NumberResearchThousands-blocks in 703-436
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 703-436 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 703 blocks
Most active assignees, all time — NPA 703
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2005-06-27 | 703-436-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | LORTON | VA |
| 2004-11-22 | 703-436-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - VA | 8825 | LORTON | VA |
| 2005-08-18 | 703-436-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - VA | 8825 | LORTON | VA |
| 2006-05-10 | 703-436-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | LORTON | VA |
| — | 703-436-4XXX | 4000–4999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - VA | 8825 | LORTON | VA |
| 2009-03-17 | 703-436-5XXX | 5000–5999 | Assigned | CORETEL VIRGINIA, LLC - VA | 5832 | LORTON | VA |
| 2011-08-31 | 703-436-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - VA | 8825 | LORTON | VA |
| 2009-01-09 | 703-436-7XXX | 7000–7999 | Assigned | YMAX COMMUNICATIONS CORP. OF VIRGINIA - VA | 367E | LORTON | VA |
| 2008-03-03 | 703-436-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - VA | 8825 | LORTON | VA |
| 2007-05-14 | 703-436-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - VA | 8825 | LORTON | 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.