NumberResearchThousands-blocks in 936-257
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 936-257 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 936 blocks
Most active assignees, all time — NPA 936
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 936-257-0XXX | 0000–0999 | Reserved | SOUTHWESTERN BELL | 9533 | DAYTON | TX |
| — | 936-257-1XXX | 1000–1999 | Reserved | SOUTHWESTERN BELL | 9533 | DAYTON | TX |
| 2016-11-30 | 936-257-2XXX | 2000–2999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | DAYTON | TX |
| 2018-05-09 | 936-257-3XXX | 3000–3999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | DAYTON | TX |
| — | 936-257-4XXX | 4000–4999 | Reserved | SOUTHWESTERN BELL | 9533 | DAYTON | TX |
| 2011-01-07 | 936-257-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DAYTON | TX |
| 2013-02-15 | 936-257-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | DAYTON | TX |
| 2010-10-29 | 936-257-7XXX | 7000–7999 | Assigned | ONVOY, LLC - TX | 903C | DAYTON | TX |
| — | 936-257-8XXX | 8000–8999 | Reserved | SOUTHWESTERN BELL | 9533 | DAYTON | TX |
| — | 936-257-9XXX | 9000–9999 | Reserved | SOUTHWESTERN BELL | 9533 | DAYTON | TX |
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.