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 574
LEVEL 3 COMMUNICATIONS, LLC - IN 78
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
2024-06-06 574-397-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2023-08-08 574-395-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2023-05-18 574-847-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ROCHESTER IN
2023-04-27 574-381-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2022-07-28 574-666-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2022-03-29 574-378-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2021-03-22 574-766-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 CLAYPOOL IN
2021-02-05 574-544-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2018-12-04 574-521-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SYRACUSE IN
2016-03-29 574-214-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ELKHART IN
2016-03-10 574-347-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2015-09-01 574-306-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WARSAW IN
2015-07-07 574-314-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2014-09-29 574-218-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ELKHART IN
2014-07-03 574-664-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 TWELVEMILE IN
2014-05-23 574-208-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2014-05-23 574-516-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 LOGANSPORT IN
2014-03-24 574-688-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 PIERCETON IN
2014-03-24 574-804-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 NO LIBERTY IN
2014-03-21 574-348-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 HAMLET IN
2013-12-19 574-401-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2013-10-17 574-626-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WALTON IN
2013-07-23 574-598-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 AKRON IN
2013-03-13 574-807-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2013-03-04 574-914-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 PLYMOUTH IN
2012-12-19 574-350-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ELKHART IN
2012-05-31 574-376-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WARSAW IN
2012-05-16 574-808-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MONTICELLO IN
2012-03-02 574-400-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2012-01-27 574-328-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 BURKET IN
2011-10-28 574-349-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 GOSHEN IN
2011-10-20 574-707-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 OSCEOLA IN
2011-05-11 574-575-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ELKHART IN
2011-03-30 574-208-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2011-01-20 574-367-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2010-11-03 574-208-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2010-07-30 574-307-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2009-10-29 574-310-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2008-07-15 574-343-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ELKHART IN
2008-01-22 574-485-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2008-01-14 574-231-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SOUTH BEND IN
2006-06-28 574-328-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 BURKET IN
2006-04-07 574-584-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ELKHART IN
2005-12-28 574-808-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MONTICELLO IN
2005-08-09 574-538-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 GOSHEN IN
2005-05-18 574-516-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 LOGANSPORT IN
2005-05-02 574-584-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ELKHART IN
2005-03-08 574-248-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 BREMEN IN
2005-03-08 574-306-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WARSAW IN
2005-03-08 574-821-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MIDDLEBURY IN

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.