NumberResearchThousands-blocks in 540-788
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 540-788 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2009-03-17 | 540-788-0XXX | 0000–0999 | Assigned | CORETEL VIRGINIA, LLC - VA | 5832 | CALVERTON | VA |
| — | 540-788-1XXX | 1000–1999 | Reserved | VERIZON VIRGINIA, INC. | 9213 | CALVERTON | VA |
| 2012-08-01 | 540-788-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - VA | 079F | CALVERTON | VA |
| — | 540-788-3XXX | 3000–3999 | Reserved | VERIZON VIRGINIA, INC. | 9213 | CALVERTON | VA |
| — | 540-788-4XXX | 4000–4999 | Reserved | VERIZON VIRGINIA, INC. | 9213 | CALVERTON | VA |
| 2008-12-12 | 540-788-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CALVERTON | VA |
| 2008-02-05 | 540-788-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | CALVERTON | VA |
| 2014-06-16 | 540-788-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CALVERTON | VA |
| 2009-12-22 | 540-788-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | CALVERTON | VA |
| — | 540-788-9XXX | 9000–9999 | Reserved | VERIZON VIRGINIA, INC. | 9213 | CALVERTON | 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.