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 562
FRONTIER CALIFORNIA INC. 158
T-MOBILE USA, INC. 99
NEW CINGULAR WIRELESS PCS, LLC 78
ONVOY, LLC - CA 45
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 45
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
2020-12-09 562-527 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONG BEACH CA
2020-12-08 562-561 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C WHITTIER CA
2020-12-04 562-523 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
2020-11-13 562-517 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONG BEACH CA
2020-10-28 562-515 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONG BEACH CA
2020-09-23 562-560 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J LONG BEACH CA
2020-09-21 562-525 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DOWNEY CA
2020-09-08 562-518 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONG BEACH CA
2020-08-05 562-514 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONG BEACH CA
2020-07-10 562-844 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H ALAMITOS CA
2020-07-10 562-955 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H DOWNEY CA
2020-05-27 562-488 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H ALAMITOS CA
2020-05-27 562-855 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H LONG BEACH CA
2020-05-27 562-966 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H DOWNEY CA
2020-02-10 562-487 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONG BEACH CA
2020-02-05 562-459 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
2019-12-24 562-476 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALAMITOS CA
2019-08-27 562-410 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 NORWALK CA
2019-07-16 562-509 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALAMITOS CA
2019-05-22 562-504 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WHITTIER CA
2019-04-29 562-512 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LONG BEACH CA
2019-03-15 562-414 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D DOWNEY CA
2018-09-27 562-399 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DOWNEY CA
2018-08-23 562-486 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LONG BEACH CA
2018-08-03 562-390 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DOWNEY CA
2018-07-31 562-389 not yet reported which blocks → SHELCOMM 0051 ALAMITOS CA
2018-06-21 562-380 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LONG BEACH CA
2018-03-22 562-725 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALAMITOS CA
2018-03-20 562-702 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D ALAMITOS CA
2017-12-15 562-825 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALAMITOS CA
2017-08-22 562-379 0–9 XXXall 10 · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K NORWALK CA
2017-07-27 562-359 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DOWNEY CA
2017-01-19 562-378 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WHITTIER CA
2017-01-13 562-358 0–9 XXXall 10 · 6 holders which blocks → METROPCS NETWORKS, LLC 899D WHITTIER CA
2016-12-19 562-588 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ALAMITOS CA
2016-11-15 562-471 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
2016-11-14 562-306 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
2016-09-02 562-337 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LONG BEACH CA
2016-04-29 562-302 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
2016-03-04 562-269 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LONG BEACH CA
2016-02-26 562-210 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 NORWALK CA
2016-02-23 562-474 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K NORWALK CA
2016-02-05 562-203 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C WHITTIER CA
2015-11-17 562-632 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WHITTIER CA
2015-10-08 562-454 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DOWNEY CA
2015-10-08 562-526 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 NORWALK CA
2015-09-04 562-386 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ALAMITOS CA
2015-08-26 562-362 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
2015-07-29 562-349 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LONG BEACH CA
2015-06-11 562-583 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS 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.