NumberResearchThousands-blocks in 410-775
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026
The ten 1,000-number thousand-blocks inside prefix 410-775 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 410 blocks
Most active assignees, all time — NPA 410
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 410-775-0XXX | 0000–0999 | Reserved | VERIZON MARYLAND, INC. | 9212 | UNION BDG | MD |
| — | 410-775-1XXX | 1000–1999 | Reserved | VERIZON MARYLAND, INC. | 9212 | UNION BDG | MD |
| — | 410-775-2XXX | 2000–2999 | Reserved | VERIZON MARYLAND, INC. | 9212 | UNION BDG | MD |
| 2006-04-12 | 410-775-3XXX | 3000–3999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | UNION BDG | MD |
| 2013-01-09 | 410-775-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | UNION BDG | MD |
| 2006-02-08 | 410-775-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | UNION BDG | MD |
| 2008-11-12 | 410-775-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | UNION BDG | MD |
| — | 410-775-7XXX | 7000–7999 | Reserved | VERIZON MARYLAND, INC. | 9212 | UNION BDG | MD |
| 2010-01-26 | 410-775-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | UNION BDG | MD |
| 2016-03-02 | 410-775-9XXX | 9000–9999 | Assigned | ONVOY, LLC - MD | 876D | UNION BDG | MD |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.