NumberResearchThousands-blocks in 620-508
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 620-508 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 |
|---|---|---|---|---|---|---|---|
| — | 620-508-0XXX | 0000–0999 | Reserved | SOUTHWESTERN BELL | 9533 | PRATT | KS |
| 2006-08-08 | 620-508-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PRATT | KS |
| 2014-02-25 | 620-508-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - KS | 986E | PRATT | KS |
| 2017-04-20 | 620-508-3XXX | 3000–3999 | Assigned | ONVOY, LLC - KS | 205F | PRATT | KS |
| 2020-09-17 | 620-508-4XXX | 4000–4999 | Assigned | ONVOY, LLC - KS | 205F | PRATT | KS |
| 2012-12-12 | 620-508-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PRATT | KS |
| 2007-01-31 | 620-508-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | PRATT | KS |
| 2013-01-22 | 620-508-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - KS | 8995 | PRATT | KS |
| 2019-04-05 | 620-508-8XXX | 8000–8999 | Assigned | ONVOY, LLC - KS | 205F | PRATT | KS |
| 2019-04-05 | 620-508-9XXX | 9000–9999 | Assigned | ONVOY, LLC - KS | 205F | PRATT | 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.