NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 440-673

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 440-673 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 440 blocks

Most active assignees, all time — NPA 440
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 5
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 2
TERRA NOVA TELECOM INC. 1
BANDWIDTH.COM CLEC, LLC - OH 1
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
— 440-673-0XXX 0000–0999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 440-673-1XXX 1000–1999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
2023-05-24 440-673-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J CLEVELAND OH
2015-03-18 440-673-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - OH 001F CLEVELAND OH
— 440-673-4XXX 4000–4999Available CLEVELAND OH
2013-12-04 440-673-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-673-6XXX 6000–6999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
— 440-673-7XXX 7000–7999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH
2013-12-04 440-673-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CLEVELAND OH
— 440-673-9XXX 9000–9999Reserved MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 7443 CLEVELAND OH

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.