NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 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, all time — NPA 408
BANDWIDTH.COM CLEC, LLC - CA 411
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 287
LEVEL 3 COMMUNICATIONS, LLC - CA 262
NEW CINGULAR WIRELESS PCS, LLC 243
T-MOBILE USA, INC. 230
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
2018-09-13 408-544-9XXX 9000–9999Assigned METROPCS, INC. 5562 SNJS NORTH CA
2018-08-23 408-362-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2018-08-17 408-882-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C SNJS WEST CA
2018-08-17 408-882-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C SNJS WEST CA
2018-08-15 408-275-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS WEST CA
2018-08-02 408-944-5XXX 5000–5999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNJS NORTH CA
2018-07-19 408-970-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNJS WEST CA
2018-07-12 408-764-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS WEST CA
2018-07-03 408-856-7XXX 7000–7999Assigned INTEGRATED PATH COMMUNICATIONS, LLC - CA 707H SNJS NORTH CA
2018-04-30 408-882-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS WEST CA
2018-03-16 408-361-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS SOUTH CA
2018-03-16 408-704-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS WEST CA
2018-02-13 408-495-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS WEST CA
2018-02-13 408-517-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS WEST CA
2018-02-13 408-556-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS WEST CA
2017-12-15 408-760-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNJS WEST CA
2017-12-15 408-760-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNJS WEST CA
2017-12-15 408-760-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNJS WEST CA
2017-12-12 408-495-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS WEST CA
2017-12-12 408-495-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS WEST CA
2017-12-11 408-760-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNJS WEST CA
2017-12-11 408-760-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNJS WEST CA
2017-12-11 408-760-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNJS WEST CA
2017-12-11 408-760-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNJS WEST CA
2017-12-05 408-622-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2017-09-22 408-750-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2017-08-14 408-495-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2017-08-14 408-495-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2017-08-14 408-745-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUNNYVALE CA
2017-05-23 408-357-2XXX 2000–2999Assigned TELNYX LLC 073H LOS GATOS CA
2017-03-22 408-664-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUNNYVALE CA
2017-03-13 408-618-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2016-10-06 408-752-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C SUNNYVALE CA
2016-09-16 408-752-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SUNNYVALE CA
2016-08-29 408-721-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUNNYVALE CA
2016-08-29 408-734-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUNNYVALE CA
2016-08-25 408-721-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SUNNYVALE CA
2016-08-18 408-878-9XXX 9000–9999Assigned IP HORIZON LLC 515J SNJS WEST CA
2016-08-15 408-721-8XXX 8000–8999Assigned IP HORIZON LLC 515J SUNNYVALE CA
2016-08-15 408-897-8XXX 8000–8999Assigned IP HORIZON LLC 515J SANANTONIO CA
2016-08-08 408-326-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNJS WEST CA
2016-08-08 408-752-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SUNNYVALE CA
2016-08-04 408-493-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2016-08-04 408-941-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 SNJS NORTH CA
2016-08-02 408-861-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNJS WEST CA
2016-08-02 408-878-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J SNJS WEST CA
2016-07-26 408-721-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUNNYVALE CA
2016-07-26 408-721-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUNNYVALE CA
2016-07-26 408-721-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUNNYVALE CA
2016-07-26 408-721-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SUNNYVALE 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.