NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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, last 30 days
8X8, INC. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
2023-02-02 368-202 not yet reported which blocks → Bell Mobility 6574 Calgary —
2023-02-02 438-236 not yet reported which blocks → Fibernetics Corporation 464D Montreal —
2023-02-02 458-297 8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HALFWAY OR
2023-02-02 579-505 not yet reported which blocks → Fibernetics Corporation 464D Laval-Est —
2023-02-02 579-506 not yet reported which blocks → Fibernetics Corporation 464D Laval-Ouest —
2023-02-02 657-659 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2023-02-02 657-661 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2023-02-02 657-662 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2023-02-02 657-664 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SILVERADO CA
2023-02-02 930-274 6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAKEMONROE IN
2023-02-02 941-332 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E SARASOTA FL
2023-02-01 218-588 0XXX1XXX2XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MN 5256 MARBLE MN
2023-02-01 252-298 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J GREENVILLE NC
2023-02-01 260-326 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NUSO, LLC 732J NEW HAVEN IN
2023-02-01 308-206 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 KEARNEY NE
2023-02-01 352-768 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 WILDWOOD FL
2023-02-01 352-774 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GAINESVL FL
2023-02-01 386-363 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DAYTONABCH FL
2023-02-01 412-674 0–9 XXXwhole prefix which blocks → ONVOY, LLC - PA 547E PTGSBNZN12 PA
2023-02-01 435-332 2XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HANKSVILLE UT
2023-02-01 435-342 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DNGLNG RPE UT
2023-02-01 435-343 3XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MANILA UT
2023-02-01 448-216 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PENSACOLA FL
2023-02-01 458-296 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J EUGENE OR
2023-02-01 463-283 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J GREENWOOD IN
2023-02-01 474-678 not yet reported which blocks → Fibernetics Corporation 464D Osler —
2023-02-01 474-679 not yet reported which blocks → Fibernetics Corporation 464D Perdue —
2023-02-01 474-680 not yet reported which blocks → Fibernetics Corporation 464D Vonda —
2023-02-01 502-683 0XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BEDFORD KY
2023-02-01 574-395 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 732J SOUTH BEND IN
2023-02-01 579-980 not yet reported which blocks → Fibernetics Corporation 464D St-Jerome —
2023-02-01 873-895 not yet reported which blocks → Fibernetics Corporation 464D Lac-Megantic —
2023-02-01 904-892 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - FL 937C JACKSONVL FL
2023-02-01 929-662 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN12 NY
2023-02-01 930-272 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J COLUMBUS IN
2023-02-01 930-273 1XXX7XXX which blocks → NUSO, LLC 732J BLOOMINGTN IN
2023-02-01 931-376 0XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BLANCHE TN
2023-02-01 986-248 1XXX7XXX8XXX which blocks → NUSO, LLC 732J COERDALENE ID
2023-01-31 206-206 0–9 XXXall 10 · 3 holders which blocks → LEAP TELECOM, LLC 616J SEATTLE WA
2023-01-31 438-529 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2023-01-31 438-531 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2023-01-31 474-667 not yet reported which blocks → Fibernetics Corporation 464D Aberdeen —
2023-01-31 474-668 not yet reported which blocks → Fibernetics Corporation 464D Allan —
2023-01-31 474-669 not yet reported which blocks → Fibernetics Corporation 464D Alvena —
2023-01-31 474-670 not yet reported which blocks → Fibernetics Corporation 464D Beechy —
2023-01-31 474-671 not yet reported which blocks → Fibernetics Corporation 464D Blaine Lake —
2023-01-31 474-672 not yet reported which blocks → Fibernetics Corporation 464D Colonsay —
2023-01-31 474-673 not yet reported which blocks → Fibernetics Corporation 464D Duck Lake —
2023-01-31 474-674 not yet reported which blocks → Fibernetics Corporation 464D Hafford —
2023-01-31 474-675 not yet reported which blocks → Fibernetics Corporation 464D Hanley —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.