NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/26/2026
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 423
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 |
|---|---|---|---|---|---|---|---|
| 2011-10-26 | 423-882-0XXX | 0000–0999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-1XXX | 1000–1999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-2XXX | 2000–2999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-3XXX | 3000–3999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-4XXX | 4000–4999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-5XXX | 5000–5999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-6XXX | 6000–6999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-7XXX | 7000–7999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-8XXX | 8000–8999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-10-26 | 423-882-9XXX | 9000–9999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2011-04-09 | 423-492-5XXX | 5000–5999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | MORRISTOWN | TN |
| 2011-04-09 | 423-492-6XXX | 6000–6999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | MORRISTOWN | TN |
| 2011-04-09 | 423-492-7XXX | 7000–7999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | MORRISTOWN | TN |
| 2011-04-09 | 423-492-8XXX | 8000–8999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | MORRISTOWN | TN |
| 2011-04-09 | 423-492-9XXX | 9000–9999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | MORRISTOWN | TN |
| 2009-08-10 | 423-582-3XXX | 3000–3999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2009-08-10 | 423-582-4XXX | 4000–4999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2009-08-10 | 423-582-5XXX | 5000–5999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2006-09-08 | 423-463-3XXX | 3000–3999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2005-05-05 | 423-535-7XXX | 7000–7999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2005-04-29 | 423-535-8XXX | 8000–8999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2005-01-27 | 423-535-1XXX | 1000–1999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2005-01-27 | 423-535-2XXX | 2000–2999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2005-01-27 | 423-535-3XXX | 3000–3999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2005-01-27 | 423-535-4XXX | 4000–4999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2005-01-27 | 423-535-5XXX | 5000–5999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| 2005-01-27 | 423-535-6XXX | 6000–6999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.