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 667
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 |
|---|---|---|---|---|---|---|---|
| 2020-09-10 | 667-290-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BALTIMORE | MD |
| 2020-09-10 | 667-292-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SALISBURY | MD |
| 2019-03-27 | 667-204-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ANNAPOLIS | MD |
| 2019-03-27 | 667-256-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | ABERDEEN | MD |
| 2019-03-27 | 667-269-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ELKTON | MD |
| 2019-03-27 | 667-653-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | BRYNPKLNCM | MD |
| 2016-09-15 | 667-201-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | BEL AIR | MD |
| 2016-09-15 | 667-321-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | PRINCEFRCK | MD |
| 2016-09-15 | 667-458-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | ANNAPOLIS | MD |
| 2016-09-15 | 667-458-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | ANNAPOLIS | MD |
| 2016-09-15 | 667-666-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | WEST RIVER | MD |
| 2016-09-15 | 667-701-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | ELKRIDGE | MD |
| 2016-09-15 | 667-706-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ELKTON | MD |
| 2016-05-03 | 667-229-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ABERDEEN | MD |
| 2016-05-03 | 667-260-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BALTIMORE | MD |
| 2016-05-03 | 667-305-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | PIKESVILLE | MD |
| 2016-05-03 | 667-333-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | ARGRGBSNIS | MD |
| 2016-05-03 | 667-367-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | WESTMINSTR | MD |
| 2016-05-03 | 667-771-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | BALTIMORE | MD |
| 2015-12-07 | 667-206-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | TOWSON | MD |
| 2015-12-07 | 667-307-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | CROFTON | MD |
| 2015-12-07 | 667-701-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | ELKRIDGE | MD |
| 2015-10-21 | 667-444-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BALTIMORE | MD |
| 2014-11-03 | 667-309-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BALTIMORE | MD |
| 2013-08-12 | 667-308-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | TOWSON | MD |
| 2013-08-07 | 667-309-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BALTIMORE | 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.