NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 727
MCI WORLDCOM COMMUNICATIONS, INC. - FL 71
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
2022-08-10 727-594-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2022-08-10 727-594-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2022-08-10 727-594-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2019-10-18 727-296-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2017-05-04 727-685-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2015-05-05 727-315-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2015-05-05 727-315-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2013-02-28 727-333-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2013-02-28 727-333-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2012-02-24 727-202-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2011-06-10 727-828-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2011-01-14 727-264-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 NWPTRICHEY FL
2009-11-24 727-619-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HUDSON FL
2009-09-14 727-826-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2009-05-07 727-260-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2008-08-18 727-322-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2007-05-24 727-755-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HUDSON FL
2006-12-05 727-379-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HUDSON FL
2006-08-03 727-290-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2006-07-18 727-290-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2006-06-15 727-947-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TARPON SPG FL
2006-04-27 727-478-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 NWPTRICHEY FL
2006-04-27 727-478-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 NWPTRICHEY FL
2006-01-18 727-236-9XXX 9000–9999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 NWPTRICHEY FL
2006-01-12 727-236-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 NWPTRICHEY FL
2005-11-14 727-342-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-11-14 727-342-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-11-14 727-342-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-10-28 727-379-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HUDSON FL
2005-09-23 727-254-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2005-09-23 727-729-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2005-09-23 727-729-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2005-09-23 727-729-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2005-09-23 727-729-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2005-09-22 727-346-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-09-22 727-368-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-09-22 727-368-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-09-22 727-368-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-09-22 727-368-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-09-22 727-368-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-09-22 727-368-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-08-31 727-559-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2005-08-16 727-236-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 NWPTRICHEY FL
2005-08-05 727-729-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2005-08-05 727-729-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 CLEARWATER FL
2005-08-02 727-368-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-08-02 727-368-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 STPETERSBG FL
2005-06-23 727-233-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 HUDSON FL
2005-06-23 727-234-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TARPON SPG FL
2005-06-23 727-234-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TARPON SPG FL

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.