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 443
New assignments by month
Sep 2026
Aug 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-06-23 | 443-331-8XXX | 8000–8999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | TANEYTOWN | MD |
| 2015-05-27 | 443-663-0XXX | 0000–0999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WOODLAWN | MD |
| 2015-05-27 | 443-914-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WORTHINGTN | MD |
| 2015-05-20 | 443-526-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | HAVREGRACE | MD |
| 2015-05-20 | 443-639-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | HAMPSTEAD | MD |
| 2015-05-18 | 443-419-8XXX | 8000–8999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | GLENWOOD | MD |
| 2015-05-18 | 443-456-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | EDGEWOOD | MD |
| 2015-05-18 | 443-504-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | FALLSTON | MD |
| 2015-05-18 | 443-585-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | DARLINGTON | MD |
| 2015-05-18 | 443-776-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ELKRIDGE | MD |
| 2015-05-18 | 443-941-1XXX | 1000–1999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ELKTON | MD |
| 2015-05-12 | 443-457-4XXX | 4000–4999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | BRYNPKLNCM | MD |
| 2015-05-12 | 443-933-3XXX | 3000–3999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | COCKEYSVL | MD |
| 2015-05-04 | 443-775-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ANNAPOLIS | MD |
| 2006-04-17 | 443-747-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | PT DEPOSIT | MD |
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.