NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 443-601

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 443-601 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 443 blocks

Most active assignees, all time — NPA 443
BANDWIDTH.COM CLEC, LLC - MD 4
ONVOY, LLC - MD 2
TELNYX LLC 1
PAETEC ITEL, LLC 1
CENTURYLINK COMMUNICATIONS, 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
2019-02-07 443-601-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
— 443-601-1XXX 1000–1999Reserved PAETEC ITEL, LLC 829J FALLSTON MD
2019-02-07 443-601-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2016-02-24 443-601-3XXX 3000–3999Assigned ONVOY, LLC - MD 876D FALLSTON MD
2016-02-24 443-601-4XXX 4000–4999Assigned ONVOY, LLC - MD 876D FALLSTON MD
2017-07-26 443-601-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 FALLSTON MD
2019-02-07 443-601-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON MD
2014-05-14 443-601-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J FALLSTON MD
2017-04-13 443-601-8XXX 8000–8999Assigned TELNYX LLC 073H FALLSTON MD
2015-03-27 443-601-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F FALLSTON 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.