NumberResearchThousands-blocks in 434-577
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 434-577 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 434 blocks
Most active assignees, all time — NPA 434
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-03-18 | 434-577-0XXX | 0000–0999 | Assigned | CORETEL VIRGINIA, LLC - VA | 5832 | SOBRUNSWIK | VA |
| 2015-12-30 | 434-577-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF VIRGINIA, LLC - VA | 275G | SOBRUNSWIK | VA |
| — | 434-577-2XXX | 2000–2999 | Reserved | VERIZON SOUTH, INC. - VA (CONTEL) | 0233 | SOBRUNSWIK | VA |
| 2021-04-20 | 434-577-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SOBRUNSWIK | VA |
| — | 434-577-4XXX | 4000–4999 | Available | SOBRUNSWIK | VA | ||
| — | 434-577-5XXX | 5000–5999 | Available | SOBRUNSWIK | VA | ||
| 2016-08-30 | 434-577-6XXX | 6000–6999 | Assigned | ONVOY, LLC - VA | 138E | SOBRUNSWIK | VA |
| 2014-05-28 | 434-577-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SOBRUNSWIK | VA |
| 2016-08-30 | 434-577-8XXX | 8000–8999 | Assigned | ONVOY, LLC - VA | 138E | SOBRUNSWIK | VA |
| — | 434-577-9XXX | 9000–9999 | Reserved | VERIZON SOUTH, INC. - VA (CONTEL) | 0233 | SOBRUNSWIK | VA |
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.