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 413
LEVEL 3 COMMUNICATIONS, LLC - MA 132
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
2023-07-21 413-457-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CHICOPEE MA
2023-03-07 413-390-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2022-08-03 413-394-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LEE MA
2021-02-19 413-279-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WILBRAHAM MA
2020-05-27 413-334-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2018-09-25 413-266-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2018-02-20 413-296-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CHESTERFLD MA
2017-09-12 413-278-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2017-01-31 413-417-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2017-01-17 413-507-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2016-12-06 413-507-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2016-09-23 413-412-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NORTHADAMS MA
2016-09-21 413-217-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WILLIAMSTN MA
2016-02-17 413-203-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 EASTHAMPTN MA
2016-02-02 413-417-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2015-09-08 413-308-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 LUDLOW MA
2015-06-11 413-372-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2015-03-16 413-252-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BELCHERTN MA
2015-03-16 413-752-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRIMFIELD MA
2014-09-30 413-406-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 AMHERST MA
2014-06-11 413-930-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2014-06-04 413-517-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NORTHAMPTN MA
2014-06-04 413-553-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 PITTSFIELD MA
2014-05-14 413-372-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2013-11-06 413-372-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2013-08-14 413-420-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HOLYOKE MA
2012-10-24 413-276-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2012-07-02 413-240-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CHICOPEE MA
2012-06-29 413-318-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 ELONGMEDOW MA
2011-10-05 413-650-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HOLYOKE MA
2011-08-03 413-642-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WESTFIELD MA
2011-01-10 413-241-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2010-10-26 413-418-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 PITTSFIELD MA
2010-07-01 413-241-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2010-02-26 413-304-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2008-11-25 413-349-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HATFIELD MA
2008-11-07 413-258-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SANDISFLD MA
2008-11-07 413-842-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DALTON MA
2008-11-06 413-354-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CHESTER MA
2008-11-06 413-944-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BLANDFORD MA
2008-09-15 413-340-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WILLIAMSBG MA
2008-09-09 413-200-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CUMMINGTON MA
2008-09-09 413-207-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HUNTINGTON MA
2008-09-04 413-862-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 RUSSELL MA
2008-07-15 413-304-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SPRINGFLD MA
2008-05-16 413-357-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 GRANVILLE MA
2008-05-16 413-893-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MONSON MA
2008-05-16 413-998-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SOUTHWICK MA
2008-05-07 413-341-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NORTHAMPTN MA
2008-05-06 413-623-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BECKET MA

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.