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 508
LEVEL 3 COMMUNICATIONS, LLC - MA 206
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
2022-06-16 508-595-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WORCESTER MA
2013-08-23 508-449-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MARLBORO MA
2013-04-24 508-630-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MARLBORO MA
2012-10-24 508-502-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WORCESTER MA
2012-08-03 508-203-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FOXBORO MA
2010-10-26 508-232-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BROCKTON MA
2008-11-07 508-251-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MARLBORO MA
2008-09-09 508-657-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BELLINGHAM MA
2008-09-04 508-315-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NATICK MA
2008-08-27 508-499-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 OXFORD MA
2008-08-27 508-657-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BELLINGHAM MA
2008-08-01 508-329-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WESTBORO MA
2008-05-06 508-276-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WAYLAND MA
2008-05-06 508-422-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MILFORD MA
2008-05-02 508-371-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FRAMINGHAM MA
2008-04-17 508-591-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 PLYMOUTH MA
2008-04-17 508-858-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NEWBEDFORD MA
2008-04-16 508-734-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALPOLE MA
2008-04-16 508-917-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MILLBURY MA
2008-02-04 508-283-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FRAMINGHAM MA
2008-02-04 508-283-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FRAMINGHAM MA
2008-02-04 508-928-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BLACKSTONE MA
2008-01-31 508-948-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WESTBORO MA
2008-01-22 508-928-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BLACKSTONE MA
2008-01-21 508-283-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FRAMINGHAM MA
2008-01-21 508-556-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WORCESTER MA
2007-10-23 508-869-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOYLSTON MA
2007-10-16 508-644-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 ASSONET MA
2007-06-08 508-762-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WORCESTER MA
2007-02-08 508-635-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WORCESTER MA
2007-02-07 508-242-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MEDFIELD MA
2006-11-10 508-465-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CARVER MA
2006-10-12 508-785-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 DOVER MA
2006-08-30 508-466-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NORTHBORO MA
2006-08-23 508-603-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 UPTON MA
2006-08-18 508-219-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 EASTON MA
2006-08-18 508-298-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FRANKLIN MA
2006-08-18 508-772-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FOXBORO MA
2006-08-07 508-210-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HOLDEN MA
2006-07-26 508-762-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WORCESTER MA
2006-07-12 508-969-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FRAMINGHAM MA
2006-06-19 508-257-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SIASCONSET MA
2006-06-19 508-503-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 PLYMOUTH MA
2006-06-08 508-882-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 OAKHAM MA
2006-05-23 508-213-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WEBSTER MA
2006-05-22 508-939-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 EDGARTOWN MA
2006-04-28 508-276-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WAYLAND MA
2006-04-28 508-338-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 VINEYRDHVN MA
2006-04-28 508-779-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 UXBRIDGE MA
2006-04-28 508-812-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NO SWANSEA MA

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.