NumberResearchThousands-blocks in 256-598
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 256-598 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 256 blocks
Most active assignees, all time — NPA 256
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 256-598-0XXX | 0000–0999 | Reserved | PAETEC ITEL, LLC | 829J | CHILDERSBG | AL |
| — | 256-598-1XXX | 1000–1999 | Reserved | PAETEC ITEL, LLC | 829J | CHILDERSBG | AL |
| — | 256-598-2XXX | 2000–2999 | Reserved | PAETEC ITEL, LLC | 829J | CHILDERSBG | AL |
| 2017-01-18 | 256-598-3XXX | 3000–3999 | Assigned | ONVOY, LLC - AL | 604E | CHILDERSBG | AL |
| — | 256-598-4XXX | 4000–4999 | Reserved | PAETEC ITEL, LLC | 829J | CHILDERSBG | AL |
| 2020-12-16 | 256-598-5XXX | 5000–5999 | Assigned | ONVOY, LLC - AL | 604E | CHILDERSBG | AL |
| — | 256-598-6XXX | 6000–6999 | Reserved | PAETEC ITEL, LLC | 829J | CHILDERSBG | AL |
| 2014-02-25 | 256-598-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHILDERSBG | AL |
| 2016-02-09 | 256-598-8XXX | 8000–8999 | Assigned | ONVOY, LLC - AL | 604E | CHILDERSBG | AL |
| 2016-02-09 | 256-598-9XXX | 9000–9999 | Assigned | ONVOY, LLC - AL | 604E | CHILDERSBG | AL |
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.