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 636
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-09-06 | 636-287-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MAXVILLE | MO |
| 2015-02-20 | 636-362-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HARVESTER | MO |
| 2014-04-02 | 636-206-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ST CHARLES | MO |
| 2013-08-26 | 636-686-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MANCHESTER | MO |
| 2011-09-30 | 636-479-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HERCUMPVLY | MO |
| 2011-04-28 | 636-285-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CEDAR HILL | MO |
| 2011-04-28 | 636-334-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PACIFIC | MO |
| 2011-04-28 | 636-434-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PORTAGSIUX | MO |
| 2011-04-21 | 636-243-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DE SOTO | MO |
| 2011-04-21 | 636-364-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ST CLAIR | MO |
| 2011-04-21 | 636-402-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | GRAYSUMMIT | MO |
| 2011-04-21 | 636-582-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | UNION | MO |
| 2011-04-21 | 636-944-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WARE | MO |
| 2010-09-13 | 636-486-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HARVESTER | MO |
| 2010-07-16 | 636-481-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HILLSBORO | MO |
| 2010-02-23 | 636-253-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HIGH RIDGE | MO |
| 2010-02-23 | 636-525-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | IMPERIAL | MO |
| 2010-02-23 | 636-543-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FSSCRSTLCY | MO |
| 2009-10-06 | 636-283-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | WASHINGTON | MO |
| 2008-09-19 | 636-587-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | EUREKA | MO |
| 2006-10-17 | 636-323-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ANTONIA | MO |
| 2006-06-20 | 636-284-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | HARVESTER | MO |
| 2006-03-13 | 636-386-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MANCHESTER | MO |
| 2006-03-13 | 636-517-1XXX | 1000–1999 | Assigned | AT&T ENTERPRISES, LLC | 516C | VALLEYPARK | MO |
| 2006-03-13 | 636-678-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FENTON | MO |
| 2006-03-13 | 636-812-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CHESTERFLD | MO |
| 2006-02-03 | 636-422-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | POND | MO |
| 2006-02-03 | 636-548-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MAXVILLE | MO |
| 2006-01-19 | 636-395-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | ST CHARLES | 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.