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 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
2019-10-25 909-813 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ONTARIO CA
2019-10-03 909-776 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2019-09-25 909-769 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CALIMESA CA
2019-08-26 909-739 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2019-07-16 909-780 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MARSHALL CA
2019-05-14 909-719 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2019-05-13 909-788 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H CLAREMONT CA
2019-05-13 909-858 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H CHINO CA
2019-04-02 909-712 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REDLANDS CA
2019-02-27 909-716 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 POMONA CA
2019-02-06 909-715 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CRESTLINE CA
2019-01-25 909-577 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H S BERNDINO CA
2019-01-25 909-966 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H ONTARIO CA
2019-01-25 909-977 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H FONTANA CA
2019-01-14 909-710 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ETIWANDA CA
2018-12-06 909-701 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2018-10-15 909-704 0–9 XXXall 10 · 2 holders which blocks → METROPCS NETWORKS, LLC 899D ONTARIO CA
2018-09-25 909-616 0–9 XXXall 10 · 8 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DIAMONDBAR CA
2018-09-14 909-516 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHINO CA
2018-08-06 909-513 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARROWHEAD CA
2018-07-31 909-508 not yet reported which blocks → SHELCOMM 0051 POMONA CA
2018-04-13 909-507 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D FONTANA CA
2018-03-15 909-955 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D RIALTO CA
2018-01-08 909-470 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARROWHEAD CA
2017-12-14 909-789 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ONTARIO CA
2017-09-27 909-449 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MARSHALL CA
2017-07-28 909-408 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D ONTARIO CA
2017-06-16 909-407 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 CLAREMONT CA
2017-05-22 909-401 0–9 XXXall 10 · 6 holders which blocks → METROPCS NETWORKS, LLC 899D FONTANA CA
2017-03-13 909-768 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CALIMESA CA
2017-02-10 909-738 0–9 XXXall 10 · 6 holders which blocks → METROPCS NETWORKS, LLC 899D ONTARIO CA
2017-01-17 909-761 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2017-01-09 909-775 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D FONTANA CA
2016-12-30 909-755 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 9 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K UPLAND CA
2016-11-21 909-530 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARROWHEAD CA
2016-11-21 909-602 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C REDLANDS CA
2016-11-02 909-442 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 RIALTO CA
2016-10-27 909-774 0–9 XXXall 10 · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K UPLAND CA
2016-10-10 909-679 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - CA 649C COLTON CA
2016-10-10 909-698 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C CRESTLINE CA
2016-10-10 909-729 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C POMONA CA
2016-10-10 909-760 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C DIAMONDBAR CA
2016-10-10 909-765 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C MARSHALL CA
2016-10-07 909-688 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2016-09-26 909-751 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2016-08-26 909-588 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E MENTONE CA
2016-08-22 909-505 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BIGBEAR CY CA
2016-08-05 909-640 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C RIALTO CA
2016-08-02 909-488 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E REDLANDS CA
2016-07-25 909-506 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CLAREMONT CA

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.