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 240
LEVEL 3 COMMUNICATIONS, LLC - MD 219
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
2024-06-20 240-891-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2022-10-13 240-574-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FRIENDSVL MD
2022-10-03 240-759-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG238Z15 MD
2022-10-03 240-934-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 MIDDLETOWN MD
2022-09-20 240-822-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 NEW MARKET MD
2022-06-09 240-874-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 THURMONT MD
2022-02-16 240-891-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2021-12-10 240-891-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2021-10-18 240-240-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 DAMASCS240 MD
2020-11-25 240-693-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WALKERSVL MD
2020-02-20 240-591-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HAGERSTOWN MD
2020-01-23 240-594-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BITTINGER MD
2019-08-22 240-655-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 KITZMILLER MD
2019-05-30 240-692-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GRANTSVL MD
2019-05-28 240-647-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CLEAR SPG MD
2019-05-28 240-648-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 KEEDYSVL MD
2019-05-28 240-775-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WESTERNPT MD
2019-05-28 240-998-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HANCOCK MD
2018-07-20 240-637-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2018-07-20 240-637-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2018-07-20 240-637-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2018-07-20 240-637-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2018-07-20 240-637-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2017-10-04 240-569-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FLINTSTONE MD
2017-08-22 240-267-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HAGERSTOWN MD
2016-10-18 240-996-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BRUNSWICK MD
2016-09-26 240-774-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LONACONING MD
2016-09-26 240-862-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 MT SAVAGE MD
2016-09-23 240-734-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 SMITHSBURG MD
2016-09-22 240-307-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 EMMITSBURG MD
2016-09-22 240-617-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HIGHFIELD MD
2015-07-08 240-513-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HAGERSTOWN MD
2015-01-13 240-236-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FREDERICK MD
2014-10-29 240-651-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FREDERICK MD
2014-09-29 240-297-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z13 MD
2014-09-29 240-651-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FREDERICK MD
2014-08-05 240-651-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FREDERICK MD
2014-07-25 240-614-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN10 MD
2014-06-24 240-762-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
2014-06-10 240-495-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN4 MD
2014-06-10 240-762-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
2014-05-28 240-512-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG238Z13 MD
2014-05-28 240-772-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FREDERICK MD
2014-04-17 240-743-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
2014-04-02 240-839-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2014-01-22 240-608-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 FREDERICK MD
2013-12-24 240-803-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 CUMBERLAND MD
2013-10-24 240-513-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 HAGERSTOWN MD
2013-04-17 240-753-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN10 MD
2013-02-21 240-297-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNG236Z13 MD

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.