NumberResearchThousands-blocks in 443-485
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
The ten 1,000-number thousand-blocks inside prefix 443-485 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
Sep 2026
Aug 2026
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Jun 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-10-06 | 443-485-0XXX | 0000–0999 | Assigned | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | ELKTON | MD |
| 2011-01-31 | 443-485-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | ELKTON | MD |
| 2021-10-27 | 443-485-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | ELKTON | MD |
| 2021-10-27 | 443-485-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | ELKTON | MD |
| 2021-09-28 | 443-485-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | ELKTON | MD |
| 2008-05-06 | 443-485-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | ELKTON | MD |
| 2007-10-01 | 443-485-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | ELKTON | MD |
| 2011-01-31 | 443-485-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ELKTON | MD |
| 2011-01-31 | 443-485-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | ELKTON | MD |
| 2021-06-21 | 443-485-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ELKTON | 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.