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
2025-08-21 608-990 0XXX3XXX4XXX9XXX · 2 holders which blocks → ONVOY, LLC - WI 225C BARABOO WI
2025-08-21 608-991 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - WI 225C BELOIT WI
2025-08-21 608-993 8XXX9XXX which blocks → ONVOY, LLC - WI 225C COBB WI
2025-08-06 608-984 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MADISON WI
2025-07-14 608-920 0XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → HD CARRIER LLC 321J STOUGHTON WI
2025-05-23 608-980 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 REEDSBURG WI
2025-04-23 608-974 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JANESVILLE WI
2025-04-04 608-973 0XXX which blocks → UNITED STATES CELLULAR - WI 6274 BRODHEAD WI
2025-03-18 608-971 9XXX which blocks → T-MOBILE USA, INC. 6529 ELROY WI
2025-03-18 608-972 0XXX8XXX9XXX · 2 holders which blocks → METROPCS, INC. 5562 BOSCOBEL WI
2025-02-28 608-962 9XXX which blocks → METROPCS, INC. 5562 BANGOR WI
2025-02-28 608-964 9XXX which blocks → METROPCS, INC. 5562 BRIGGSVL WI
2025-02-28 608-970 0XXX1XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 PORTAGE WI
2025-02-05 608-961 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WI 225C MADISON WI
2025-01-23 608-956 0XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 RICHLD CTR WI
2025-01-22 608-953 0XXX2XXX3XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LANCASTER WI
2025-01-22 608-954 0XXX1XXX2XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MUSCODA WI
2025-01-21 608-951 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 GALESVILLE WI
2025-01-21 608-952 0XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 HOLMEN WI
2024-08-07 608-608 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C MADISON WI
2024-06-12 608-940 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WI 225C MADISON WI
2024-06-12 608-941 0XXX1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - WI 225C SUNPRAIRIE WI
2024-03-19 608-928 0XXX which blocks → ONVOY, LLC - WI 225C TOMAH WI
2024-03-15 608-923 0XXX1XXX which blocks → ONVOY, LLC - WI 225C OREGON WI
2024-03-14 608-919 1XXX9XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K SOUTHWAYNE WI
2024-02-21 608-917 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WISCONDLLS WI
2024-02-14 608-910 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 MADISON WI
2024-01-25 608-907 0XXX1XXX2XXX7XXX9XXX · 5 holders which blocks → AT&T - LOCAL 7421 EVANSVILLE WI
2024-01-18 608-914 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MADISON WI
2024-01-18 608-915 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MADISON WI
2024-01-18 608-916 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 MADISON WI
2023-12-01 608-905 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 JANESVILLE WI
2023-09-27 608-904 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 BELOIT WI
2023-07-26 608-903 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J LA CROSSE WI
2023-06-22 608-353 0XXX2XXX3XXX8XXX · 4 holders which blocks → ONVOY, LLC - WI 225C MELROSE WI
2023-06-22 608-809 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → ONVOY, LLC - WI 225C BARABOO WI
2023-05-22 608-902 0XXX1XXX8XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DICKEYVL WI
2023-05-02 608-715 0XXX2XXX7XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H ADAMS WI
2023-05-02 608-918 0XXX1XXX9XXX · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H SAUK CITY WI
2023-05-02 608-948 9XXX which blocks → ONVOY SPECTRUM, LLC 624H RIDGEWAY WI
2023-04-10 608-894 0XXX1XXX2XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J ARCADIA WI
2023-04-10 608-896 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J MADISON WI
2023-02-08 608-870 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J STOUGHTON WI
2023-02-08 608-871 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WI 225C LA CROSSE WI
2023-02-08 608-891 0XXX1XXX2XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - WI 225C VIROQUA WI
2023-02-08 608-893 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J MADISON WI
2022-12-08 608-814 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELOIT WI
2022-12-08 608-815 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 JANESVILLE WI
2022-12-08 608-817 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - WI 007F MADISON WI
2022-12-08 608-861 0XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 PACKWAUKEE 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.