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 513
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 |
|---|---|---|---|---|---|---|---|
| 2019-07-08 | 513-572-0XXX | 0000–0999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | CINCINNATI | OH |
| 2012-11-02 | 513-280-9XXX | 9000–9999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | OXFORD | OH |
| 2012-09-12 | 513-201-6XXX | 6000–6999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | CLERMONT | OH |
| 2012-09-12 | 513-279-7XXX | 7000–7999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | HARRISON | OH |
| 2012-09-12 | 513-296-3XXX | 3000–3999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | REILY | OH |
| 2012-09-12 | 513-323-8XXX | 8000–8999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | SHANDON | OH |
| 2012-09-12 | 513-392-7XXX | 7000–7999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | MIDDLETOWN | OH |
| 2012-09-12 | 513-402-9XXX | 9000–9999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | MONROE | OH |
| 2012-09-12 | 513-427-1XXX | 1000–1999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | BETHEL | OH |
| 2012-09-12 | 513-428-3XXX | 3000–3999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | TRENTON | OH |
| 2012-09-12 | 513-437-5XXX | 5000–5999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | SEVEN MILE | OH |
| 2012-09-12 | 513-443-7XXX | 7000–7999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | BETHANY | OH |
| 2012-09-12 | 513-456-8XXX | 8000–8999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | NEWTONSVL | OH |
| 2012-09-12 | 513-492-0XXX | 0000–0999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | MASON | OH |
| 2012-09-12 | 513-536-1XXX | 1000–1999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | WILLIAMSBG | OH |
| 2012-09-12 | 513-716-3XXX | 3000–3999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | LTL MIAMI | OH |
| 2012-09-12 | 513-858-0XXX | 0000–0999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | HAMILTON | OH |
| 2009-10-07 | 513-835-0XXX | 0000–0999 | Assigned | CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS | 600F | CINCINNATI | OH |
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.