NumberResearchRecent thousands-block assignments
11 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, last 30 days — NPA 573
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-11-15 | 573-372-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | GRAVOIS ML | MO |
| 2013-11-14 | 573-466-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | ROLLA | MO |
| 2013-11-08 | 573-419-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CHAFFEE | MO |
| 2013-11-08 | 573-482-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | FARMINGTON | MO |
| 2013-11-08 | 573-725-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LOUISIANA | MO |
| 2013-11-08 | 573-901-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | MALDEN | MO |
| 2013-11-05 | 573-257-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | JEFFERSNCY | MO |
| 2013-11-04 | 573-207-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | GRAVOIS ML | MO |
| 2013-11-04 | 573-227-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | MARSTON | MO |
| 2013-11-04 | 573-262-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | ORAN | MO |
| 2013-11-04 | 573-314-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | FRANKFORD | MO |
| 2013-11-04 | 573-340-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WELLSVILLE | MO |
| 2013-11-04 | 573-342-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | RICHWOODS | MO |
| 2013-11-04 | 573-343-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | PUXICO | MO |
| 2013-11-04 | 573-349-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | PATTON | MO |
| 2013-11-04 | 573-352-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | POCAHONTAS | MO |
| 2013-11-04 | 573-362-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | FISK | MO |
| 2013-11-04 | 573-363-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | MACKSCREEK | MO |
| 2013-11-04 | 573-369-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | TUSCUMBIA | MO |
| 2013-11-04 | 573-370-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | GIDEON | MO |
| 2013-11-04 | 573-371-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HOLCOMB | MO |
| 2013-11-04 | 573-376-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HORNERSVL | MO |
| 2013-11-04 | 573-385-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | LILBOURN | MO |
| 2013-11-04 | 573-389-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | OAK RIDGE | MO |
| 2013-11-04 | 573-394-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | RISCO | MO |
| 2013-11-04 | 573-398-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | SCOTT CITY | MO |
| 2013-11-04 | 573-401-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ST MARYS | MO |
| 2013-11-04 | 573-402-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | WARDELL | MO |
| 2013-11-04 | 573-403-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WYATT | MO |
| 2013-11-04 | 573-404-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | QULIN | MO |
| 2013-11-04 | 573-412-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | PORTAGEVL | MO |
| 2013-11-04 | 573-440-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | FREDERCKTN | MO |
| 2013-11-04 | 573-454-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | FLAT RIVER | MO |
| 2013-11-04 | 573-479-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HAYTI | MO |
| 2013-11-04 | 573-521-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | NEW MADRID | MO |
| 2013-11-04 | 573-539-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | VERSAILLES | MO |
| 2013-11-04 | 573-544-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | FULTON | MO |
| 2013-11-04 | 573-562-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | LEADWOOD | MO |
| 2013-11-04 | 573-574-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | MONTGORYCY | MO |
| 2013-11-04 | 573-603-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | HANNIBAL | MO |
| 2013-11-04 | 573-608-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | STEGNVIEVE | MO |
| 2013-11-04 | 573-612-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | ROLLA | MO |
| 2013-11-04 | 573-621-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SIKESTON | MO |
| 2013-11-04 | 573-665-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | PAYNESVL | MO |
| 2013-11-04 | 573-667-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | MOREHOUSE | MO |
| 2013-11-04 | 573-712-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | POPLAR BLF | MO |
| 2013-11-04 | 573-723-9XXX | 9000–9999 | Assigned | SKYE TELECOM LLC DBA SKYETEL | 622J | LKOZKOSBCH | MO |
| 2013-11-04 | 573-738-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | SENATH | MO |
| 2013-11-04 | 573-741-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | MARBLEHILL | MO |
| 2013-11-04 | 573-755-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | JACKSON | 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.