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 813
MCI WORLDCOM COMMUNICATIONS, INC. - FL 194
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
2021-12-22 813-939-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-08-11 813-698-0XXX 0000–0999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-0XXX 0000–0999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-05-18 813-821-9XXX 9000–9999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2021-03-29 813-697-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2020-11-10 813-687-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPAWST FL
2020-10-06 813-698-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2020-10-06 813-698-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2020-10-06 813-698-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2020-10-06 813-698-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2020-10-06 813-698-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2020-10-06 813-698-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2020-10-06 813-698-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2020-10-06 813-698-9XXX 9000–9999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2019-08-02 813-683-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2018-03-07 813-462-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2017-07-27 813-437-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2016-06-15 813-619-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2016-01-22 813-607-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPANTH FL
2015-11-19 813-603-9XXX 9000–9999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPAEST FL
2015-08-07 813-660-0XXX 0000–0999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-7XXX 7000–7999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-8XXX 8000–8999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-08-07 813-660-9XXX 9000–9999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-04-07 813-586-5XXX 5000–5999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-04-07 813-586-6XXX 6000–6999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-03-05 813-906-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-03-05 813-906-4XXX 4000–4999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2015-02-09 813-559-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2014-04-01 813-603-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPAEST FL
2014-01-31 813-284-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2014-01-30 813-284-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2013-12-10 813-617-0XXX 0000–0999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2013-12-10 813-617-1XXX 1000–1999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2013-12-10 813-617-2XXX 2000–2999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN FL
2013-12-10 813-617-3XXX 3000–3999Assigned MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPACEN 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.