NumberResearchThousands-blocks in 620-604
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 620-604 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 620 blocks
Most active assignees, all time — NPA 620
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 620-604-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - KS | 2240 | LIBERAL | KS |
| 2004-08-26 | 620-604-1XXX | 1000–1999 | Assigned | SOUTHWESTERN BELL | 9533 | LIBERAL | KS |
| 2004-08-26 | 620-604-2XXX | 2000–2999 | Assigned | SOUTHWESTERN BELL | 9533 | LIBERAL | KS |
| 2019-05-10 | 620-604-3XXX | 3000–3999 | Assigned | ONVOY, LLC - KS | 205F | LIBERAL | KS |
| 2004-12-16 | 620-604-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - KS | 2240 | LIBERAL | KS |
| 2012-12-11 | 620-604-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LIBERAL | KS |
| 2018-12-17 | 620-604-6XXX | 6000–6999 | Assigned | ONVOY, LLC - KS | 205F | LIBERAL | KS |
| 2014-02-11 | 620-604-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LIBERAL | KS |
| 2018-12-17 | 620-604-8XXX | 8000–8999 | Assigned | ONVOY, LLC - KS | 205F | LIBERAL | KS |
| — | 620-604-9XXX | 9000–9999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - KS | 2240 | LIBERAL | KS |
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.