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
— 608-689 not yet reported which blocks → VERNON TEL. COOP. 0966 GENOA WI
— 608-692 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-695 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-697 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 PORTAGE WI
— 608-698 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-700 not yet reported which blocks → WI
— 608-707 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MADISON WI
— 608-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 608-712 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MADISON WI
— 608-713 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 BELOIT WI
— 608-718 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JANESVILLE WI
— 608-723 8XXX9XXX which blocks → FARMERS TEL. CO. 0880 LANCASTER WI
— 608-725 3XXX7XXX9XXX · 3 holders which blocks → FARMERS TEL. CO. 0880 CASSVILLE WI
— 608-727 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 LOGANVILLE WI
— 608-728 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 JANESVILLE WI
— 608-732 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 PLATTEVL WI
— 608-734 7XXX which blocks → TELEPHONE USA OF WISCONSIN, LLC DBA CENTURYLINK 1155 SENECA WI
— 608-735 not yet reported which blocks → RICHLAND-GRANT TEL. COOP., INC. 0942 GAYS MILLS WI
— 608-738 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF WISCONSIN, LLC 0895 LA CROSSE WI
— 608-739 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 MUSCODA WI
— 608-741 not yet reported which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-742 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 PORTAGE WI
— 608-743 9XXX which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-744 not yet reported which blocks → CUBA CITY TEL. EXCH. CO., INC. 0872 CUBA CITY WI
— 608-745 2XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 PORTAGE WI
— 608-748 2XXX3XXX · 2 holders which blocks → CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 1183 FAIRPLAY WI
— 608-750 not yet reported which blocks → TDS METROCOM, LLC 520K JANESVILLE WI
— 608-751 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 JANESVILLE WI
— 608-752 not yet reported which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-753 3XXX5XXX7XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 ARENA WI
— 608-754 not yet reported which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-755 not yet reported which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-756 not yet reported which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-757 not yet reported which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-758 not yet reported which blocks → WISCONSIN BELL INC 9327 JANESVILLE WI
— 608-759 0XXX which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 BENTON WI
— 608-762 not yet reported which blocks → BELMONT TEL. CO. 0847 BELMONT WI
— 608-763 8XXX9XXX · 2 holders which blocks → FARMERS TEL. CO. 0880 POTOSI WI
— 608-764 0XXX3XXX4XXX6XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 DEERFIELD WI
— 608-766 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - WI 225C ELROY WI
— 608-767 6XXX7XXX · 2 holders which blocks → BLACK EARTH TEL. CO. 0849 BLACKEARTH WI
— 608-768 not yet reported which blocks → ONVOY, LLC - WI 225C REEDSBURG WI
— 608-769 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 LA CROSSE WI
— 608-770 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-772 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-774 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JANESVILLE WI
— 608-775 not yet reported which blocks → BRIGHTSPEED OF WISCONSIN, LLC 0895 LA CROSSE WI
— 608-776 not yet reported which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 DARLINGTON WI
— 608-778 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 PLATTEVL WI
— 608-779 not yet reported which blocks → BRIGHTSPEED OF WISCONSIN, LLC 0895 LA CROSSE 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.