NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 240-260

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 240-260 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
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 4
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 2
CORE COMMUNICATIONS, INC.- MD 2
METROPCS, INC. 1
COMCAST IP PHONE, 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
— 240-260-0XXX 0000–0999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z14 MD
— 240-260-1XXX 1000–1999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z14 MD
— 240-260-2XXX 2000–2999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z14 MD
2017-10-10 240-260-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WSNG236Z14 MD
— 240-260-4XXX 4000–4999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNG236Z14 MD
2018-10-11 240-260-5XXX 5000–5999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2018-10-11 240-260-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 WSNG236Z14 MD
2017-09-07 240-260-7XXX 7000–7999Assigned METROPCS, INC. 5562 WSNG236Z14 MD
2018-09-24 240-260-8XXX 8000–8999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNG236Z14 MD
2023-05-31 240-260-9XXX 9000–9999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSNG236Z14 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.