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 407
MCI WORLDCOM COMMUNICATIONS, INC. - FL 77
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
2019-10-24 407-714-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTERPARK FL
2018-03-30 407-638-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 SANFORD FL
2016-01-14 407-548-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 SANFORD FL
2016-01-14 407-548-9XXX 9000–9999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 SANFORD FL
2013-05-16 407-442-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 EASTORANGE FL
2011-10-14 407-289-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2011-10-14 407-289-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2011-05-20 407-261-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTERPARK FL
2010-10-19 407-655-0XXX 0000–0999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 KISSIMMEE FL
2010-10-19 407-655-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 KISSIMMEE FL
2010-10-19 407-655-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 KISSIMMEE FL
2010-10-19 407-655-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 KISSIMMEE FL
2010-10-19 407-655-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 KISSIMMEE FL
2010-03-03 407-674-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2009-08-17 407-369-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2009-06-22 407-391-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 SANFORD FL
2009-06-17 407-790-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTERPARK FL
2008-10-27 407-442-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 EASTORANGE FL
2008-10-21 407-536-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2008-10-21 407-536-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2008-06-16 407-259-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2008-06-16 407-259-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2008-06-16 407-429-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2008-06-16 407-429-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2007-10-22 407-964-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CELEBRATN FL
2007-04-13 407-358-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 APOPKA FL
2007-04-10 407-218-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2007-04-10 407-218-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2007-04-10 407-218-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2007-04-10 407-218-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2007-01-19 407-442-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 EASTORANGE FL
2006-11-09 407-358-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 APOPKA FL
2006-07-24 407-373-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2006-07-24 407-373-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2006-06-21 407-452-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 KISSIMMEE FL
2006-06-21 407-520-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 KISSIMMEE FL
2006-06-15 407-567-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2006-06-15 407-803-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2006-06-15 407-982-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2006-06-12 407-287-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 WINTERGRDN FL
2006-03-10 407-710-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 SANFORD FL
2006-03-10 407-710-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 SANFORD FL
2006-01-16 407-498-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ST CLOUD FL
2005-12-08 407-552-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 KISSIMMEE FL
2005-11-15 407-454-9XXX 9000–9999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2005-11-15 407-803-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2005-11-15 407-803-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2005-11-15 407-803-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2005-11-15 407-803-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2005-10-11 407-454-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO 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.