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 423
New assignments by month
Sep 2026
Aug 2026
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Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-03-18 | 423-613-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | NEWPORT | TN |
| 2025-03-18 | 423-919-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | NEWTAZWELL | TN |
| 2021-12-29 | 423-749-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | COLLEGEDL | TN |
| 2021-09-24 | 423-269-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2021-08-04 | 423-456-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | LAFOLLETTE | TN |
| 2021-04-13 | 423-376-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | MADISONVL | TN |
| 2021-04-13 | 423-419-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | CUMBERLDGP | TN |
| 2021-04-13 | 423-466-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | ATHENS | TN |
| 2021-04-13 | 423-577-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | ONEIDA | TN |
| 2021-04-13 | 423-621-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | MORRISTOWN | TN |
| 2021-04-13 | 423-734-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | ROGERSVL | TN |
| 2021-04-13 | 423-814-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | SWEETWATER | TN |
| 2021-01-05 | 423-732-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2020-05-21 | 423-662-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2020-03-09 | 423-732-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2019-06-28 | 423-251-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2018-12-26 | 423-482-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2018-04-03 | 423-251-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2018-02-16 | 423-482-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2017-11-20 | 423-251-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2017-07-21 | 423-682-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2017-07-13 | 423-354-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2017-03-01 | 423-354-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2017-02-28 | 423-251-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2017-02-08 | 423-497-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2017-01-05 | 423-251-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2016-12-01 | 423-876-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-12-01 | 423-876-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-11-02 | 423-682-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-09-07 | 423-888-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-04-07 | 423-354-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | BLOUNTVL | TN |
| 2016-04-07 | 423-530-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | KINGSPORT | TN |
| 2016-03-01 | 423-615-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | COLLEGEDL | TN |
| 2016-02-19 | 423-803-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2016-02-19 | 423-803-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2015-10-23 | 423-888-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2015-10-23 | 423-888-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2014-11-28 | 423-708-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2014-11-28 | 423-708-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2014-10-09 | 423-708-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2014-10-06 | 423-298-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2014-07-02 | 423-508-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2014-07-02 | 423-615-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | COLLEGEDL | TN |
| 2014-07-02 | 423-615-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | COLLEGEDL | TN |
| 2014-07-02 | 423-755-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2014-07-02 | 423-755-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2012-01-30 | 423-356-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2012-01-30 | 423-356-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2012-01-30 | 423-356-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
| 2012-01-30 | 423-356-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | CHATTNOOGA | TN |
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.