NumberResearchThousands-blocks in 443-747
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
The ten 1,000-number thousand-blocks inside prefix 443-747 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
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2004-03-04 | 443-747-0XXX | 0000–0999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | PT DEPOSIT | MD |
| 2011-05-20 | 443-747-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | PT DEPOSIT | MD |
| 2004-01-15 | 443-747-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | PT DEPOSIT | MD |
| — | 443-747-3XXX | 3000–3999 | Reserved | CORE COMMUNICATIONS, INC.- MD | 2593 | PT DEPOSIT | MD |
| 2011-12-08 | 443-747-4XXX | 4000–4999 | Assigned | IDT AMERICA, CORP. - MD | 228C | PT DEPOSIT | MD |
| 2006-04-17 | 443-747-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | PT DEPOSIT | MD |
| 2016-04-20 | 443-747-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | PT DEPOSIT | MD |
| 2012-09-12 | 443-747-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MD | 876D | PT DEPOSIT | MD |
| 2013-04-04 | 443-747-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF MARYLAND, LLC | 568G | PT DEPOSIT | MD |
| 2013-04-04 | 443-747-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF MARYLAND, LLC | 568G | PT DEPOSIT | 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.