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
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-05-01 | 731-500-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | PARSONS | TN |
| 2023-02-08 | 731-281-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | MARTIN | TN |
| 2023-02-01 | 731-510-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | ADAMSVILLE | TN |
| 2022-02-23 | 731-656-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | MAURY CITY | TN |
| 2021-08-16 | 731-341-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | DRESDEN | TN |
| 2021-07-22 | 731-677-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | FRIENDSHIP | TN |
| 2020-04-20 | 731-461-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | ALAMO | TN |
| 2020-04-01 | 731-205-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | RUTHERFORD | TN |
| 2019-06-06 | 731-223-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SO FULTON | TN |
| 2017-11-30 | 731-274-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SIDONIA | TN |
| 2017-11-30 | 731-275-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | PALMERSVL | TN |
| 2017-11-30 | 731-276-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | LATHAM | TN |
| 2017-06-13 | 731-462-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | MEDINA | TN |
| 2017-02-09 | 731-330-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | TRENTON | TN |
| 2015-11-03 | 731-437-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | TN |
| 2014-06-27 | 731-868-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | TN |
| 2014-05-01 | 731-617-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BELLS | TN |
| 2014-05-01 | 731-689-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SHILOH | TN |
| 2014-04-23 | 731-687-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | MILLEDGEVL | TN |
| 2014-04-07 | 731-623-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | TIPTONVL | TN |
| 2014-04-04 | 731-442-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | RIDGELY | TN |
| 2014-04-04 | 731-678-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | GREENFIELD | TN |
| 2014-03-27 | 731-419-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | RIPLEY | TN |
| 2014-03-03 | 731-506-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | TN |
| 2014-01-16 | 731-506-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | TN |
| 2013-10-04 | 731-400-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SAVANNAH | TN |
| 2013-06-26 | 731-599-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | UNION CITY | TN |
| 2012-06-01 | 731-418-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | HUNTINGDON | TN |
| 2012-06-01 | 731-732-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | GRAND JCT | TN |
| 2012-01-30 | 731-624-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | TROY | TN |
| 2012-01-05 | 731-882-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | DYERSBURG | TN |
| 2011-10-27 | 731-595-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | HENDERSON | TN |
| 2011-07-21 | 731-613-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | MILAN | TN |
| 2011-02-03 | 731-271-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SO FULTON | TN |
| 2009-05-14 | 731-453-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SELMER | TN |
| 2009-03-09 | 731-503-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | NEWBERN | TN |
| 2009-03-09 | 731-599-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | UNION CITY | TN |
| 2009-03-09 | 731-907-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | HORNBEAK | TN |
| 2008-02-01 | 731-602-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | LEXINGTON | TN |
| 2008-02-01 | 731-602-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | LEXINGTON | TN |
| 2008-01-31 | 731-326-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BROWNSVL | TN |
| 2007-12-04 | 731-334-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | DYERSBURG | TN |
| 2007-09-25 | 731-212-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | BOLIVAR | TN |
| 2007-03-21 | 731-438-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | SAVANNAH | TN |
| 2007-02-15 | 731-324-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | RIPLEY | TN |
| 2007-02-06 | 731-325-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | DYERSBURG | TN |
| 2007-02-01 | 731-256-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | TN |
| 2007-02-01 | 731-256-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | TN |
| 2007-02-01 | 731-256-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | TN |
| 2007-02-01 | 731-256-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JACKSON | 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.