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 231
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2012-05-14 | 231-291-0XXX | 0000–0999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-1XXX | 1000–1999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-2XXX | 2000–2999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-3XXX | 3000–3999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-4XXX | 4000–4999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-5XXX | 5000–5999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-6XXX | 6000–6999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-7XXX | 7000–7999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-8XXX | 8000–8999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2012-05-14 | 231-291-9XXX | 9000–9999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MUSKEGON | MI |
| 2005-08-03 | 231-242-2XXX | 2000–2999 | Assigned | TELNET WORLDWIDE, INC. | 817J | HARBOR SPG | MI |
| 2005-08-03 | 231-267-1XXX | 1000–1999 | Assigned | TELNET WORLDWIDE, INC. | 817J | WILLIAMSBG | MI |
| 2005-08-03 | 231-301-7XXX | 7000–7999 | Assigned | TELNET WORLDWIDE, INC. | 817J | HART | MI |
| 2005-08-03 | 231-345-3XXX | 3000–3999 | Assigned | TELNET WORLDWIDE, INC. | 817J | REED CITY | MI |
| 2005-08-03 | 231-350-4XXX | 4000–4999 | Assigned | TELNET WORLDWIDE, INC. | 817J | BELLAIRE | MI |
| 2005-08-03 | 231-450-1XXX | 1000–1999 | Assigned | TELNET WORLDWIDE, INC. | 817J | HESPERIA | MI |
| 2005-08-03 | 231-459-2XXX | 2000–2999 | Assigned | TELNET WORLDWIDE, INC. | 817J | BOYNE CITY | MI |
| 2005-08-03 | 231-462-4XXX | 4000–4999 | Assigned | TELNET WORLDWIDE, INC. | 817J | FOUNTAIN | MI |
| 2005-08-03 | 231-464-0XXX | 0000–0999 | Assigned | TELNET WORLDWIDE, INC. | 817J | FREESOIL | MI |
| 2005-08-03 | 231-535-4XXX | 4000–4999 | Assigned | TELNET WORLDWIDE, INC. | 817J | WALLOON LK | MI |
| 2005-08-03 | 231-539-5XXX | 5000–5999 | Assigned | TELNET WORLDWIDE, INC. | 817J | PELLSTON | MI |
| 2005-08-03 | 231-774-0XXX | 0000–0999 | Assigned | TELNET WORLDWIDE, INC. | 817J | INTERLOCHN | MI |
| 2005-08-03 | 231-793-3XXX | 3000–3999 | Assigned | TELNET WORLDWIDE, INC. | 817J | WHITECLOUD | MI |
| 2005-08-03 | 231-824-5XXX | 5000–5999 | Assigned | TELNET WORLDWIDE, INC. | 817J | MANTON | MI |
| 2005-08-03 | 231-844-3XXX | 3000–3999 | Assigned | TELNET WORLDWIDE, INC. | 817J | INDIAN RIV | MI |
| 2005-08-03 | 231-981-4XXX | 4000–4999 | Assigned | TELNET WORLDWIDE, INC. | 817J | WHITEHALL | MI |
| 2005-08-03 | 231-994-0XXX | 0000–0999 | Assigned | TELNET WORLDWIDE, INC. | 817J | LKLEELANAU | MI |
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.