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
— 608-294 0XXX1XXX7XXX8XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 MADISON WI
— 608-295 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 JANESVILLE WI
— 608-296 0XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 WESTFIELD WI
— 608-297 0XXX1XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 MONTELLO WI
— 608-298 3XXX5XXX6XXX8XXX · 4 holders which blocks → WISCONSIN BELL INC 9327 MADISON WI
— 608-299 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J BELOIT WI
— 608-301 5XXX6XXX7XXX · 2 holders which blocks → WISCONSIN BELL INC 9327 MADISON WI
— 608-302 0XXX1XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JANESVILLE WI
— 608-303 not yet reported which blocks → SPOK, INC. 6630 MADISON WI
— 608-304 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → METROPCS, INC. 5562 LA CROSSE WI
— 608-308 not yet reported which blocks → TDS METROCOM, LLC 520K MADISON WI
— 608-310 4XXX5XXX which blocks → TDS METROCOM, LLC 520K MADISON WI
— 608-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 608-312 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 BELOIT WI
— 608-313 2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → TDS METROCOM, LLC 520K BELOIT WI
— 608-314 4XXX5XXX6XXX7XXX which blocks → TDS METROCOM, LLC 520K JANESVILLE WI
— 608-315 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 TOMAH WI
— 608-316 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MADISON WI
— 608-317 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 LA CROSSE WI
— 608-320 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-321 not yet reported which blocks → TDS METROCOM, LLC 520K MADISON WI
— 608-322 1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JANESVILLE WI
— 608-323 0XXX5XXX which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 ARCADIA WI
— 608-324 not yet reported which blocks → UTELCO, INC. 0963 MONROE WI
— 608-325 not yet reported which blocks → UTELCO, INC. 0963 MONROE WI
— 608-326 not yet reported which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 PRARIDCHIN WI
— 608-327 5XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MADISON WI
— 608-328 not yet reported which blocks → UTELCO, INC. 0963 MONROE WI
— 608-329 not yet reported which blocks → UTELCO, INC. 0963 MONROE WI
— 608-331 1XXX2XXX3XXX4XXX6XXX8XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 PLATTEVL WI
— 608-332 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-334 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-335 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-337 8XXX which blocks → BRIGHTSPEED OF MIDWEST WISCONSIN, LLC 0913 ONTARIO WI
— 608-338 0XXX1XXX2XXX3XXX4XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-339 1XXX which blocks → FRONTIER NORTH INC. - WI 0886 ADAMS WI
— 608-341 2XXX3XXX5XXX · 3 holders which blocks → UNITED STATES CELLULAR - WI 6274 DODGEVILLE WI
— 608-342 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0934 PLATTEVL WI
— 608-343 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 TOMAH WI
— 608-344 2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 TOMAH WI
— 608-345 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MADISON WI
— 608-346 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 BELOIT WI
— 608-347 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MADISON WI
— 608-348 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0934 PLATTEVL WI
— 608-349 not yet reported which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0934 PLATTEVL WI
— 608-354 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MADISON WI
— 608-355 not yet reported which blocks → BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC 0924 BARABOO WI
— 608-356 not yet reported which blocks → BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC 0924 BARABOO WI
— 608-357 not yet reported which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 PRARIDCHIN WI
— 608-359 0XXX2XXX4XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 JANESVILLE 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.