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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-10-02 | 423-792-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | OAKDALE | TN |
| 2024-05-15 | 423-936-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | SUNBRIGHT | TN |
| 2024-05-15 | 423-941-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | DEER LODGE | TN |
| 2024-05-14 | 423-363-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | HUNTSVILLE | TN |
| 2024-05-14 | 423-701-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | ROBBINS | TN |
| 2023-08-07 | 423-577-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | ONEIDA | TN |
| 2023-08-07 | 423-866-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | NIOTA | TN |
| 2023-07-31 | 423-632-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | WARTBURG | TN |
| 2022-09-28 | 423-532-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | NEWPORT | TN |
| 2022-09-27 | 423-769-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | BENTON | TN |
| 2020-12-08 | 423-812-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | GREENEVL | TN |
| 2020-12-08 | 423-850-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | JONESBORO | TN |
| 2016-01-29 | 423-803-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2016-01-25 | 423-377-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | LAFOLLETTE | TN |
| 2015-10-30 | 423-609-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | GREENEVL | TN |
| 2015-09-02 | 423-806-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | MIDWAY | TN |
| 2015-07-28 | 423-781-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | ETOWAH | TN |
| 2015-07-14 | 423-491-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | JOHNSON CY | TN |
| 2015-06-05 | 423-713-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2015-03-02 | 423-910-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | OOLTEWAH | TN |
| 2015-02-20 | 423-607-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | LIMESTONE | TN |
| 2015-02-20 | 423-788-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | JONESBORO | TN |
| 2014-08-05 | 423-270-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | ERWIN | TN |
| 2014-06-25 | 423-405-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | ATHENS | TN |
| 2014-04-08 | 423-551-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2013-12-19 | 423-823-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | GREENEVL | TN |
| 2013-11-07 | 423-805-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2013-09-20 | 423-449-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | LAFOLLETTE | TN |
| 2013-07-31 | 423-385-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2013-04-19 | 423-328-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | JOHNSON CY | TN |
| 2012-11-26 | 423-668-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2012-05-31 | 423-207-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | MIDWAY | TN |
| 2012-03-27 | 423-485-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2012-03-27 | 423-588-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | GREENEVL | TN |
| 2012-02-09 | 423-401-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | SODDYDAISY | TN |
| 2012-01-23 | 423-321-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2011-08-19 | 423-710-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2011-08-08 | 423-437-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | LAFOLLETTE | TN |
| 2011-08-08 | 423-913-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | JONESBORO | TN |
| 2011-07-22 | 423-264-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | VONORE | TN |
| 2011-02-25 | 423-531-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2011-02-25 | 423-531-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2011-01-21 | 423-252-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | ATHENS | TN |
| 2010-06-15 | 423-328-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | JOHNSON CY | TN |
| 2010-03-26 | 423-201-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | LAFOLLETTE | TN |
| 2009-05-27 | 423-525-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | GREENEVL | TN |
| 2009-04-20 | 423-710-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2009-04-20 | 423-710-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2009-03-06 | 423-508-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | CHATTNOOGA | TN |
| 2008-10-22 | 423-393-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | BULLS GAP | 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.