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 731
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 |
|---|---|---|---|---|---|---|---|
| 2016-08-11 | 731-332-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MARTIN | TN |
| 2014-05-01 | 731-632-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ADAMSVILLE | TN |
| 2014-04-07 | 731-400-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SAVANNAH | TN |
| 2014-04-07 | 731-470-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TRENTON | TN |
| 2014-04-07 | 731-592-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | UNION CITY | TN |
| 2014-04-07 | 731-624-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TROY | TN |
| 2014-04-04 | 731-201-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BIG SANDY | TN |
| 2014-04-04 | 731-203-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BOLIVAR | TN |
| 2014-04-04 | 731-214-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CEDARGROVE | TN |
| 2014-04-04 | 731-227-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | PARIS | TN |
| 2014-04-04 | 731-238-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MILAN | TN |
| 2014-04-04 | 731-259-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DYERSBURG | TN |
| 2014-04-04 | 731-393-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MCKENZIE | TN |
| 2014-04-04 | 731-419-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | RIPLEY | TN |
| 2014-04-04 | 731-435-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HENDERSON | TN |
| 2014-04-04 | 731-451-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HENNING | TN |
| 2014-04-04 | 731-462-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MEDINA | TN |
| 2014-04-04 | 731-468-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CAMDEN | TN |
| 2014-04-04 | 731-474-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GIBSON | TN |
| 2014-04-04 | 731-483-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DYER | TN |
| 2014-04-04 | 731-501-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BELLS | TN |
| 2014-04-04 | 731-503-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | NEWBERN | TN |
| 2014-04-04 | 731-519-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BROWNSVL | TN |
| 2014-04-04 | 731-577-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BETHEL SPG | TN |
| 2014-04-04 | 731-618-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HUMBOLDT | TN |
| 2014-04-04 | 731-681-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GLEASON | TN |
| 2014-04-04 | 731-732-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GRAND JCT | TN |
| 2014-04-04 | 731-792-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HUNTINGDON | TN |
| 2014-04-04 | 731-798-4XXX | 4000–4999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LEXINGTON | TN |
| 2014-04-04 | 731-837-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MIDDLETON | TN |
| 2014-04-04 | 731-859-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WHITEVILLE | TN |
| 2014-04-04 | 731-903-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HALLS | TN |
| 2014-04-04 | 731-907-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HORNBEAK | TN |
| 2014-04-04 | 731-937-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | KENTON | TN |
| 2014-03-27 | 731-736-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | JACKSON | TN |
| 2014-03-12 | 731-327-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MICHIE | TN |
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.