NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 573
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-09-12 | 573-496-5XXX | 5000–5999 | Assigned | MCC TELEPHONY LLC | 593K | BRAZITO | MO |
| 2022-09-02 | 573-907-5XXX | 5000–5999 | Assigned | MCC TELEPHONY LLC | 593K | ST THOMAS | MO |
| 2022-08-30 | 573-488-8XXX | 8000–8999 | Assigned | MCC TELEPHONY LLC | 593K | ASHLAND | MO |
| 2022-08-30 | 573-520-8XXX | 8000–8999 | Assigned | MCC TELEPHONY LLC | 593K | RUSSELLVL | MO |
| 2022-08-30 | 573-533-7XXX | 7000–7999 | Assigned | MCC TELEPHONY LLC | 593K | CENTERTOWN | MO |
| 2022-08-30 | 573-536-5XXX | 5000–5999 | Assigned | MCC TELEPHONY LLC | 593K | TAOS | MO |
| 2022-08-30 | 573-595-2XXX | 2000–2999 | Assigned | MCC TELEPHONY LLC | 593K | EUGENE | MO |
| 2022-08-30 | 573-909-3XXX | 3000–3999 | Assigned | MCC TELEPHONY LLC | 593K | NEWBLOMFLD | MO |
| 2019-11-14 | 573-843-5XXX | 5000–5999 | Assigned | MCC TELEPHONY LLC | 593K | CARUTHRSVL | MO |
| 2019-11-14 | 573-930-5XXX | 5000–5999 | Assigned | MCC TELEPHONY LLC | 593K | HAYTI | MO |
| 2019-09-10 | 573-507-6XXX | 6000–6999 | Assigned | MCC TELEPHONY LLC | 593K | COLUMBIA | MO |
| 2018-04-20 | 573-818-1XXX | 1000–1999 | Assigned | MCC TELEPHONY LLC | 593K | COLUMBIA | MO |
| 2018-03-19 | 573-616-4XXX | 4000–4999 | Assigned | MCC TELEPHONY LLC | 593K | JEFFERSNCY | MO |
| 2017-08-11 | 573-607-9XXX | 9000–9999 | Assigned | MCC TELEPHONY LLC | 593K | COLUMBIA | MO |
| 2016-09-01 | 573-476-6XXX | 6000–6999 | Assigned | MCC TELEPHONY LLC | 593K | COLUMBIA | MO |
| 2016-07-25 | 573-616-3XXX | 3000–3999 | Assigned | MCC TELEPHONY LLC | 593K | JEFFERSNCY | MO |
| 2012-11-12 | 573-514-7XXX | 7000–7999 | Assigned | MCC TELEPHONY LLC | 593K | COLUMBIA | MO |
| 2012-03-27 | 573-397-6XXX | 6000–6999 | Assigned | MCC TELEPHONY LLC | 593K | COLUMBIA | MO |
| 2011-11-14 | 573-616-2XXX | 2000–2999 | Assigned | MCC TELEPHONY LLC | 593K | JEFFERSNCY | MO |
| 2011-06-21 | 573-228-6XXX | 6000–6999 | Assigned | MCC TELEPHONY LLC | 593K | COLUMBIA | MO |
| 2010-04-30 | 573-228-9XXX | 9000–9999 | Assigned | MCC TELEPHONY LLC | 593K | COLUMBIA | MO |
| 2010-04-14 | 573-486-6XXX | 6000–6999 | Assigned | MCC TELEPHONY LLC | 593K | HERMANN | MO |
| 2010-04-14 | 573-616-1XXX | 1000–1999 | Assigned | MCC TELEPHONY LLC | 593K | JEFFERSNCY | 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.