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 534
NEW CINGULAR WIRELESS PCS, LLC - IL 19
LEVEL 3 COMMUNICATIONS, LLC - WI 18
ONVOY, LLC - WI 14
FRACTEL, LLC 14
TON80 COMMUNICATIONS, LLC 10
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
2022-01-11 534-794 0XXX1XXX2XXX4XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MOSINEE WI
2022-01-11 534-837 4XXX7XXX8XXX · 3 holders which blocks → TON80 COMMUNICATIONS, LLC 516J CRANDON WI
2022-01-07 534-227 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J COLBY WI
2021-12-23 534-204 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J EAU CLAIRE WI
2021-12-17 534-277 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WI 225C STEVENS PT WI
2021-11-24 534-901 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H WAUSAU WI
2021-10-01 534-253 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MARSHFIELD WI
2021-08-18 534-356 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H WAUSAU WI
2021-08-11 534-345 6XXX which blocks → FRACTEL, LLC 965H ELDERON WI
2021-07-02 534-758 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → FRACTEL, LLC 965H SCANDINVIA WI
2021-06-28 534-203 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WI 225C RIVERFALLS WI
2021-05-26 534-535 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → ONVOY, LLC - WI 225C JUNCTIONCY WI
2021-05-13 534-300 0XXX1XXX3XXX · 2 holders which blocks → FRACTEL, LLC 965H DORCHESTER WI
2021-04-08 534-254 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J WAUPACA WI
2021-01-11 534-500 0XXX1XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → FRACTEL, LLC 965H MARATHON WI
2021-01-11 534-800 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H LAKEWOOD WI
2020-10-16 534-234 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H AUBURNDALE WI
2020-08-20 534-600 0XXX1XXX4XXX6XXX7XXX · 3 holders which blocks → FRACTEL, LLC 965H THREELAKES WI
2020-08-20 534-900 0XXX1XXX2XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H PICKEREL WI
2020-07-23 534-200 0–9 XXXall 10 · 3 holders which blocks → CSC WIRELESS, LLC 425J EAU CLAIRE WI
2020-04-24 534-999 0XXX3XXX5XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H STETSONVL WI
2020-04-23 534-222 0XXX2XXX4XXX6XXX · 3 holders which blocks → FRACTEL, LLC 965H AMHERST WI
2020-04-23 534-333 0XXX1XXX2XXX3XXX4XXX7XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H CHILI WI
2020-04-23 534-666 0XXX1XXX2XXX3XXX6XXX7XXX · 5 holders which blocks → FRACTEL, LLC 965H GREENWOOD WI
2020-03-27 534-777 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRACTEL, LLC 965H VESPER WI
2019-01-14 534-888 0XXX1XXX2XXX7XXX8XXX9XXX · 5 holders which blocks → TERRA NOVA TELECOM INC. 145J WAUPACA WI
2018-12-05 534-344 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WI 225C WHITEHALL WI
2018-12-05 534-544 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WI 225C HUDSON WI
2018-11-19 534-444 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WI 225C EAU CLAIRE WI
2018-09-25 534-400 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WI 225C WAUPACA WI
2017-12-28 534-202 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SCANDINVIA WI
2017-10-25 534-201 1XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 CAMERON WI
2017-10-25 534-238 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 DRUMMOND WI
2017-10-25 534-239 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 GRANDVIEW WI
2017-10-25 534-313 3XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 LA POINTE WI
2017-10-25 534-331 1XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 IRON RIVER WI
2017-10-25 534-421 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 MARENGO WI
2017-10-11 534-252 2XXX5XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 CABLE WI
2017-10-11 534-259 6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 BENOIT WI
2017-10-11 534-322 2XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 CORNUCOPIA WI
2017-10-11 534-438 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 BARNES WI
2015-07-24 534-429 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC WI 7216 WAUPACA WI
2015-06-18 534-219 0XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 CANTON WI
2015-06-18 534-229 7XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 LONG LAKE WI
2015-06-18 534-321 0XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 NEW AUBURN WI
2015-06-09 534-349 0XXX1XXX4XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 ELK LAKE WI
2014-11-18 534-248 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WI 5489 RIVERFALLS WI
2011-12-07 534-220 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C CHIPPEWFLS WI
— 534-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WI
— 534-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX 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.