NumberResearchThousands-blocks in 435-610
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 435-610 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 435 blocks
Most active assignees, all time — NPA 435
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 435-610-0XXX | 0000–0999 | Reserved | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT | 6571 | NEPHI | UT |
| 2008-10-30 | 435-610-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - UT | 117F | NEPHI | UT |
| 2014-11-19 | 435-610-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - UT | 117F | NEPHI | UT |
| 2018-11-28 | 435-610-3XXX | 3000–3999 | Assigned | PEERLESS NETWORK OF UTAH, LLC - UT | 526H | NEPHI | UT |
| 2019-12-16 | 435-610-4XXX | 4000–4999 | Assigned | VONAGE AMERICA LLC | 197D | NEPHI | UT |
| 2016-10-12 | 435-610-5XXX | 5000–5999 | Assigned | FIRSTDIGITAL COMMUNICATIONS, LLC | 716D | NEPHI | UT |
| 2012-06-11 | 435-610-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT | 6571 | NEPHI | UT |
| 2013-12-06 | 435-610-7XXX | 7000–7999 | Assigned | ONVOY, LLC - UT | 871E | NEPHI | UT |
| 2013-12-06 | 435-610-8XXX | 8000–8999 | Assigned | ONVOY, LLC - UT | 871E | NEPHI | UT |
| 2022-01-26 | 435-610-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | NEPHI | UT |
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.