NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 909
FRONTIER CALIFORNIA INC. 156
T-MOBILE USA, INC. 87
NEW CINGULAR WIRELESS PCS, LLC 75
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 72
METROPCS NETWORKS, LLC 52
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
2025-10-09 909-250 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - CA 649C REDLANDS CA
2024-08-27 909-951 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 REDLANDS CA
2024-06-21 909-840 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHINO CA
2024-04-22 909-998 0–9 XXXall 10 · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J S BERNDINO CA
2024-03-26 909-668 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHINO CA
2024-01-29 909-526 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CLAREMONT CA
2024-01-19 909-409 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FONTANA CA
2024-01-04 909-404 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H UPLAND CA
2023-10-11 909-298 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D POMONA CA
2023-05-22 909-909 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H FONTANA CA
2022-10-17 909-819 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E UPLAND CA
2022-02-04 909-925 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CHINO CA
2021-11-16 909-848 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 REDLANDS CA
2021-10-28 909-916 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BIGBEAR LK CA
2021-08-31 909-818 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H MENTONE CA
2021-08-12 909-970 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CHINO CA
2021-05-21 909-504 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CALIMESA CA
2021-04-05 909-968 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARROWHEAD CA
2020-12-16 909-828 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2020-12-16 909-940 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 POMONA CA
2020-12-16 909-943 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 S BERNDINO CA
2020-12-16 909-956 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 S BERNDINO CA
2020-12-16 909-960 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2020-12-09 909-928 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 POMONA CA
2020-12-01 909-926 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2020-10-28 909-924 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 POMONA CA
2020-10-19 909-905 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CLAREMONT CA
2020-10-19 909-914 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E DIAMONDBAR CA
2020-10-16 909-898 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CHINO CA
2020-10-16 909-901 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CLAREMONT CA
2020-09-28 909-852 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ETIWANDA CA
2020-09-28 909-871 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MARSHALL CA
2020-09-28 909-892 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 UPLAND CA
2020-09-23 909-893 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J S BERNDINO CA
2020-09-08 909-847 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 POMONA CA
2020-09-08 909-849 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 S BERNDINO CA
2020-08-27 909-846 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARROWHEAD CA
2020-08-21 909-845 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CALIMESA CA
2020-08-07 909-836 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E REDLANDS CA
2020-08-06 909-834 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E HIGHLAND CA
2020-08-05 909-826 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 POMONA CA
2020-07-28 909-817 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 POMONA CA
2020-07-28 909-832 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2020-06-24 909-619 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E S BERNDINO CA
2020-06-18 909-830 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D CLAREMONT CA
2020-06-12 909-808 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D FONTANA CA
2020-04-08 909-791 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ARROWHEAD CA
2020-02-18 909-785 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 POMONA CA
2019-11-26 909-779 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 POMONA CA
2019-10-25 909-778 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ONTARIO CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.