NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, 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
2006-10-13 408-212-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SUNNYVALE CA
2006-10-11 408-702-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUNNYVALE CA
2006-10-05 408-503-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E SNJS NORTH CA
2006-10-05 408-677-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C SNJS SOUTH CA
2006-10-05 408-722-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C MORGANHILL CA
2006-10-03 408-628-3XXX 3000–3999Assigned METROPCS, INC. 5562 CAMPBELL CA
2006-10-03 408-628-7XXX 7000–7999Assigned METROPCS, INC. 5562 CAMPBELL CA
2006-09-29 408-493-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS NORTH CA
2006-09-29 408-493-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS NORTH CA
2006-09-19 408-789-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C SUNNYVALE CA
2006-09-18 408-890-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2006-09-17 408-628-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAMPBELL CA
2006-09-14 408-594-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUNNYVALE CA
2006-09-14 408-594-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUNNYVALE CA
2006-09-14 408-685-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUNNYVALE CA
2006-09-13 408-334-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS WEST CA
2006-09-13 408-334-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS WEST CA
2006-09-13 408-890-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2006-09-13 408-890-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2006-09-13 408-890-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS NORTH CA
2006-09-06 408-890-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C SNJS NORTH CA
2006-09-01 408-334-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2006-09-01 408-677-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNJS SOUTH CA
2006-08-30 408-628-9XXX 9000–9999Assigned METROPCS, INC. 5562 CAMPBELL CA
2006-08-28 408-677-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNJS SOUTH CA
2006-08-28 408-722-9XXX 9000–9999Assigned IP HORIZON LLC 515J MORGANHILL CA
2006-08-28 408-827-9XXX 9000–9999Assigned IP HORIZON LLC 515J LOS GATOS CA
2006-08-23 408-628-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA
2006-08-22 408-533-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2006-08-22 408-533-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2006-08-22 408-556-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2006-08-22 408-649-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2006-08-22 408-660-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2006-08-22 408-844-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2006-08-22 408-922-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2006-08-18 408-542-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SUNNYVALE CA
2006-08-18 408-731-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SUNNYVALE CA
2006-08-18 408-738-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SUNNYVALE CA
2006-08-16 408-693-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS SOUTH CA
2006-08-16 408-693-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS SOUTH CA
2006-08-16 408-693-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS SOUTH CA
2006-08-16 408-693-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS SOUTH CA
2006-08-16 408-693-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS SOUTH CA
2006-08-16 408-693-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNJS SOUTH CA
2006-08-14 408-852-2XXX 2000–2999Assigned FRONTIER CALIFORNIA INC. 4420 GILROY CA
2006-08-10 408-886-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 SNJS WEST CA
2006-08-10 408-886-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2006-08-10 408-886-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2006-08-09 408-470-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUNNYVALE CA
2006-08-09 408-747-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SUNNYVALE 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.