NumberResearchRecent thousands-block assignments
6 blocks assigned in May 2026 · 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, May 2026 — NPA 641
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-05-28 | 641-255-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MASON CITY | IA |
| 2026-05-19 | 641-266-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | ACKLEY | IA |
| 2026-05-18 | 641-266-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ACKLEY | IA |
| 2026-05-12 | 641-860-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BRITT | IA |
| 2026-05-07 | 641-674-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 6570 | CENTERVL | IA |
| 2026-05-06 | 641-250-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MANLY | IA |
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.