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 608
WISCONSIN BELL INC 80
UNITED STATES CELLULAR - WI 76
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 54
FRONTIER NORTH INC. - WI 53
ONVOY, LLC - WI 50
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
2022-11-08 608-651 1XXX6XXX7XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K RICHMOND WI
2022-05-09 608-805 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - WI 225C REEDSBURG WI
2022-03-18 608-939 1XXX3XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MONROE CTR WI
2022-03-18 608-995 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J VERONA WI
2022-03-08 608-740 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J MADISON WI
2022-03-07 608-840 0XXX2XXX8XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MONTICELLO WI
2022-03-03 608-760 0XXX8XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J TREMPEALEU WI
2022-03-03 608-869 0XXX1XXX8XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J LODI WI
2022-03-01 608-978 8XXX which blocks → TON80 COMMUNICATIONS, LLC 516J MARSHALL WI
2022-02-28 608-880 0XXX8XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WITWEN WI
2022-02-28 608-998 8XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J VIOLA WI
2022-02-24 608-992 2XXX9XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SABIN WI
2022-02-24 608-997 4XXX7XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WAUNAKEE WI
2022-02-17 608-878 0XXX7XXX8XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J STEUBEN WI
2022-02-17 608-908 9XXX which blocks → TON80 COMMUNICATIONS, LLC 516J WAUMANDEE WI
2022-02-17 608-936 0XXX2XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WAUZEKA WI
2022-02-17 608-945 0XXX4XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MOUNT ZION WI
2022-02-17 608-947 3XXX which blocks → TON80 COMMUNICATIONS, LLC 516J LIBETYPOLE WI
2022-02-17 608-969 1XXX6XXX9XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WIOTA WI
2022-02-04 608-414 1XXX2XXX4XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - WI 225C MINERAL PT WI
2022-01-31 608-816 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 LA CROSSE WI
2022-01-27 608-932 7XXX which blocks → TON80 COMMUNICATIONS, LLC 516J LA VALLE WI
2022-01-18 608-801 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F DE FOREST WI
2022-01-14 608-913 7XXX which blocks → TON80 COMMUNICATIONS, LLC 516J COCHRANE WI
2022-01-14 608-926 1XXX2XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ENDEAVOR WI
2022-01-14 608-942 1XXX6XXX · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CAZENOVIA WI
2022-01-08 608-508 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 WESTFIELD WI
2021-11-12 608-601 0XXX1XXX2XXX4XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F MCFARLAND WI
2021-11-05 608-810 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 PORTAGE WI
2021-10-26 608-701 1XXX2XXX · 2 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F DE SOTO WI
2021-07-26 608-714 4XXX5XXX6XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H MERRIMAC WI
2021-07-26 608-803 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 6 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SPG GREEN WI
2021-07-15 608-703 0XXX1XXX3XXX6XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - WI 225C NEW GLARUS WI
2021-07-14 608-674 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 4 holders which blocks → ONVOY, LLC - WI 225C MILTON WI
2021-07-14 608-702 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → ONVOY, LLC - WI 225C PARDEEVL WI
2021-07-02 608-505 0XXX1XXX5XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - WI 225C POYNETTE WI
2021-07-02 608-506 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 7 holders which blocks → ONVOY, LLC - WI 225C WONEWOC WI
2021-07-02 608-946 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H EDGERTON WI
2021-06-29 608-944 1XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H WOODFORD WI
2021-06-28 608-706 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 TOMAH WI
2021-06-24 608-502 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - WI 225C EVANSVILLE WI
2021-06-18 608-671 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 BELOIT WI
2021-05-28 608-895 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J MADISON WI
2021-05-14 608-730 0–9 XXXall 10 · 8 holders which blocks → HD CARRIER LLC 321J STOUGHTON WI
2021-05-03 608-673 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J MADISON WI
2021-04-24 608-704 0XXX6XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 WEST SALEM WI
2021-04-12 608-746 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J JANESVILLE WI
2021-02-11 608-761 1XXX2XXX5XXX · 3 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F SENECA WI
2021-02-10 608-749 0XXX1XXX4XXX · 3 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F EASTMAN WI
2020-12-21 608-453 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WI 225C SUNPRAIRIE 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.