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 301
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-05-27 | 301-200-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | INDIANHEAD | MD |
| 2015-05-27 | 301-307-7XXX | 7000–7999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WSNG238Z13 | MD |
| 2015-05-27 | 301-690-3XXX | 3000–3999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | LEONARDTN | MD |
| 2015-05-27 | 301-691-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | POOLESVL | MD |
| 2015-05-27 | 301-812-8XXX | 8000–8999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WSNG238Z15 | MD |
| 2015-05-12 | 301-242-2XXX | 2000–2999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | BRANDYWINE | MD |
| 2015-05-12 | 301-329-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ASHTON238 | MD |
| 2015-05-11 | 301-658-0XXX | 0000–0999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ASHTON236 | MD |
| 2015-05-06 | 301-246-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | NANJEMOY | MD |
| 2010-12-14 | 301-448-4XXX | 4000–4999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WSHNGTNZN3 | MD |
| 2006-04-12 | 301-886-3XXX | 3000–3999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WSNG236Z13 | MD |
| 2004-10-01 | 301-875-0XXX | 0000–0999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | LAUREL236 | MD |
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.