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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2015-09-22 657-336-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-09-22 657-336-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-09-22 657-336-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-09-22 657-336-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-09-22 657-336-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-09-17 657-500-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K FULLERTON CA
2015-09-16 657-257-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2015-09-16 657-257-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2015-09-16 657-257-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2015-09-16 657-257-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 WESTMINSTR CA
2015-09-16 657-291-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ORANGE CA
2015-09-15 657-259-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2015-09-15 657-259-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HUNTITNBCH CA
2015-09-14 657-259-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2015-09-14 657-259-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HUNTITNBCH CA
2015-09-11 657-257-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2015-09-11 657-257-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2015-09-11 657-259-1XXX 1000–1999Assigned IP HORIZON LLC 515J HUNTITNBCH CA
2015-09-11 657-286-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BREA CA
2015-09-11 657-286-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BREA CA
2015-09-11 657-291-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ORANGE CA
2015-09-11 657-291-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ORANGE CA
2015-09-11 657-291-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ORANGE CA
2015-09-11 657-291-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ORANGE CA
2015-09-11 657-294-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA ANA CA
2015-09-11 657-294-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA ANA CA
2015-09-11 657-294-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA ANA CA
2015-09-11 657-294-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SANTA ANA CA
2015-09-08 657-271-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2015-09-08 657-271-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 WESTMINSTR CA
2015-09-08 657-281-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ORANGE CA
2015-09-08 657-293-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SILVERADO CA
2015-09-08 657-293-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 SILVERADO CA
2015-09-08 657-293-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SILVERADO CA
2015-08-28 657-293-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SILVERADO CA
2015-08-28 657-293-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SILVERADO CA
2015-08-28 657-293-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SILVERADO CA
2015-08-26 657-259-0XXX 0000–0999Assigned TWC IP ENABLED SERVICES, LLC 793K HUNTITNBCH CA
2015-08-26 657-275-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 PLACENTIA CA
2015-08-26 657-281-4XXX 4000–4999Assigned PAETEC ITEL, LLC 829J ORANGE CA
2015-08-21 657-246-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BREA CA
2015-08-21 657-246-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BREA CA
2015-08-21 657-271-1XXX 1000–1999Assigned IP HORIZON LLC 515J WESTMINSTR CA
2015-08-21 657-363-0XXX 0000–0999Assigned IP HORIZON LLC 515J YORBALINDA CA
2015-08-17 657-285-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-08-17 657-285-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-08-17 657-285-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-08-17 657-285-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-08-17 657-285-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA CA
2015-08-17 657-285-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SANTA ANA 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.