NumberResearchThousands-blocks in 641-278
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 641-278 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 641 blocks
Most active assignees, all time — NPA 641
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2007-08-22 | 641-278-0XXX | 0000–0999 | Assigned | UNITED STATES CELLULAR - IA | 6266 | CRESTON | IA |
| 2010-03-02 | 641-278-1XXX | 1000–1999 | Assigned | MCC TELEPHONY OF IOWA, LLC - IA | 751F | CRESTON | IA |
| 2017-04-05 | 641-278-2XXX | 2000–2999 | Assigned | IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY | 9572 | CRESTON | IA |
| 2017-04-07 | 641-278-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CRESTON | IA |
| 2012-01-12 | 641-278-4XXX | 4000–4999 | Assigned | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | CRESTON | IA |
| — | 641-278-5XXX | 5000–5999 | Available | CRESTON | IA | ||
| 2011-09-12 | 641-278-6XXX | 6000–6999 | Assigned | UNITED STATES CELLULAR - IA | 6266 | CRESTON | IA |
| 2017-02-16 | 641-278-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CRESTON | IA |
| 2011-10-04 | 641-278-8XXX | 8000–8999 | Assigned | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 1167 | CRESTON | IA |
| 2013-12-12 | 641-278-9XXX | 9000–9999 | Assigned | AUREON COMMUNICATIONS, LLC | 444G | CRESTON | 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.