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
— 608-472 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADAMS WI
— 608-474 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ADAMS WI
— 608-476 6XXX which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 STEUBEN WI
— 608-478 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 SUNPRAIRIE WI
— 608-483 not yet reported which blocks → COON VALLEY FARMERS TEL. CO. 0868 CHASEBURG WI
— 608-486 0XXX3XXX7XXX9XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 BANGOR WI
— 608-488 not yet reported which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 MELROSE WI
— 608-489 not yet reported which blocks → HILLSBORO TEL. CO., INC. 0892 HILLSBORO WI
— 608-493 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 MERRIMAC WI
— 608-494 5XXX6XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MONTELLO WI
— 608-504 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C MADISON WI
— 608-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 608-512 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MADISON WI
— 608-513 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MADISON WI
— 608-516 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MADISON WI
— 608-522 not yet reported which blocks → BRIGHTSPEED OF NORTH CENTRAL WISCONSIN, LLC 0924 NO FREEDOM WI
— 608-523 2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → UTELCO, INC. 0963 BLANCHADVL WI
— 608-524 not yet reported which blocks → FRONTIER NORTH INC. - WI 0886 REEDSBURG WI
— 608-525 0XXX which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 ETTRICK WI
— 608-526 not yet reported which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 HOLMEN WI
— 608-527 0XXX9XXX which blocks → MT. VERNON TEL. CO. 0917 NEW GLARUS WI
— 608-528 not yet reported which blocks → VERNON TEL. COOP. 0966 YUBA WI
— 608-531 7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J JANESVILLE WI
— 608-532 3XXX7XXX8XXX · 3 holders which blocks → BRIGHTSPEED OF WESTERN WISCONSIN, LLC 0922 AVOCA WI
— 608-533 not yet reported which blocks → GRANTLAND TELECOM, INC. 0930 WOODMAN WI
— 608-534 0XXX2XXX3XXX4XXX9XXX · 4 holders which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 TREMPEALEU WI
— 608-536 not yet reported which blocks → RICHLAND-GRANT TEL. COOP., INC. 0942 BOAZ WI
— 608-537 not yet reported which blocks → RICHLAND-GRANT TEL. COOP., INC. 0942 BLUE RIVER WI
— 608-538 not yet reported which blocks → RICHLAND-GRANT TEL. COOP., INC. 0942 SABIN WI
— 608-539 not yet reported which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 CENTERVL WI
— 608-542 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAMPDOUGLS WI
— 608-543 1XXX2XXX7XXX · 3 holders which blocks → BRIGHTSPEED OF CENTRAL WISCONSIN, LLC 1159 ARGYLE WI
— 608-544 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 WITWEN WI
— 608-546 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRONTIER NORTH INC. - WI 0886 PLAIN WI
— 608-547 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MAUSTON WI
— 608-548 9XXX which blocks → UNITED STATES CELLULAR - WI 6274 MAUSTON WI
— 608-549 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRONTIER NORTH INC. - WI 0886 BLOOM CITY WI
— 608-550 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MADISON WI
— 608-551 0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 7 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BRODHEAD WI
— 608-552 0XXX1XXX5XXX6XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAMPDOUGLS WI
— 608-553 6XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 DODGEVILLE WI
— 608-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST WI
— 608-556 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
— 608-558 none assigned yet which blocks → UNITED STATES CELLULAR - WI 6274 MONROE WI
— 608-559 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 MADISON WI
— 608-562 not yet reported which blocks → LEMONWEIR VALLEY TEL. CO. 0900 NEW LISBON WI
— 608-564 0XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → FRONTIER NORTH INC. - WI 0886 MONROE CTR WI
— 608-565 8XXX which blocks → CENTRAL STATE TEL. CO 0859 NECEDAH WI
— 608-568 4XXX5XXX6XXX8XXX · 4 holders which blocks → DICKEYVILLE TEL. CORP. 0875 DICKEYVL WI
— 608-572 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 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.