NumberResearchThousands-blocks in 870-551
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 870-551 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 |
|---|---|---|---|---|---|---|---|
| — | 870-551-0XXX | 0000–0999 | Available | W MEMPHIS | AR | ||
| 2013-05-23 | 870-551-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | W MEMPHIS | AR |
| 2015-02-06 | 870-551-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AR | 5179 | W MEMPHIS | AR |
| 2012-02-02 | 870-551-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - AR | 5179 | W MEMPHIS | AR |
| 2013-06-11 | 870-551-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | W MEMPHIS | AR |
| 2015-02-20 | 870-551-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | W MEMPHIS | AR |
| 2024-12-09 | 870-551-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | W MEMPHIS | AR |
| 2014-12-19 | 870-551-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | W MEMPHIS | AR |
| 2022-07-12 | 870-551-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | W MEMPHIS | AR |
| 2018-10-23 | 870-551-9XXX | 9000–9999 | Assigned | TELNYX LLC | 073H | W MEMPHIS | AR |
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.