NumberResearchThousands-blocks in 870-353
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 870-353 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 870 blocks
Most active assignees, all time — NPA 870
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 |
|---|---|---|---|---|---|---|---|
| 2006-12-21 | 870-353-0XXX | 0000–0999 | Assigned | TCA COMMUNICATIONS, LLC DBA SUDDENLINK COMM - AR | 048G | GURDON | AR |
| — | 870-353-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | GURDON | AR |
| — | 870-353-2XXX | 2000–2999 | Reserved | SOUTHWESTERN BELL | 9533 | GURDON | AR |
| 2017-08-18 | 870-353-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AR | 5179 | GURDON | AR |
| — | 870-353-4XXX | 4000–4999 | Reserved | SOUTHWESTERN BELL | 9533 | GURDON | AR |
| — | 870-353-5XXX | 5000–5999 | Reserved | SOUTHWESTERN BELL | 9533 | GURDON | AR |
| — | 870-353-6XXX | 6000–6999 | Reserved | SOUTHWESTERN BELL | 9533 | GURDON | AR |
| — | 870-353-7XXX | 7000–7999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GURDON | AR |
| — | 870-353-8XXX | 8000–8999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | GURDON | AR |
| 2018-11-26 | 870-353-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - AR | 196F | GURDON | AR |
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.