NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 443-914

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 443-914 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
PEERLESS NETWORK OF MARYLAND, LLC 2
BANDWIDTH.COM CLEC, LLC - MD 2
TELEPORT COMMUNICATIONS AMERICA, LLC - MD 1
PAETEC ITEL, LLC 1
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 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
2002-11-04 443-914-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WORTHINGTN MD
2003-12-16 443-914-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J WORTHINGTN MD
2014-06-11 443-914-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WORTHINGTN MD
2015-06-09 443-914-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MD 071F WORTHINGTN MD
2017-03-16 443-914-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WORTHINGTN MD
2015-05-27 443-914-5XXX 5000–5999Assigned BALTIMORE-WASHINGTON TELEPHONE (BWT) 8697 WORTHINGTN MD
2014-05-23 443-914-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J WORTHINGTN MD
2013-04-05 443-914-7XXX 7000–7999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WORTHINGTN MD
2013-04-05 443-914-8XXX 8000–8999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G WORTHINGTN MD
— 443-914-9XXX 9000–9999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 WORTHINGTN 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.