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 513
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-03-21 | 513-436-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | WILLIAMSBG | OH |
| 2012-12-19 | 513-901-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | WILLIAMSBG | OH |
| 2011-09-14 | 513-882-1XXX | 1000–1999 | Assigned | CITYNET OHIO, LLC - OH | 036B | CINCINNATI | OH |
| 2008-08-28 | 513-372-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | CINCINNATI | OH |
| 2008-07-24 | 513-445-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | MASON | OH |
| 2006-05-25 | 513-322-8XXX | 8000–8999 | Assigned | CITYNET OHIO, LLC - OH | 036B | CINCINNATI | OH |
| 2005-03-08 | 513-322-6XXX | 6000–6999 | Assigned | CITYNET OHIO, LLC - OH | 036B | CINCINNATI | OH |
| 2004-07-06 | 513-294-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | NEWTONSVL | OH |
| 2004-02-20 | 513-685-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | CLERMONT | OH |
| 2003-07-24 | 513-330-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | HAMILTON | OH |
| 2003-07-24 | 513-340-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | LTL MIAMI | OH |
| 2003-07-24 | 513-342-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | BETHANY | OH |
| 2003-06-25 | 513-322-7XXX | 7000–7999 | Assigned | CITYNET OHIO, LLC - OH | 036B | CINCINNATI | OH |
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.