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 561
LEVEL 3 COMMUNICATIONS, LLC - FL 201
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
2022-08-09 561-872-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2022-06-08 561-873-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2022-04-28 561-849-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2022-04-28 561-849-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2019-06-18 561-473-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2019-05-31 561-560-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2019-01-23 561-770-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOYNTONBCH FL
2017-08-30 561-323-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2016-02-09 561-717-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2015-09-24 561-516-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BELLEGLADE FL
2015-07-23 561-465-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2015-07-23 561-757-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2015-07-10 561-345-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2015-07-10 561-790-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2015-02-26 561-348-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 JUPITER FL
2015-01-13 561-614-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-12-01 561-609-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2014-11-19 561-563-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2014-11-19 561-877-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOYNTONBCH FL
2014-10-16 561-609-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2014-10-16 561-609-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2014-10-16 561-612-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-10-01 561-510-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 JUPITER FL
2014-10-01 561-612-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-10-01 561-612-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-10-01 561-612-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-09-11 561-513-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-09-11 561-513-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-07-29 561-513-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-07-29 561-701-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2014-05-14 561-808-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2014-03-19 561-430-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2014-03-11 561-945-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2014-03-05 561-430-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2013-12-25 561-701-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2013-12-17 561-419-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2013-12-17 561-990-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2013-07-24 561-413-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOYNTONBCH FL
2013-07-10 561-362-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2013-06-26 561-923-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2013-06-20 561-270-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2013-02-28 561-402-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 WPALMBEACH FL
2013-01-30 561-409-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2013-01-23 561-600-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOYNTONBCH FL
2012-12-19 561-405-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL
2012-11-28 561-203-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 JUPITER FL
2012-11-15 561-257-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BELLEGLADE FL
2012-10-10 561-303-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2012-07-12 561-666-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 DELRAY BCH FL
2012-06-28 561-221-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - FL 4802 BOCA RATON FL

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.