Thousands-blocks in 443-419

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 443-419 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

PAETEC ITEL, LLC 3

ONVOY, LLC - MD 3

IP HORIZON LLC 1

CORE COMMUNICATIONS, INC.- MD 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

Recent thousands-block assignments
Assigned	Thousands-block	Last 4 digits	Status	Assignee	OCN	Rate center	State
—	443-419-0XXX	0000–0999	Reserved	PAETEC ITEL, LLC	829J	GLENWOOD	MD
2004-02-17	443-419-1XXX	1000–1999	Assigned	PAETEC ITEL, LLC	829J	GLENWOOD	MD
2004-03-01	443-419-2XXX	2000–2999	Assigned	CORE COMMUNICATIONS, INC.- MD	2593	GLENWOOD	MD
2006-03-28	443-419-3XXX	3000–3999	Assigned	PAETEC ITEL, LLC	829J	GLENWOOD	MD
2024-02-06	443-419-4XXX	4000–4999	Assigned	ONVOY, LLC - MD	876D	GLENWOOD	MD
2015-04-09	443-419-5XXX	5000–5999	Assigned	COMCAST IP PHONE, LLC	318J	GLENWOOD	MD
2016-03-09	443-419-6XXX	6000–6999	Assigned	ONVOY, LLC - MD	876D	GLENWOOD	MD
2016-03-09	443-419-7XXX	7000–7999	Assigned	ONVOY, LLC - MD	876D	GLENWOOD	MD
2015-05-18	443-419-8XXX	8000–8999	Assigned	BALTIMORE-WASHINGTON TELEPHONE (BWT)	8697	GLENWOOD	MD
2015-02-19	443-419-9XXX	9000–9999	Assigned	IP HORIZON LLC	515J	GLENWOOD	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.