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
2014-10-03 608-416 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MADISON WI
2014-09-17 608-447 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F BRODHEAD WI
2014-09-16 608-881 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LA CROSSE WI
2014-09-04 608-573 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 POYNETTE WI
2014-06-27 608-960 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
2014-06-11 608-818 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MONTELLO WI
2014-02-27 608-422 0–9 XXXall 10 · 6 holders which blocks → UNITED STATES CELLULAR - WI 6274 MADISON WI
2013-08-21 608-419 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 PACKWAUKEE WI
2013-08-21 608-613 0XXX2XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 NEW LISBON WI
2013-05-02 608-560 0XXX1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CENTRAL STATE TEL. CO 0859 NECEDAH WI
2013-03-08 608-421 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G MADISON WI
2012-12-07 608-618 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F EDGERTON WI
2012-10-12 608-709 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 TELECOM OF WISCONSIN, LP - WI 7322 MADISON WI
2012-10-01 608-683 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 PORTAGE WI
2012-09-04 608-418 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 ALMA WI
2012-08-21 608-380 0XXX1XXX6XXX7XXX · 4 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F PRARIDCHIN WI
2012-08-21 608-771 0–9 XXXwhole prefix which blocks → CHARTER IP ENABLED SERVICES, LLC 792K VERONA WI
2012-07-13 608-518 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 LA CROSSE WI
2011-08-19 608-336 0–9 XXXall 10 · 5 holders which blocks → UTELCO, INC. 0963 MONROE WI
2011-08-19 608-773 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MID-PLAINS TEL., INC. 0881 CROSS PL WI
2011-08-19 608-858 1XXX5XXX8XXX · 2 holders which blocks → MID-PLAINS TEL., INC. 0881 MIDDLETON WI
2011-08-12 608-765 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C RICHMOND WI
2010-10-25 608-620 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 TELECOM OF WISCONSIN, LP - WI 7322 MADISON WI
2010-09-07 608-520 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F MADISON WI
2010-08-06 608-535 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F MADISON WI
2010-07-23 608-402 0–9 XXXall 10 · 6 holders which blocks → MICHIGAN WIRELESS, LLC DBA BUG TUSSEL WIRELESS 698E BARABOO WI
2010-06-30 608-499 1XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F HAZELGREEN WI
2010-06-23 608-599 1XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K JUDA WI
2010-06-01 608-777 0–9 XXXwhole prefix which blocks → MT. VERNON TEL. CO. 0917 VERONA WI
2010-02-23 608-382 not yet reported which blocks → MICHIGAN WIRELESS, LLC DBA BUG TUSSEL WIRELESS 698E ADAMS WI
2010-02-19 608-593 0–9 XXXall 10 · 6 holders which blocks → MICHIGAN WIRELESS, LLC DBA BUG TUSSEL WIRELESS 698E REEDSBURG WI
2010-01-15 608-813 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K BLACKEARTH WI
2010-01-11 608-736 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C EVANSVILLE WI
2009-12-22 608-557 0–9 XXXall 10 · 4 holders which blocks → MICHIGAN WIRELESS, LLC DBA BUG TUSSEL WIRELESS 698E WONEWOC WI
2009-10-30 608-691 1XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MT VERNON WI
2009-10-28 608-515 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MADISON WI
2009-10-14 608-501 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 STOUGHTON WI
2009-08-14 608-459 0–9 XXXall 10 · 6 holders which blocks → UNITED STATES CELLULAR - WI 6274 SPG GREEN WI
2008-10-10 608-616 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F MADISON WI
2008-10-08 608-521 0XXX1XXX2XXX7XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 READSTOWN WI
2008-10-08 608-545 0XXX5XXX8XXX · 3 holders which blocks → UNITED STATES CELLULAR - WI 6274 YUBA WI
2008-10-08 608-639 0XXX2XXX7XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - WI 6274 LA FARGE WI
2008-10-08 608-804 0XXX1XXX2XXX6XXX7XXX8XXX · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 GENOA WI
2008-09-15 608-721 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C MADISON WI
2008-08-12 608-665 0–9 XXXall 10 · 4 holders which blocks → TDS METROCOM, LLC 520K MADISON WI
2008-08-04 608-622 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
2008-05-22 608-645 not yet reported which blocks → MICHIGAN WIRELESS, LLC DBA BUG TUSSEL WIRELESS 698E MONROE WI
2008-05-14 608-352 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C JANESVILLE WI
2008-04-09 608-420 0–9 XXXall 10 · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ALBANY WI
2008-02-20 608-659 1XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K MINDORO 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.