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 256
LEVEL 3 COMMUNICATIONS, LLC - AL 142
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2023-10-17 256-717-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 RAINSVILLE AL
2023-10-17 256-868-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HENAGAR AL
2023-05-02 256-706-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 CROSSVILLE AL
2023-03-24 256-994-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 DECATUR AL
2023-03-24 256-994-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 DECATUR AL
2023-01-25 256-923-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 CENTRE AL
2022-12-12 256-818-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 FRANCISCO AL
2022-04-05 256-681-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 MORGANCITY AL
2022-04-05 256-951-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 ARAB AL
2022-02-15 256-562-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2021-11-16 256-900-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 GADSDEN AL
2021-10-18 256-987-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 GRAYSON AL
2021-03-26 256-865-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 ASHLAND AL
2020-10-27 256-807-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HEFLIN AL
2019-09-11 256-870-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 MADISON AL
2019-02-25 256-692-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2019-02-14 256-670-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 BRIDGEPORT AL
2018-05-23 256-575-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 SCOTTSBORO AL
2018-05-15 256-678-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2016-11-22 256-963-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2016-03-17 256-964-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2015-11-10 256-937-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2015-10-20 256-898-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 DECATUR AL
2015-10-20 256-952-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 GADSDEN AL
2015-09-23 256-801-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2015-07-29 256-929-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2015-06-23 256-801-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2014-12-29 256-455-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 ALBERTVL AL
2014-04-10 256-774-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 MADISON AL
2014-04-07 256-608-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 STEVENSON AL
2014-03-26 256-712-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 FLORENCE AL
2014-02-28 256-517-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2014-02-26 256-254-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 MENTONE AL
2014-02-26 256-357-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 WEDOWEE AL
2014-02-26 256-363-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 MRNSCRSRDS AL
2014-02-26 256-396-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 LINEVILLE AL
2014-02-26 256-449-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 WOODLAND AL
2014-02-26 256-662-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 VALLEYHEAD AL
2014-02-26 256-748-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 LECTA AL
2014-02-26 256-914-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 WADLEY AL
2014-02-25 256-253-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 CHULAFINNE AL
2014-02-25 256-402-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 DELTA AL
2014-02-24 256-377-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 ROCKFORD AL
2014-01-08 256-278-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 ATHENS AL
2014-01-03 256-964-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2013-12-04 256-203-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 HUNTSVILLE AL
2013-10-01 256-333-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 RED BAY AL
2013-09-09 256-242-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 SECTION AL
2013-09-09 256-257-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 FALKVILLE AL
2013-09-09 256-380-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AL 5255 SKYLINE AL

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.