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
2020-12-21 608-454 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - WI 225C OREGON WI
2020-12-21 608-456 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - WI 225C ORFORDVL WI
2020-12-21 608-594 3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → ONVOY, LLC - WI 225C PLAIN WI
2020-12-21 608-694 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - WI 225C COTTAGEGRV WI
2020-12-07 608-860 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WI 225C LA CROSSE WI
2020-11-23 608-394 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LA CROSSE WI
2020-10-16 608-300 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H BLANCHADVL WI
2020-10-16 608-500 0XXX5XXX8XXX · 2 holders which blocks → FRACTEL, LLC 965H BROOKS WI
2020-10-16 608-900 0XXX1XXX6XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H CATARACT WI
2020-10-15 608-621 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MADISON WI
2020-10-02 608-722 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J MADISON WI
2020-09-30 608-398 0–9 XXXall 10 · 5 holders which blocks → AIRESPRING, INC. 996H MADISON WI
2020-09-24 608-200 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BELOIT WI
2020-09-08 608-367 0–9 XXXall 10 · 3 holders which blocks → STRATUS NETWORKS 495J BELOIT WI
2020-09-03 608-389 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F BARABOO WI
2020-08-03 608-292 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J MADISON WI
2020-07-08 608-690 0–9 XXXall 10 · 6 holders which blocks → CSC WIRELESS, LLC 425J MADISON WI
2020-06-15 608-670 0XXX1XXX7XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MOUNTHOREB WI
2020-06-05 608-696 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SPARTA WI
2020-05-14 608-529 1XXX2XXX3XXX7XXX9XXX · 4 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F CUBA CITY WI
2020-05-14 608-681 1XXX which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F VIOLA WI
2020-04-13 608-686 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WI 225C PORTAGE WI
2020-04-01 608-672 1XXX2XXX · 2 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F CHASEBURG WI
2020-04-01 608-679 1XXX2XXX4XXX · 3 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F STODDARD WI
2020-03-05 608-806 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WI 225C FAIRPLAY WI
2020-02-25 608-808 0XXX1XXX8XXX · 2 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F BELMONT WI
2020-02-18 608-656 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F MAUSTON WI
2020-02-13 608-650 0XXX1XXX4XXX5XXX6XXX · 4 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F NECEDAH WI
2020-01-24 608-866 0–9 XXXall 10 · 4 holders which blocks → TERRA NOVA TELECOM INC. 145J MADISON WI
2020-01-14 608-614 1XXX which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F ONTARIO WI
2020-01-14 608-652 1XXX7XXX · 2 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F NORWALK WI
2020-01-14 608-660 1XXX6XXX · 2 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F WILTON WI
2019-12-26 608-933 2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H LYNDON STA WI
2019-12-23 608-503 1XXX3XXX · 2 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F CASHTON WI
2019-12-19 608-812 2XXX3XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ARENA WI
2019-12-06 608-717 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 NO FREEDOM WI
2019-11-21 608-610 1XXX2XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LIME RIDGE WI
2019-10-08 608-668 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 LA CROSSE WI
2019-09-13 608-710 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H MADISON WI
2019-09-09 608-631 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 BELOIT WI
2019-08-07 608-641 0XXX1XXX · 2 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F BENTON WI
2019-08-06 608-607 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K JANESVILLE WI
2019-08-02 608-605 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - WI 225C KENDALL WI
2019-08-01 608-570 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 RICHLD CTR WI
2019-08-01 608-684 0XXX1XXX2XXX3XXX4XXX5XXX6XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F FOOTVILLE WI
2019-05-09 608-600 0XXX3XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - WI 225C CLINTON WI
2019-05-09 608-680 0XXX2XXX3XXX4XXX6XXX · 3 holders which blocks → ONVOY, LLC - WI 225C BROOKLYN WI
2019-04-22 608-716 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MADISON WI
2019-04-18 608-867 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H MADISON WI
2019-04-11 608-602 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 WAUNAKEE 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.