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
2014-01-31 657-231-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J SANTA ANA CA
2014-01-24 657-233-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C GARDEN GRV CA
2014-01-06 657-845-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HUNTITNBCH CA
2013-12-31 657-231-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C SANTA ANA CA
2013-12-05 657-232-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANTA ANA CA
2013-11-27 657-223-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ORANGE CA
2013-11-27 657-232-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2013-11-27 657-232-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2013-11-26 657-667-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GARDEN GRV CA
2013-11-08 657-232-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2013-11-06 657-232-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2013-11-01 657-232-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2013-11-01 657-232-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C SANTA ANA CA
2013-10-31 657-500-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C FULLERTON CA
2013-10-31 657-500-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FULLERTON CA
2013-10-31 657-667-5XXX 5000–5999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J GARDEN GRV CA
2013-10-31 657-845-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2013-10-31 657-845-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C HUNTITNBCH CA
2013-10-18 657-232-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2013-10-18 657-232-1XXX 1000–1999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2013-10-15 657-218-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K SANTA ANA CA
2013-10-04 657-444-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PLACENTIA CA
2013-09-25 657-223-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ORANGE CA
2013-09-17 657-241-0XXX 0000–0999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-1XXX 1000–1999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-2XXX 2000–2999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-3XXX 3000–3999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-4XXX 4000–4999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-5XXX 5000–5999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-6XXX 6000–6999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-7XXX 7000–7999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-8XXX 8000–8999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-09-17 657-241-9XXX 9000–9999Assigned PAETEC COMMUNICATIONS, INC. - CA 4733 HUNTITNBCH CA
2013-08-26 657-218-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SANTA ANA CA
2013-08-26 657-666-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C WESTMINSTR CA
2013-08-23 657-223-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C ORANGE CA
2013-08-23 657-667-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C GARDEN GRV CA
2013-08-02 657-221-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ORANGE CA
2013-06-19 657-218-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2013-06-13 657-218-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2013-06-13 657-223-9XXX 9000–9999Assigned TWC IP ENABLED SERVICES, LLC 793K ORANGE CA
2013-06-10 657-845-7XXX 7000–7999Assigned TWC IP ENABLED SERVICES, LLC 793K HUNTITNBCH CA
2013-06-05 657-218-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2013-06-05 657-900-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2013-05-24 657-220-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2013-05-24 657-220-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ANAHEIM CA
2013-05-15 657-900-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANTA ANA CA
2013-05-08 657-220-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2013-05-08 657-221-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE CA
2013-05-08 657-221-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ORANGE 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.