NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

7 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 628
EXIANT COMMUNICATIONS LLC 3
ONVOY, LLC - CA 2
TELNYX LLC 1
OPENTACT INC. 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
2018-05-22 628-561-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C STNSN-BLNS CA
2018-05-16 628-263-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNFC CNTRL CA
2018-05-16 628-263-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 SNFC CNTRL CA
2018-05-10 628-260-9XXX 9000–9999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC CNTRL CA
2018-05-08 628-280-7XXX 7000–7999Assigned METROPCS, INC. 5562 SNFC MT-EV CA
2018-05-02 628-280-2XXX 2000–2999Assigned SONIC TELECOM, LLC - CA 433E SNFC MT-EV CA
2018-05-01 628-258-1XXX 1000–1999Assigned TELNYX LLC 073H NICASIO CA
2018-05-01 628-561-1XXX 1000–1999Assigned TELNYX LLC 073H STNSN-BLNS CA
2018-04-17 628-260-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-04-04 628-258-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E NICASIO CA
2018-03-27 628-273-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-273-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-274-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-27 628-275-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2018-03-07 628-240-7XXX 7000–7999Assigned SONIC TELECOM, LLC - CA 433E SAN RAFAEL CA
2018-03-06 628-363-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC JUNPR CA
2018-03-02 628-230-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2018-03-02 628-230-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2018-02-23 628-262-1XXX 1000–1999Assigned EXIANT COMMUNICATIONS LLC 114J BELVEDERE CA
2018-02-16 628-561-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F STNSN-BLNS CA
2018-01-29 628-260-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC CNTRL CA
2018-01-18 628-230-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC CNTRL CA
2018-01-09 628-250-8XXX 8000–8999Assigned SONIC TELECOM, LLC - CA 433E SNFC JUNPR CA
2018-01-05 628-209-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 NOVATO 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.