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
2016-07-22 909-750 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ONTARIO CA
2016-07-19 909-756 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C S BERNDINO CA
2016-06-29 909-417 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E POMONA CA
2016-06-28 909-550 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2016-06-24 909-414 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C ARROWHEAD CA
2016-06-23 909-870 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C UPLAND CA
2016-06-17 909-490 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
2016-05-24 909-601 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2016-05-16 909-479 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CHINO CA
2016-05-12 909-413 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CHINO CA
2016-05-11 909-310 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C CHINO CA
2016-05-11 909-323 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C DIAMONDBAR CA
2016-05-11 909-406 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C REDLANDS CA
2016-03-07 909-403 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C RUNNINGSPG CA
2016-02-16 909-787 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C RIALTO CA
2016-02-15 909-402 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C MARSHALL CA
2016-02-09 909-757 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C ONTARIO CA
2016-01-26 909-365 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FONTANA CA
2016-01-20 909-318 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C BIGBEAR LK CA
2015-12-03 909-377 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 UPLAND CA
2015-12-03 909-497 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CHINO CA
2015-11-03 909-737 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HIGHLAND CA
2015-09-22 909-316 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CALIMESA CA
2015-09-22 909-317 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E ETIWANDA CA
2015-09-16 909-745 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 RIALTO CA
2015-09-11 909-727 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 UPLAND CA
2015-09-09 909-741 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CLAREMONT CA
2015-08-06 909-501 0–9 XXXall 10 · 4 holders which blocks → FRONTIER CALIFORNIA INC. 2319 S BERNDINO CA
2015-08-05 909-314 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 S BERNDINO CA
2015-06-23 909-655 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E DIAMONDBAR CA
2015-06-11 909-735 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 REDLANDS CA
2015-05-18 909-696 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CHINO CA
2015-05-01 909-686 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MENTONE CA
2015-04-24 909-566 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E RIALTO CA
2015-04-24 909-695 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FONTANA CA
2015-04-24 909-736 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E UPLAND CA
2015-04-14 909-734 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARROWHEAD CA
2015-04-01 909-683 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MARSHALL CA
2015-04-01 909-687 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 ONTARIO CA
2015-03-13 909-681 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2015-02-23 909-671 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 POMONA CA
2015-02-12 909-313 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHINO CA
2015-01-13 909-682 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 ARROWHEAD CA
2014-12-24 909-676 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D RIALTO CA
2014-12-23 909-656 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CLAREMONT CA
2014-12-23 909-678 0–9 XXXall 10 · 2 holders which blocks → METROPCS NETWORKS, LLC 899D ONTARIO CA
2014-12-09 909-675 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C CLAREMONT CA
2014-12-05 909-672 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C HIGHLAND CA
2014-11-25 909-665 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 S BERNDINO CA
2014-11-21 909-674 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 REDLANDS 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.