NumberResearchThousands-blocks in 815-661
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 815-661 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 815 blocks
Most active assignees, all time — NPA 815
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-10-14 | 815-661-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | MORRIS | IL |
| 2008-10-14 | 815-661-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | MORRIS | IL |
| 2010-04-09 | 815-661-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | MORRIS | IL |
| — | 815-661-3XXX | 3000–3999 | Reserved | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | MORRIS | IL |
| 2017-05-31 | 815-661-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | MORRIS | IL |
| 2015-04-21 | 815-661-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | MORRIS | IL |
| 2015-04-21 | 815-661-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | MORRIS | IL |
| 2013-06-04 | 815-661-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MORRIS | IL |
| 2014-04-08 | 815-661-8XXX | 8000–8999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | MORRIS | IL |
| 2017-05-31 | 815-661-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | MORRIS | IL |
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.