NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 240-720

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 240-720 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 240 blocks

Most active assignees, all time — NPA 240
LEVEL 3 COMMUNICATIONS, LLC - MD 4
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2
YMAX COMMUNICATIONS CORP. - MD 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 1
IP HORIZON LLC 1
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
— 240-720-0XXX 0000–0999Reserved LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
2025-05-02 240-720-1XXX 1000–1999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GAITHERSBG MD
2007-08-17 240-720-2XXX 2000–2999Assigned IP HORIZON LLC 515J GAITHERSBG MD
2007-11-20 240-720-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
2025-05-02 240-720-4XXX 4000–4999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 GAITHERSBG MD
2008-04-02 240-720-5XXX 5000–5999Assigned YMAX COMMUNICATIONS CORP. - MD 281E GAITHERSBG MD
2008-10-02 240-720-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GAITHERSBG MD
2010-09-28 240-720-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F GAITHERSBG MD
— 240-720-8XXX 8000–8999Reserved LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
— 240-720-9XXX 9000–9999Reserved LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD

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.