NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

1 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 401
LEVEL 3 COMMUNICATIONS, LLC - RI 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
2026-08-26 401-535-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 W WARWICK RI
2024-04-30 401-361-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 WARWICK RI
2022-09-27 401-799-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2022-06-01 401-296-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2021-07-27 401-600-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2021-06-08 401-600-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2021-05-04 401-600-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2021-02-23 401-900-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2021-01-12 401-900-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2015-11-19 401-537-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2015-10-07 401-283-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2015-07-23 401-340-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2015-07-23 401-406-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2014-09-30 401-537-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2013-02-13 401-406-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2013-02-13 401-406-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2011-05-05 401-400-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2010-11-24 401-519-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2010-11-24 401-519-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2010-07-26 401-519-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2010-07-20 401-519-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2010-07-01 401-519-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2010-05-07 401-415-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2010-02-11 401-415-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2008-11-17 401-267-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 NO KINGSTN RI
2008-11-17 401-269-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 COVENTRY RI
2008-10-02 401-216-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 WOONSOCKET RI
2008-08-27 401-203-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 GREENWICH RI
2008-07-17 401-264-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PORTSMOUTH RI
2008-05-28 401-753-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PAWTUCKET RI
2008-05-19 401-288-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PAWTUCKET RI
2008-05-07 401-236-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 NEWPORT RI
2008-05-06 401-354-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2008-05-06 401-354-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2008-04-17 401-308-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 NARRAGNSTT RI
2008-04-16 401-250-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 W WARWICK RI
2008-04-16 401-764-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 SCITUATE RI
2008-02-05 401-244-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 WARWICK RI
2008-02-05 401-287-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 WARWICK RI
2008-02-05 401-489-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2008-02-04 401-284-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 NARRAGNSTT RI
2008-01-21 401-244-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 WARWICK RI
2007-06-08 401-536-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2007-05-14 401-256-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2006-08-23 401-626-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
2006-08-04 401-371-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PASCOAG RI
2006-08-04 401-566-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 JAMESTOWN RI
2006-04-10 401-239-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 NEWPORT RI
2006-04-10 401-309-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 WOONSOCKET RI
2006-03-31 401-566-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - RI 4016 JAMESTOWN RI

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.