NumberResearchThousands-blocks in 661-309
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 661-309 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 661 blocks
Most active assignees, all time — NPA 661
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2006-09-17 | 661-309-0XXX | 0000–0999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| — | 661-309-1XXX | 1000–1999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNCA SGCC | CA |
| 2004-01-08 | 661-309-2XXX | 2000–2999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| 2004-12-07 | 661-309-3XXX | 3000–3999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| 2013-07-22 | 661-309-4XXX | 4000–4999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNCA SGCC | CA |
| 2005-12-06 | 661-309-5XXX | 5000–5999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| 2016-02-19 | 661-309-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNCA SGCC | CA |
| 2004-01-15 | 661-309-7XXX | 7000–7999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| 2006-05-31 | 661-309-8XXX | 8000–8999 | Assigned | METROPCS NETWORKS, LLC | 899D | SNCA SGCC | CA |
| — | 661-309-9XXX | 9000–9999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNCA SGCC | 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.