NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 240-878

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

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

The ten 1,000-number thousand-blocks inside prefix 240-878 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
CORE COMMUNICATIONS, INC.- MD 5
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 2
ONVOY SPECTRUM, LLC 1
NEW CINGULAR WIRELESS PCS, LLC - DC 1
COMMIO, 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
2020-08-06 240-878-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 HAGERSTOWN MD
2021-07-20 240-878-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 HAGERSTOWN MD
2019-03-27 240-878-2XXX 2000–2999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-878-3XXX 3000–3999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-878-4XXX 4000–4999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2024-11-06 240-878-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H HAGERSTOWN MD
2017-08-04 240-878-6XXX 6000–6999Assigned COMMIO, LLC 939H HAGERSTOWN MD
2019-03-27 240-878-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2019-03-27 240-878-8XXX 8000–8999Assigned CORE COMMUNICATIONS, INC.- MD 2593 HAGERSTOWN MD
2022-12-22 240-878-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HAGERSTOWN MD

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.