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 815
LEVEL 3 COMMUNICATIONS, LLC - IL 176
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
2022-03-24 815-443-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PEARL CITY IL
2022-03-24 815-449-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DAKOTA IL
2022-03-24 815-563-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CEDARVILLE IL
2022-03-24 815-571-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 SHANNON IL
2022-03-24 815-576-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 POLO IL
2022-03-24 815-598-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MASSBACH IL
2022-03-24 815-789-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ORANGEVL IL
2022-03-24 815-849-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 SUBLETTE IL
2022-03-24 815-868-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MCCONNELL IL
2022-03-24 815-951-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 AMBOY IL
2022-03-24 815-989-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PROPHETSTN IL
2022-02-01 815-902-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 THOMSON IL
2022-01-31 815-400-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MORRISON IL
2022-01-31 815-554-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 E DUBUQUE IL
2022-01-31 815-855-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MILLEDGEVL IL
2022-01-31 815-897-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 LYNDON IL
2022-01-31 815-913-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHADWICK IL
2021-06-22 815-565-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 SAVANNA IL
2021-06-22 815-906-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MT CARROLL IL
2021-01-30 815-492-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 APPLERIVER IL
2021-01-30 815-591-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 HANOVER IL
2021-01-30 815-845-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 SCALESMOND IL
2020-06-11 815-251-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 NELSON IL
2020-04-09 815-858-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELIZABETH IL
2020-04-09 815-947-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 STOCKTON IL
2019-07-11 815-766-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DE KALB IL
2019-07-11 815-766-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DE KALB IL
2019-07-11 815-981-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DE KALB IL
2019-06-10 815-595-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 OREGON IL
2019-06-10 815-824-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 SHABBONA IL
2018-09-10 815-239-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 PECATONICA IL
2017-11-20 815-862-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 RICHMOND IL
2017-06-29 815-889-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 MILFORD IL
2017-06-29 815-984-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 WELLINGTON IL
2016-06-24 815-208-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 FULTON IL
2015-07-27 815-766-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 DE KALB IL
2015-05-26 815-495-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 LELAND IL
2014-12-17 815-652-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GRANDDTOUR IL
2014-07-07 815-522-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 KIRKLAND IL
2014-06-05 815-580-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHERRY VLY IL
2013-06-11 815-718-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 STERLING IL
2012-09-04 815-457-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CISSNAPARK IL
2012-03-06 815-650-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 FREEPORT IL
2012-02-15 815-496-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 SHERIDAN IL
2012-02-03 815-534-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 FRANKFORT IL
2011-08-08 815-656-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 FREEPORT IL
2011-04-20 815-373-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 ELWOOD IL
2011-03-10 815-310-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 UTICA IL
2011-03-10 815-975-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 BELVIDERE IL
2011-03-03 815-402-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IL 6115 GALENA IL

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.