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
Clear Download CSV ↓
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 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.