NumberResearchRecent thousands-block assignments
1 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, last 30 days — NPA 301
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 |
|---|---|---|---|---|---|---|---|
| 2003-05-08 | 301-833-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | WSNG236Z14 | MD |
| 2003-05-08 | 301-833-9XXX | 9000–9999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | WSNG236Z14 | MD |
| 2003-05-07 | 301-337-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | GAITHERSBG | MD |
| 2003-04-02 | 301-407-4XXX | 4000–4999 | Assigned | VERIZON MARYLAND, INC. | 9212 | GAITHERSBG | MD |
| 2003-03-12 | 301-531-9XXX | 9000–9999 | Assigned | PAETEC ITEL, LLC | 829J | WSHNGTNZN4 | MD |
| 2003-03-12 | 301-886-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | WSNG236Z13 | MD |
| 2003-02-28 | 301-358-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | WSNG236Z15 | MD |
| 2003-02-28 | 301-476-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | ASHTON236 | MD |
| 2003-02-28 | 301-579-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | BRANDYWINE | MD |
| 2003-02-28 | 301-685-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | DAMASCS236 | MD |
| 2003-02-14 | 301-232-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | ASHTON236 | MD |
| 2003-02-10 | 301-876-0XXX | 0000–0999 | Assigned | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | 4720 | CUMBERLAND | MD |
| 2003-02-10 | 301-876-1XXX | 1000–1999 | Assigned | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | 4720 | CUMBERLAND | MD |
| 2003-02-10 | 301-876-2XXX | 2000–2999 | Assigned | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | 4720 | CUMBERLAND | MD |
| 2003-02-10 | 301-876-3XXX | 3000–3999 | Assigned | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | 4720 | CUMBERLAND | MD |
| 2003-02-06 | 301-242-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | BRANDYWINE | MD |
| 2002-11-22 | 301-418-9XXX | 9000–9999 | Assigned | VERIZON MARYLAND, INC. | 9212 | FREDERICK | MD |
| 2002-11-06 | 301-265-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | 7529 | WSHNGTNZN6 | MD |
| 2002-08-30 | 301-789-0XXX | 0000–0999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | WSHNGTNZN4 | MD |
| 2002-07-18 | 301-857-0XXX | 0000–0999 | Assigned | CORE COMMUNICATIONS, INC.- MD | 2593 | CLEAR SPG | MD |
| 2002-05-23 | 301-850-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | WSNG236Z14 | MD |
| 2002-05-17 | 301-876-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | CUMBERLAND | MD |
| 2002-01-17 | 301-859-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | OAKLAND | MD |
| 2001-11-21 | 301-238-0XXX | 0000–0999 | Assigned | VERIZON MARYLAND, INC. | 9212 | WSNGTNZN16 | MD |
| 2001-10-03 | 301-829-7XXX | 7000–7999 | Assigned | VERIZON MARYLAND, INC. | 9212 | MOUNT AIRY | 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.