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 781
LEVEL 3 COMMUNICATIONS, LLC - MA 140
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
2017-04-10 781-701-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
2016-10-03 781-703-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
2012-08-03 781-786-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
2012-03-14 781-996-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
2012-01-18 781-328-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BURLINGTON MA
2011-09-16 781-352-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NORWOOD MA
2011-09-08 781-780-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LYNN MA
2011-03-24 781-780-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LYNN MA
2009-11-16 781-609-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
2009-11-16 781-609-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
2009-09-30 781-836-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HINGHAM MA
2008-07-16 781-277-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WEYMOUTH MA
2008-05-02 781-281-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WOBURN MA
2008-05-01 781-695-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 STOUGHTON MA
2008-04-16 781-333-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MALDEN MA
2008-03-07 781-341-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 STOUGHTON MA
2008-02-05 781-257-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LINCOLN MA
2008-02-05 781-296-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
2008-02-04 781-262-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BURLINGTON MA
2008-02-04 781-315-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 READING MA
2008-02-04 781-348-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRAINTREE MA
2008-02-04 781-348-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRAINTREE MA
2008-02-04 781-518-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MEDFORD MA
2008-01-22 781-428-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRAINTREE MA
2008-01-21 781-205-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 READING MA
2008-01-21 781-209-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
2008-01-21 781-257-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LINCOLN MA
2008-01-17 781-353-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRAINTREE MA
2008-01-16 781-694-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WELLESLEY MA
2007-03-22 781-728-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LINCOLN MA
2006-11-16 781-319-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MARSHFIELD MA
2006-11-16 781-517-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MELROSE MA
2006-10-24 781-989-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CANTON MA
2006-08-22 781-840-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 STOUGHTON MA
2006-07-31 781-483-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 ARLINGTON MA
2006-07-11 781-497-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WOBURN MA
2006-05-23 781-618-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WHITMAN MA
2006-04-28 781-214-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HULL MA
2006-04-28 781-285-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DUXBURY MA
2006-04-28 781-499-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HANOVER MA
2006-04-17 781-406-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LYNNFIELD MA
2006-04-17 781-519-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRAINTREE MA
2006-04-17 781-519-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRAINTREE MA
2006-04-17 781-561-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NORWELL MA
2006-04-13 781-218-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WINCHESTER MA
2006-04-13 781-558-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SAUGUS MA
2006-03-31 781-253-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SHARON MA
2006-03-13 781-347-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 ROCKLAND MA
2006-03-13 781-451-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WAKEFIELD MA
2006-02-27 781-754-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRYANTVL MA

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.