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 410
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-06-23 | 410-324-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | TOWSON | MD |
| 2015-05-27 | 410-741-7XXX | 7000–7999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | WEST RIVER | MD |
| 2015-05-20 | 410-692-1XXX | 1000–1999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | JARRETTSVL | MD |
| 2015-05-18 | 410-238-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ESSEX | MD |
| 2015-05-18 | 410-650-1XXX | 1000–1999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | DUNDALK | MD |
| 2015-05-12 | 410-344-4XXX | 4000–4999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | CHASE | MD |
| 2015-05-12 | 410-399-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | BEL AIR | MD |
| 2015-05-12 | 410-452-2XXX | 2000–2999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | CARDIFF | MD |
| 2015-05-12 | 410-914-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | CHURCHVL | MD |
| 2015-05-04 | 410-587-7XXX | 7000–7999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ARBUTUS | MD |
| 2010-10-21 | 410-999-2XXX | 2000–2999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | GLENBURNIE | MD |
| 2010-10-21 | 410-999-3XXX | 3000–3999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | GLENBURNIE | MD |
| 2006-04-17 | 410-557-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | FORK | MD |
| 2006-04-17 | 410-781-2XXX | 2000–2999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | ELLICOTTCY | MD |
| 2006-04-17 | 410-794-5XXX | 5000–5999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | COLUMBIA | MD |
| 2006-04-17 | 410-807-4XXX | 4000–4999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | CATONSVL | MD |
| 2006-04-12 | 410-775-3XXX | 3000–3999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | UNION BDG | MD |
| 2003-06-16 | 410-999-6XXX | 6000–6999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | GLENBURNIE | MD |
| 2003-06-16 | 410-999-9XXX | 9000–9999 | Assigned | BALTIMORE-WASHINGTON TELEPHONE (BWT) | 8697 | GLENBURNIE | 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.