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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 608-361 8XXX which blocks → WISCONSIN BELL INC 9327 BELOIT WI
— 608-362 not yet reported which blocks → WISCONSIN BELL INC 9327 BELOIT WI
— 608-363 not yet reported which blocks → WISCONSIN BELL INC 9327 BELOIT WI
— 608-364 not yet reported which blocks → WISCONSIN BELL INC 9327 BELOIT WI
— 608-365 not yet reported which blocks → WISCONSIN BELL INC 9327 BELOIT WI
— 608-366 not yet reported which blocks → BRIGHTSPEED OF MIDWEST WISCONSIN, LLC 0913 SPARTA WI
— 608-368 7XXX which blocks → AT&T ENTERPRISES, LLC 516C BELOIT WI
— 608-369 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - WI 6274 WESTFIELD WI
— 608-372 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 TOMAH WI
— 608-373 1XXX4XXX5XXX8XXX · 3 holders which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-374 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 TOMAH WI
— 608-375 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 BOSCOBEL WI
— 608-376 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MADISON WI
— 608-377 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 TOMAH WI
— 608-378 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 WARRENS WI
— 608-381 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MADISON WI
— 608-385 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LA CROSSE WI
— 608-386 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 LA CROSSE WI
— 608-388 not yet reported which blocks → BRIGHTSPEED OF MIDWEST WISCONSIN, LLC 0913 SPARTA WI
— 608-392 not yet reported which blocks → BRIGHTSPEED OF WISCONSIN, LLC 0895 LA CROSSE WI
— 608-393 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 BARABOO WI
— 608-395 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 MADISON WI
— 608-397 3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 LA CROSSE WI
— 608-401 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MAZOMANIE WI
— 608-403 0–9 XXXall 10 · 4 holders which blocks → UNITED STATES CELLULAR - WI 6274 ADAMS WI
— 608-409 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C ARCADIA WI
— 608-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 608-423 0XXX2XXX5XXX6XXX8XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 CAMBRIDGE WI
— 608-424 0XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 BELLEVILLE WI
— 608-425 1XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 DODGEVILLE WI
— 608-426 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → UNITED STATES CELLULAR - WI 6274 MONROE WI
— 608-427 not yet reported which blocks → LEMONWEIR VALLEY TEL. CO. 0900 CAMPDOUGLS WI
— 608-429 0XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 PARDEEVL WI
— 608-430 0XXX1XXX3XXX4XXX7XXX9XXX · 5 holders which blocks → ONVOY, LLC - WI 225C ETTRICK WI
— 608-431 0XXX1XXX2XXX3XXX · 3 holders which blocks → ONVOY, LLC - WI 225C FOUNTAINCY WI
— 608-432 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 WISCONDLLS WI
— 608-435 9XXX which blocks → BRIGHTSPEED OF MIDWEST WISCONSIN, LLC 0913 WILTON WI
— 608-437 not yet reported which blocks → MT. HOREB TEL. CO. 0916 MOUNTHOREB WI
— 608-439 4XXX8XXX · 2 holders which blocks → UTELCO, INC. 0963 SOUTHWAYNE WI
— 608-441 not yet reported which blocks → TDS METROCOM, LLC 520K MADISON WI
— 608-444 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MADISON WI
— 608-446 not yet reported which blocks → TDS METROCOM, LLC 520K MADISON WI
— 608-452 not yet reported which blocks → COON VALLEY FARMERS TEL. CO. 0868 COONVALLEY WI
— 608-455 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 BROOKLYN WI
— 608-457 not yet reported which blocks → COON VALLEY FARMERS TEL. CO. 0868 STODDARD WI
— 608-462 3XXX7XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 ELROY WI
— 608-463 2XXX which blocks → BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC 0924 KENDALL WI
— 608-464 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 WONEWOC WI
— 608-465 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → UTELCO, INC. 0963 WOODFORD WI
— 608-471 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF WISCONSIN, LLC - WI 227F MADISON 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.