NumberResearchThousands-blocks in 540-644
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 540-644 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 540 blocks
Most active assignees, all time — NPA 540
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 540-644-0XXX | 0000–0999 | Reserved | VERIZON SOUTH, INC. - VA (CONTEL) | 0233 | DAHLGREN | VA |
| — | 540-644-1XXX | 1000–1999 | Reserved | VERIZON SOUTH, INC. - VA (CONTEL) | 0233 | DAHLGREN | VA |
| — | 540-644-2XXX | 2000–2999 | Reserved | VERIZON SOUTH, INC. - VA (CONTEL) | 0233 | DAHLGREN | VA |
| 2019-03-05 | 540-644-3XXX | 3000–3999 | Assigned | CORETEL VIRGINIA, LLC - VA | 5832 | DAHLGREN | VA |
| 2018-05-21 | 540-644-4XXX | 4000–4999 | Assigned | CORETEL VIRGINIA, LLC - VA | 5832 | DAHLGREN | VA |
| 2018-11-12 | 540-644-5XXX | 5000–5999 | Assigned | PEERLESS NETWORK OF VIRGINIA, LLC - VA | 275G | DAHLGREN | VA |
| — | 540-644-6XXX | 6000–6999 | Reserved | VERIZON SOUTH, INC. - VA (CONTEL) | 0233 | DAHLGREN | VA |
| 2018-11-20 | 540-644-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - VA | 4644 | DAHLGREN | VA |
| — | 540-644-8XXX | 8000–8999 | Reserved | VERIZON SOUTH, INC. - VA (CONTEL) | 0233 | DAHLGREN | VA |
| — | 540-644-9XXX | 9000–9999 | Reserved | VERIZON SOUTH, INC. - VA (CONTEL) | 0233 | DAHLGREN | 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.