NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

37 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 657
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 36
BANDWIDTH.COM CLEC, LLC - CA 1
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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2014-10-31 657-227-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K WESTMINSTR CA
2014-10-29 657-254-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2014-10-29 657-254-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2014-10-28 657-282-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K ORANGE CA
2014-10-24 657-363-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C YORBALINDA CA
2014-10-24 657-363-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C YORBALINDA CA
2014-10-17 657-253-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2014-10-17 657-253-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2014-10-17 657-253-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FULLERTON CA
2014-10-17 657-363-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 YORBALINDA CA
2014-10-16 657-254-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2014-10-16 657-254-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2014-10-16 657-254-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ANAHEIM CA
2014-10-14 657-248-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FULLERTON CA
2014-10-14 657-248-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FULLERTON CA
2014-10-10 657-226-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLACENTIA CA
2014-10-10 657-244-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2014-10-10 657-244-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2014-10-10 657-244-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2014-10-10 657-251-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GARDEN GRV CA
2014-10-10 657-251-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GARDEN GRV CA
2014-10-10 657-251-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GARDEN GRV CA
2014-10-02 657-230-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2014-10-02 657-230-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2014-10-01 657-239-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BUENA PARK CA
2014-10-01 657-243-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C FULLERTON CA
2014-10-01 657-243-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C FULLERTON CA
2014-09-26 657-227-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 WESTMINSTR CA
2014-09-26 657-238-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CYPRESS CA
2014-09-26 657-251-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GARDEN GRV CA
2014-09-25 657-246-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BREA CA
2014-09-23 657-252-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BUENA PARK CA
2014-09-19 657-246-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C BREA CA
2014-09-19 657-246-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BREA CA
2014-09-18 657-226-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PLACENTIA CA
2014-09-17 657-244-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2014-09-17 657-529-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C BUENA PARK CA
2014-09-11 657-230-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2014-09-11 657-243-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FULLERTON CA
2014-09-11 657-245-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2014-09-11 657-251-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GARDEN GRV CA
2014-09-11 657-383-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2014-09-11 657-383-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2014-09-11 657-383-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2014-09-10 657-244-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2014-09-04 657-230-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C ANAHEIM CA
2014-09-03 657-246-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BREA CA
2014-09-02 657-226-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C PLACENTIA CA
2014-09-02 657-226-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C PLACENTIA CA
2014-08-29 657-238-4XXX 4000–4999Assigned METROPCS NETWORKS, LLC 899D CYPRESS CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.