NumberResearchThousands-blocks in 435-800
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 435-800 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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2017-09-01 | 435-800-0XXX | 0000–0999 | Assigned | ONVOY, LLC - UT | 871E | PARK CITY | UT |
| 2018-09-25 | 435-800-1XXX | 1000–1999 | Assigned | ONVOY, LLC - UT | 871E | PARK CITY | UT |
| 2017-10-25 | 435-800-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | PARK CITY | UT |
| 2018-11-28 | 435-800-3XXX | 3000–3999 | Assigned | PEERLESS NETWORK OF UTAH, LLC - UT | 526H | PARK CITY | UT |
| 2022-07-14 | 435-800-4XXX | 4000–4999 | Assigned | VONAGE AMERICA LLC | 197D | PARK CITY | UT |
| 2023-04-06 | 435-800-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT | 6571 | PARK CITY | UT |
| 2020-03-27 | 435-800-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF UTAH, LLC - UT | 526H | PARK CITY | UT |
| 2018-12-13 | 435-800-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PARK CITY | UT |
| 2017-09-01 | 435-800-8XXX | 8000–8999 | Assigned | ONVOY, LLC - UT | 871E | PARK CITY | UT |
| 2018-12-13 | 435-800-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PARK CITY | UT |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.