NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 443-708

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 443-708 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
COMCAST IP PHONE, LLC 8
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 1
LEVEL 3 TELECOM OF MARYLAND, 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
2006-11-16 443-708-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-11-16 443-708-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-11-16 443-708-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-11-16 443-708-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-11-16 443-708-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2006-11-16 443-708-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2008-03-20 443-708-6XXX 6000–6999Assigned OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 BALTIMORE MD
2007-09-10 443-708-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2007-09-10 443-708-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
— 443-708-9XXX 9000–9999Reserved LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 BALTIMORE 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.