NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 415
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-09-11 | 415-909-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNFC JUNPR | CA |
| 2015-05-13 | 415-650-3XXX | 3000–3999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNFC MT-EV | CA |
| 2014-07-09 | 415-872-9XXX | 9000–9999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNFC CNTRL | CA |
| 2014-04-04 | 415-769-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNFC JUNPR | CA |
| 2013-07-17 | 415-757-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNFC CNTRL | CA |
| 2011-07-28 | 415-237-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | INVERNESS | CA |
| 2011-05-04 | 415-862-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | STNSN-BLNS | CA |
| 2011-05-04 | 415-873-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | POINTREYES | CA |
| 2011-05-04 | 415-900-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | BELVEDERE | CA |
| 2008-07-30 | 415-612-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | IGNACIO | CA |
| 2006-10-19 | 415-758-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | CORTEMADRA | CA |
| 2006-05-15 | 415-702-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNFC MT-EV | CA |
| 2006-04-11 | 415-324-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SAUSALITO | CA |
| 2006-04-11 | 415-326-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | MILLVALLEY | CA |
| 2006-01-26 | 415-347-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNFC JUNPR | CA |
| 2005-03-25 | 415-295-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SAN RAFAEL | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.