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 603
LEVEL 3 COMMUNICATIONS, LLC - NH 162
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
2012-09-11 603-952-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 SALEM NH
2012-09-11 603-952-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 SALEM NH
2010-09-16 603-294-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 PORTSMOUTH NH
2010-09-14 603-370-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 CANDIA NH
2010-09-14 603-421-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 DERRY NH
2010-09-14 603-509-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 ROCHESTER NH
2010-09-14 603-609-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 DOVER NH
2010-09-03 603-217-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 BRISTOL NH
2010-09-03 603-261-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 MERRIMACK NH
2010-09-03 603-290-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 CONCORD NH
2010-09-03 603-389-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 DURHAM NH
2010-09-03 603-718-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 NASHUA NH
2010-09-03 603-782-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 MANCHESTER NH
2010-09-03 603-952-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 SALEM NH
2006-10-04 603-238-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 PLYMOUTH NH
2005-08-19 603-259-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 LITTLETON NH
2005-08-19 603-262-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 MERRIMACK NH
2005-08-19 603-317-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 MILAN NH
2005-08-19 603-353-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 ORFORD NH
2005-08-19 603-522-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 SANBORNVL NH
2005-08-19 603-565-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 PENACOOK NH
2005-08-19 603-586-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 JEFFERSON NH
2005-08-19 603-652-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 MILTON NH
2005-08-19 603-684-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 LANCASTER NH
2005-08-19 603-712-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 PIKE NH
2005-08-19 603-727-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 LEBANON NH
2005-08-19 603-728-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 NOWOODSTOK NH
2005-08-19 603-795-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 LYME NH
2005-08-19 603-865-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 NEWPORT NH
2005-08-19 603-873-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 SUNAPEE NH
2005-08-19 603-874-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 MONROE NH
2005-08-19 603-899-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 RINDGE NH
2005-08-18 603-242-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 TROY NH
2005-08-18 603-323-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 TAMWORTH NH
2005-08-18 603-399-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 WESTMORELD NH
2005-08-18 603-487-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 NEW BOSTON NH
2005-08-16 603-237-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 COLEBROOK NH
2005-08-16 603-287-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 CLAREMONT NH
2005-08-16 603-397-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 DURHAM NH
2005-08-16 603-463-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 DEERFIELD NH
2005-08-16 603-585-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 FITZWILLIM NH
2005-08-16 603-768-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 DANBURY NH
2005-08-16 603-965-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 DERRY NH
2005-08-10 603-601-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 HAMPTON NH
2005-08-02 603-546-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 NASHUA NH
2005-08-02 603-592-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 SPOFFORD NH
2005-08-02 603-821-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 NASHUA NH
2005-06-20 603-371-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 PETERBROGH NH
2005-06-20 603-371-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 PETERBROGH NH
2005-06-20 603-499-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NH 4017 KEENE NH

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.