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 863
MCI WORLDCOM COMMUNICATIONS, INC. - FL 54
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
2022-01-24 863-329-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2017-02-15 863-265-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 MOOREHAVEN FL
2014-07-09 863-703-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 INDIANLAKE FL
2013-11-26 863-417-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 FROSTPROOF FL
2013-06-26 863-486-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 BOWLNGGREN FL
2012-11-30 863-734-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKE WALES FL
2011-07-11 863-344-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 FORT MEADE FL
2011-01-25 863-279-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2011-01-14 863-279-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2010-06-14 863-473-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WAUCHULA FL
2009-12-14 863-229-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2008-07-02 863-659-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKEPLACID FL
2008-04-25 863-808-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2007-05-07 863-438-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HAINESCITY FL
2007-05-07 863-450-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2007-05-07 863-517-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LABELLE FL
2007-05-07 863-837-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2007-05-07 863-844-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 MULBERRY FL
2007-05-07 863-874-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 POLK CITY FL
2007-04-10 863-354-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 MULBERRY FL
2007-04-10 863-638-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKE WALES FL
2007-04-10 863-638-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKE WALES FL
2007-04-03 863-784-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 AVON PARK FL
2007-03-23 863-263-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ARCADIA FL
2007-03-23 863-451-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 SEBRING FL
2007-03-23 863-623-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 OKEECHOBEE FL
2007-02-27 863-868-0XXX 0000–0999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2007-02-27 863-868-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2007-01-29 863-353-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HAINESCITY FL
2006-08-17 863-508-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2006-08-17 863-508-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2006-08-15 863-868-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2006-03-31 863-969-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2006-03-13 863-969-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2005-12-08 863-852-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HAINESCITY FL
2005-10-31 863-852-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HAINESCITY FL
2005-10-13 863-868-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2005-10-13 863-868-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2005-10-07 863-248-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2005-10-07 863-248-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2005-08-16 863-969-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2005-08-12 863-868-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2005-06-29 863-868-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2005-06-23 863-229-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2005-06-22 863-248-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2005-06-22 863-248-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2005-06-22 863-943-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 MULBERRY FL
2005-05-24 863-307-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTER HVN FL
2005-05-24 863-868-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKELAND FL
2004-12-10 863-455-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 LAKE WALES 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.