NumberResearchThousands-blocks in 410-343
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 410-343 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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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 410-343-0XXX | 0000–0999 | Reserved | VERIZON MARYLAND, INC. | 9212 | SPARKSGLNC | MD |
| — | 410-343-1XXX | 1000–1999 | Reserved | VERIZON MARYLAND, INC. | 9212 | SPARKSGLNC | MD |
| — | 410-343-2XXX | 2000–2999 | Reserved | VERIZON MARYLAND, INC. | 9212 | SPARKSGLNC | MD |
| — | 410-343-3XXX | 3000–3999 | Reserved | VERIZON MARYLAND, INC. | 9212 | SPARKSGLNC | MD |
| 2016-03-16 | 410-343-4XXX | 4000–4999 | Assigned | ONVOY, LLC - MD | 876D | SPARKSGLNC | MD |
| 2004-03-04 | 410-343-5XXX | 5000–5999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | SPARKSGLNC | MD |
| 2019-04-12 | 410-343-6XXX | 6000–6999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | SPARKSGLNC | MD |
| 2006-02-08 | 410-343-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | SPARKSGLNC | MD |
| 2006-01-19 | 410-343-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | SPARKSGLNC | MD |
| 2008-11-12 | 410-343-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MD | 071F | SPARKSGLNC | 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.