NumberResearchThousands-blocks in 503-996
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 503-996 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 503 blocks
Most active assignees, all time — NPA 503
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 503-996-0XXX | 0000–0999 | Available | MOUNTANGEL | OR | ||
| 2009-06-22 | 503-996-1XXX | 1000–1999 | Assigned | ASTOUND BROADBAND, LLC - OR | 936F | MOUNTANGEL | OR |
| 2023-06-28 | 503-996-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | MOUNTANGEL | OR |
| — | 503-996-3XXX | 3000–3999 | Available | MOUNTANGEL | OR | ||
| — | 503-996-4XXX | 4000–4999 | Available | MOUNTANGEL | OR | ||
| 2023-12-14 | 503-996-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - OR | 3234 | MOUNTANGEL | OR |
| 2025-06-18 | 503-996-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MOUNTANGEL | OR |
| — | 503-996-7XXX | 7000–7999 | Available | MOUNTANGEL | OR | ||
| — | 503-996-8XXX | 8000–8999 | Available | MOUNTANGEL | OR | ||
| 2023-08-29 | 503-996-9XXX | 9000–9999 | Assigned | ALYRICA TELEPHONE LLC DBA NEXT GEN PHONE SYS-OR | 9882 | MOUNTANGEL | OR |
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.