NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

337 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 25
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 12
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
2021-10-26 437-256 not yet reported which blocks → Videotron Ltd. 787G Toronto —
2021-10-26 442-368 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 VICTORVL CA
2021-10-26 445-218 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 QUAKERTOWN PA
2021-10-26 447-766 0–9 XXXall 10 · 9 holders which blocks → FRACTEL, LLC 965H CATLIN IL
2021-10-26 520-596 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 TUCSON AZ
2021-10-26 551-366 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H ENGLEWOOD NJ
2021-10-26 562-579 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E DOWNEY CA
2021-10-26 564-216 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CENTRALIA WA
2021-10-26 575-285 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALAMOGORDO NM
2021-10-26 608-701 1XXX2XXX · 2 holders which blocks → MCC TELEPHONY OF THE MIDWEST, LLC - WI 983F DE SOTO WI
2021-10-26 619-953 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LA JOLLA CA
2021-10-26 626-565 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E ALHAMBRA CA
2021-10-26 626-596 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E EL MONTE CA
2021-10-26 650-602 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MT VIEW CA
2021-10-26 650-675 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PACIFICA CA
2021-10-26 657-516 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2021-10-26 657-524 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2021-10-26 657-530 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BREA CA
2021-10-26 657-957 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2021-10-26 669-331 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2021-10-26 716-547 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 WILLIAMSVL NY
2021-10-26 720-861 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F GEORGETOWN CO
2021-10-26 725-265 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NV
2021-10-26 737-386 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H LAMPASAS TX
2021-10-26 742-888 not yet reported which blocks → ISP Telecom Inc. 4727 Pelham —
2021-10-26 762-304 0–9 XXXall 10 · 4 holders which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 BLUE RIDGE GA
2021-10-26 769-270 0–9 XXXall 10 · 5 holders which blocks → POWERTEL MEMPHIS LICENSES, INC. 7474 FOREST MS
2021-10-26 825-449 not yet reported which blocks → Videotron Ltd. 787G Calgary —
2021-10-26 825-459 not yet reported which blocks → Videotron Ltd. 787G Edmonton —
2021-10-26 857-688 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H DORCHESTER MA
2021-10-26 858-328 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LA MESA CA
2021-10-26 862-385 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NJ 118F PATERSON NJ
2021-10-26 862-386 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 CALDWELL NJ
2021-10-26 862-387 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 PATERSON NJ
2021-10-26 862-388 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NJ 6623 PASSAIC NJ
2021-10-26 908-786 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H PLAINFIELD NJ
2021-10-26 930-252 1XXX2XXX8XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K LYNNVILLE IN
2021-10-26 945-227 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PLANO TX
2021-10-26 970-804 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GREELEY CO
2021-10-26 971-416 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F BEAVERTON OR
2021-10-26 985-347 0–9 XXXall 10 · 2 holders which blocks → VOICESTREAM GSM I, LLC 150C HOUMA LA
2021-10-25 223-667 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H COLUMBIA PA
2021-10-25 224-438 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IL 7136 LAKEZURICH IL
2021-10-25 224-866 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H DESPLAINES IL
2021-10-25 229-501 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 478J ALBANY GA
2021-10-25 240-946 0–9 XXXall 10 · 8 holders which blocks → FRACTEL, LLC 965H WSNG236Z14 MD
2021-10-25 364-213 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → NUSO, LLC 478J BOWLNGGREN KY
2021-10-25 442-944 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H VISTA CA
2021-10-25 445-545 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - PA 547E PHPHSBZN32 PA
2021-10-25 470-866 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E ATLANTA NE GA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.