NumberResearch Membership · Data 09/19/2026

Thousands-blocks in 443-748

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 443-748 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
PAETEC ITEL, LLC 2
ONVOY, LLC - MD 2
CORE COMMUNICATIONS, INC.- MD 2
ONVOY SPECTRUM, 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
— 443-748-0XXX 0000–0999Reserved PAETEC ITEL, LLC 829J MILLERSVL MD
2021-03-03 443-748-1XXX 1000–1999Assigned ONVOY, LLC - MD 876D MILLERSVL MD
2013-04-04 443-748-2XXX 2000–2999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G MILLERSVL MD
— 443-748-3XXX 3000–3999Reserved PAETEC ITEL, LLC 829J MILLERSVL MD
2013-04-04 443-748-4XXX 4000–4999Assigned PEERLESS NETWORK OF MARYLAND, LLC 568G MILLERSVL MD
2022-01-07 443-748-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H MILLERSVL MD
2018-05-23 443-748-6XXX 6000–6999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MILLERSVL MD
2018-05-23 443-748-7XXX 7000–7999Assigned CORE COMMUNICATIONS, INC.- MD 2593 MILLERSVL MD
— 443-748-8XXX 8000–8999Available MILLERSVL MD
2022-10-24 443-748-9XXX 9000–9999Assigned ONVOY, LLC - MD 876D MILLERSVL 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.