NumberResearchThousands-blocks in 573-629
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 573-629 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 573 blocks
Most active assignees, all time — NPA 573
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 573-629-0XXX | 0000–0999 | Reserved | SOUTHWESTERN BELL | 9533 | HANNIBAL | MO |
| 2006-08-28 | 573-629-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | HANNIBAL | MO |
| 2007-09-18 | 573-629-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HANNIBAL | MO |
| 2007-12-03 | 573-629-3XXX | 3000–3999 | Assigned | SOUTHWESTERN BELL | 9533 | HANNIBAL | MO |
| 2008-07-21 | 573-629-4XXX | 4000–4999 | Assigned | SOUTHWESTERN BELL | 9533 | HANNIBAL | MO |
| 2009-09-15 | 573-629-5XXX | 5000–5999 | Assigned | UNITED STATES CELLULAR - MO | 6275 | HANNIBAL | MO |
| 2009-05-05 | 573-629-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MO | 7218 | HANNIBAL | MO |
| 2008-10-24 | 573-629-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HANNIBAL | MO |
| 2007-07-23 | 573-629-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HANNIBAL | MO |
| 2008-07-15 | 573-629-9XXX | 9000–9999 | Assigned | UNITED STATES CELLULAR - MO | 6275 | HANNIBAL | MO |
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.