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 561
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 75
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
2016-07-08 561-617-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2016-06-30 561-657-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2015-08-27 561-618-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2014-12-05 561-614-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2014-12-03 561-570-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2014-03-19 561-571-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2013-09-16 561-469-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2013-09-16 561-469-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2013-09-16 561-469-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2013-02-27 561-402-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2012-08-31 561-405-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2012-08-31 561-405-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2011-10-31 561-962-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2011-09-14 561-223-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2011-05-23 561-328-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2011-02-09 561-600-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOYNTONBCH FL
2010-12-06 561-293-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2010-12-06 561-293-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2010-10-08 561-206-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2010-10-08 561-953-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2010-06-21 561-666-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 DELRAY BCH FL
2010-05-12 561-880-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOYNTONBCH FL
2009-12-14 561-952-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BELLEGLADE FL
2009-12-07 561-246-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2009-12-07 561-246-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2009-10-27 561-526-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 DELRAY BCH FL
2009-10-06 561-287-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2009-10-06 561-287-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2009-06-01 561-801-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2008-11-14 561-623-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2008-07-10 561-910-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2008-04-22 561-692-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BELLEGLADE FL
2008-04-22 561-972-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 JUPITER FL
2008-03-10 561-771-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 PAHOKEE FL
2007-10-15 561-768-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 JUPITER FL
2007-07-24 561-300-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2007-04-10 561-665-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 DELRAY BCH FL
2007-04-10 561-665-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 DELRAY BCH FL
2007-01-19 561-370-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2007-01-19 561-370-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2006-12-04 561-200-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOYNTONBCH FL
2006-10-19 561-424-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOYNTONBCH FL
2006-10-11 561-886-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2006-07-12 561-623-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 WPALMBEACH FL
2005-09-28 561-771-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 PAHOKEE FL
2005-06-27 561-244-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOYNTONBCH FL
2005-06-27 561-244-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOYNTONBCH FL
2005-06-27 561-300-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2005-06-27 561-300-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL
2005-06-27 561-300-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - FL 8664 BOCA RATON FL

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.