NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 240
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 |
|---|---|---|---|---|---|---|---|
| 2020-09-17 | 240-739-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | FREDERICK | MD |
| 2019-03-28 | 240-531-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN3 | MD |
| 2019-03-28 | 240-867-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN3 | MD |
| 2017-06-13 | 240-621-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN11 | MD |
| 2017-06-13 | 240-665-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN10 | MD |
| 2017-06-13 | 240-918-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | ASHTON236 | MD |
| 2016-09-15 | 240-845-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | WSNG236Z13 | MD |
| 2016-09-15 | 240-845-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | WSNG236Z13 | MD |
| 2016-05-03 | 240-771-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | POOLESVL | MD |
| 2016-05-03 | 240-810-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN10 | MD |
| 2016-05-03 | 240-810-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN10 | MD |
| 2016-05-03 | 240-830-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN5 | MD |
| 2016-05-03 | 240-830-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN5 | MD |
| 2016-05-03 | 240-847-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN3 | MD |
| 2016-05-02 | 240-261-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | GAITHERSBG | MD |
| 2016-05-02 | 240-444-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | LAUREL236 | MD |
| 2016-05-02 | 240-448-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WALDORF | MD |
| 2016-05-02 | 240-534-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN2 | MD |
| 2016-05-02 | 240-546-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN16 | MD |
| 2016-05-02 | 240-573-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSNG236Z15 | MD |
| 2016-05-02 | 240-623-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN4 | MD |
| 2016-05-02 | 240-633-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HUGHESVL | MD |
| 2016-05-02 | 240-817-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | ASHTON236 | MD |
| 2016-05-02 | 240-846-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN16 | MD |
| 2016-05-02 | 240-970-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN12 | MD |
| 2015-02-19 | 240-348-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN16 | MD |
| 2015-02-19 | 240-503-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | TOMPKINSVL | MD |
| 2015-02-19 | 240-745-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | DAMASCS236 | MD |
| 2015-02-19 | 240-787-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BRANDYWINE | MD |
| 2015-02-19 | 240-892-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WSNG236Z15 | MD |
| 2013-08-12 | 240-245-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSNG236Z14 | MD |
| 2013-08-12 | 240-467-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN4 | MD |
| 2013-08-12 | 240-470-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | LAUREL236 | MD |
| 2013-08-12 | 240-560-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN12 | MD |
| 2013-08-12 | 240-616-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WSNG236Z13 | MD |
| 2013-08-12 | 240-669-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN11 | MD |
| 2013-08-12 | 240-670-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN3 | MD |
| 2013-08-12 | 240-672-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSNGTNZN10 | MD |
| 2013-08-12 | 240-780-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | GAITHERSBG | MD |
| 2013-08-12 | 240-800-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WSHNGTNZN2 | MD |
| 2013-08-07 | 240-530-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | WALDORF | MD |
| 2010-07-21 | 240-542-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | WSNG236Z13 | MD |
| 2007-08-17 | 240-720-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | GAITHERSBG | MD |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.