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
— 608-574 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 DODGEVILLE WI
— 608-575 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MADISON WI
— 608-576 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MADISON WI
— 608-578 not yet reported which blocks → SPOK, INC. 6630 MADISON WI
— 608-582 not yet reported which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 GALESVILLE WI
— 608-583 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 LONE ROCK WI
— 608-584 not yet reported which blocks → MARQUETTE-ADAMS TEL. COOP., INC. 0908 BROOKS WI
— 608-585 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 ITHACA WI
— 608-586 not yet reported which blocks → MARQUETTE-ADAMS TEL. COOP., INC. 0908 OXFORD WI
— 608-587 not yet reported which blocks → MARQUETTE-ADAMS TEL. COOP., INC. 0908 ENDEAVOR WI
— 608-588 0XXX1XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 SPG GREEN WI
— 608-589 not yet reported which blocks → MARQUETTE-ADAMS TEL. COOP., INC. 0908 PACKWAUKEE WI
— 608-592 0XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 LODI WI
— 608-596 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH, INC. - IL 1036 NOAPPLERIV WI
— 608-603 not yet reported which blocks → SPOK, INC. 6630 JANESVILLE WI
— 608-604 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 RICHLD CTR WI
— 608-606 6XXX7XXX8XXX · 3 holders which blocks → UNITED STATES CELLULAR - WI 6274 VIROQUA WI
— 608-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 608-623 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 COBB WI
— 608-624 not yet reported which blocks → RICHLAND-GRANT TEL. COOP., INC. 0942 SOLDIRSGRV WI
— 608-625 not yet reported which blocks → VERNON TEL. COOP. 0966 LA FARGE WI
— 608-626 not yet reported which blocks → COCHRANE COOP. TEL. CO. 0866 WAUMANDEE WI
— 608-627 not yet reported which blocks → VERNON TEL. COOP. 0966 VIOLA WI
— 608-629 not yet reported which blocks → VERNON TEL. COOP. 0966 READSTOWN WI
— 608-630 0–9 XXXall 10 · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MADISON WI
— 608-632 5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 WESTBY WI
— 608-634 not yet reported which blocks → VERNON TEL. COOP. 0966 WESTBY WI
— 608-635 0XXX5XXX6XXX · 2 holders which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 POYNETTE WI
— 608-637 not yet reported which blocks → FRONTIER COMMUNICATIONS OF WISCONSIN LLC 0967 VIROQUA WI
— 608-642 6XXX7XXX8XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 PLATTEVL WI
— 608-643 9XXX which blocks → FRONTIER NORTH INC. - WI 0886 SAUK CITY WI
— 608-644 4XXX5XXX6XXX7XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 SAUK CITY WI
— 608-646 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J STOUGHTON WI
— 608-647 0XXX which blocks → FRONTIER NORTH INC. - WI 0886 RICHLD CTR WI
— 608-648 not yet reported which blocks → VERNON TEL. COOP. 0966 DE SOTO WI
— 608-654 8XXX9XXX · 2 holders which blocks → BRIGHTSPEED OF MIDWEST WISCONSIN, LLC 0913 CASHTON WI
— 608-655 0XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 MARSHALL WI
— 608-657 not yet reported which blocks → SPOK, INC. 6630 MADISON WI
— 608-661 not yet reported which blocks → TDS METROCOM, LLC 520K MADISON WI
— 608-662 not yet reported which blocks → TDS METROCOM, LLC 520K MIDDLETON WI
— 608-663 not yet reported which blocks → TDS METROCOM, LLC 520K MADISON WI
— 608-664 not yet reported which blocks → TDS METROCOM, LLC 520K MIDDLETON WI
— 608-666 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 LYNDON STA WI
— 608-667 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LA CROSSE WI
— 608-675 not yet reported which blocks → VERNON TEL. COOP. 0966 LIBETYPOLE WI
— 608-676 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRONTIER NORTH INC. - WI 0886 CLINTON WI
— 608-677 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH, INC. - IL 1036 NO WARREN WI
— 608-678 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WISCONDLLS WI
— 608-685 9XXX which blocks → TENNEY TEL. CO. 0958 ALMA WI
— 608-687 not yet reported which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 FOUNTAINCY 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.