974 0XXX6XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 BARRON WI
2023-01-09 715-516 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 RIVERFALLS WI
2022-12-16 715-810 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → COMMIO, LLC 939H MARSHFIELD WI
2022-11-14 715-300 0XXX3XXX7XXX · 2 holders which blocks → ONVOY, LLC - WI 225C BEAR CREEK WI
2022-06-15 715-987 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 SPRING VLY WI
2022-02-18 715-786 1XXX4XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 HAGER CITY WI
2021-12-03 715-728 1XXX2XXX which blocks → NUSO, LLC 478J EAU CLAIRE WI
2021-10-15 715-991 0XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 STEVENS PT WI
2021-09-17 715-980 0XXX1XXX3XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 WHITEHALL WI
2021-07-15 715-992 0XXX8XXX · 2 holders which blocks → ONVOY, LLC - WI 225C MONTDU LAC WI
2021-07-14 715-734 2XXX4XXX7XXX · 2 holders which blocks → ONVOY, LLC - WI 225C STARPRAIRI WI
2021-06-09 715-990 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SHAWANO WI
2021-05-27 715-740 0XXX7XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H BOWLER WI
2021-05-26 715-626 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J LOYAL WI
2021-04-28 715-971 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WAUSAU WI
2021-04-14 715-900 2XXX5XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H EAU CLAIRE WI
2021-03-31 715-981 4XXX which blocks → BRIGHTSPEED OF NORTHERN WISCONSIN, LLC 0956 MANISHWTRS WI
2021-03-22 715-970 0XXX1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H NEWRICHMND WI
2021-03-03 715-918 3XXX7XXX · 2 holders which blocks → BRIGHTSPEED OF NORTHERN WISCONSIN, LLC 0956 BOULDERJCT WI
2020-12-21 715-624 0XXX2XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLC - WI 225C HAYWARD WI
2020-12-18 715-430 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → STRATUS NETWORKS 495J MENOMONIE WI
2020-12-11 715-961 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 HUDSON WI
2020-11-19 715-860 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → STRATUS NETWORKS 495J MARINETTE WI
2020-10-15 715-956 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EAU CLAIRE WI
2020-06-15 715-960 0XXX which blocks → CHARTER IP ENABLED SERVICES, LLC 792K BRUCE WI
2020-04-24 715-932 7XXX which blocks → FRACTEL, LLC 965H ROSHOLT WI
2020-04-14 715-328 0XXX which blocks → CHARTER IP ENABLED SERVICES, LLC 792K DOWNSVILLE WI
2020-03-27 715-390 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C COLBY WI
2020-03-27 715-400 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WI 225C ATHENS WI
2020-03-27 715-710 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - WI 225C EDGAR WI
2020-01-27 715-999 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WI 225C RICE LAKE WI
2019-10-10 715-666 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - WI 225C MARINETTE 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.