NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

37 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2014-08-28 657-237-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2014-08-28 657-243-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FULLERTON CA
2014-08-27 657-237-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2014-08-27 657-237-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2014-08-27 657-245-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2014-08-27 657-245-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2014-08-26 657-238-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2014-08-26 657-238-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C CYPRESS CA
2014-08-26 657-529-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C BUENA PARK CA
2014-08-25 657-227-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2014-08-21 657-236-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C ORANGE CA
2014-08-21 657-236-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C ORANGE CA
2014-08-21 657-251-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2014-08-18 657-237-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2014-08-18 657-237-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2014-08-13 657-236-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J ORANGE CA
2014-08-07 657-243-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FULLERTON CA
2014-08-07 657-667-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 GARDEN GRV CA
2014-08-05 657-230-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2014-07-30 657-237-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2014-07-30 657-245-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C SANTA ANA CA
2014-07-24 657-237-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HUNTITNBCH CA
2014-07-23 657-242-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2014-07-21 657-243-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2014-07-21 657-243-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2014-07-21 657-243-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FULLERTON CA
2014-07-10 657-236-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ORANGE CA
2014-07-10 657-236-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ORANGE CA
2014-07-10 657-237-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2014-07-10 657-242-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2014-07-10 657-242-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2014-07-10 657-242-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2014-07-10 657-245-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2014-07-10 657-245-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2014-07-10 657-383-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2014-06-26 657-238-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CYPRESS CA
2014-06-24 657-226-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLACENTIA CA
2014-06-17 657-238-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J CYPRESS CA
2014-06-17 657-242-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J ANAHEIM CA
2014-06-11 657-220-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C ANAHEIM CA
2014-06-10 657-234-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2014-06-10 657-234-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2014-06-10 657-234-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2014-06-10 657-234-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2014-06-10 657-234-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2014-06-10 657-234-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2014-06-10 657-234-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E YORBALINDA CA
2014-06-06 657-218-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2014-06-05 657-237-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNTITNBCH CA
2014-06-02 657-223-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ORANGE CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.