NumberResearchThousands-blocks in 724-556
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 724-556 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 724 blocks
Most active assignees, all time — NPA 724
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-09-12 | 724-556-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | 6392 | SLIPPERYRK | PA |
| — | 724-556-1XXX | 1000–1999 | Reserved | METROPCS, INC. | 5562 | SLIPPERYRK | PA |
| 2018-05-23 | 724-556-2XXX | 2000–2999 | Assigned | CORE COMMUNICATIONS, INC. - PA | 3806 | SLIPPERYRK | PA |
| 2018-05-23 | 724-556-3XXX | 3000–3999 | Assigned | CORE COMMUNICATIONS, INC. - PA | 3806 | SLIPPERYRK | PA |
| 2018-05-23 | 724-556-4XXX | 4000–4999 | Assigned | CORE COMMUNICATIONS, INC. - PA | 3806 | SLIPPERYRK | PA |
| 2018-11-07 | 724-556-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | SLIPPERYRK | PA |
| — | 724-556-6XXX | 6000–6999 | Available | SLIPPERYRK | PA | ||
| 2015-05-13 | 724-556-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SLIPPERYRK | PA |
| 2021-02-11 | 724-556-8XXX | 8000–8999 | Assigned | ONVOY, LLC - PA | 547E | SLIPPERYRK | PA |
| — | 724-556-9XXX | 9000–9999 | Reserved | METROPCS, INC. | 5562 | SLIPPERYRK | PA |
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.