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 661
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 |
|---|---|---|---|---|---|---|---|
| 2017-12-08 | 661-357-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TEHACHAPI | CA |
| 2017-12-08 | 661-357-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TEHACHAPI | CA |
| 2017-12-08 | 661-357-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TEHACHAPI | CA |
| 2017-12-08 | 661-357-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TEHACHAPI | CA |
| 2017-12-08 | 661-357-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TEHACHAPI | CA |
| 2017-12-08 | 661-357-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TEHACHAPI | CA |
| 2017-12-08 | 661-357-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TEHACHAPI | CA |
| 2017-12-08 | 661-359-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | DELANO | CA |
| 2017-12-06 | 661-353-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | LANCASTER | CA |
| 2017-12-06 | 661-353-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | LANCASTER | CA |
| 2017-12-04 | 661-355-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | ROSAMOND | CA |
| 2017-12-04 | 661-355-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | ROSAMOND | CA |
| 2017-12-04 | 661-355-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | ROSAMOND | CA |
| 2017-12-04 | 661-355-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | ROSAMOND | CA |
| 2017-12-04 | 661-355-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | ROSAMOND | CA |
| 2017-12-04 | 661-355-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | ROSAMOND | CA |
| 2017-12-01 | 661-207-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SNCA NHCS | CA |
| 2017-12-01 | 661-207-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SNCA NHCS | CA |
| 2017-12-01 | 661-207-8XXX | 8000–8999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | SNCA NHCS | CA |
| 2017-12-01 | 661-771-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TEHACHAPI | CA |
| 2017-11-30 | 661-351-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | LAKEHUGHES | CA |
| 2017-11-30 | 661-351-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | LAKEHUGHES | CA |
| 2017-11-29 | 661-354-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
| 2017-11-29 | 661-354-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
| 2017-11-29 | 661-354-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
| 2017-11-29 | 661-354-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
| 2017-11-29 | 661-354-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
| 2017-11-29 | 661-354-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
| 2017-11-29 | 661-354-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BKFD MAIN | CA |
| 2017-11-29 | 661-356-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MOJAVE | CA |
| 2017-11-29 | 661-356-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MOJAVE | CA |
| 2017-11-29 | 661-356-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MOJAVE | CA |
| 2017-11-29 | 661-356-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MOJAVE | CA |
| 2017-11-29 | 661-356-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MOJAVE | CA |
| 2017-11-29 | 661-356-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MOJAVE | CA |
| 2017-11-29 | 661-356-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MOJAVE | CA |
| 2017-11-29 | 661-358-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TAFT | CA |
| 2017-11-29 | 661-358-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TAFT | CA |
| 2017-11-29 | 661-358-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TAFT | CA |
| 2017-11-29 | 661-358-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TAFT | CA |
| 2017-11-29 | 661-358-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TAFT | CA |
| 2017-11-29 | 661-358-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TAFT | CA |
| 2017-11-29 | 661-358-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | TAFT | CA |
| 2017-11-29 | 661-359-1XXX | 1000–1999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | DELANO | CA |
| 2017-11-29 | 661-359-2XXX | 2000–2999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | DELANO | CA |
| 2017-11-29 | 661-359-3XXX | 3000–3999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | DELANO | CA |
| 2017-11-29 | 661-359-4XXX | 4000–4999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | DELANO | CA |
| 2017-11-29 | 661-359-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | DELANO | CA |
| 2017-11-29 | 661-359-6XXX | 6000–6999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | DELANO | CA |
| 2017-11-28 | 661-352-0XXX | 0000–0999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | EDWARDS | CA |
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.