NumberResearchThousands-blocks in 253-237
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 253-237 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 253 blocks
Most active assignees, all time — NPA 253
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 253-237-0XXX | 0000–0999 | Reserved | ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM | 7173 | DES MOINES | WA |
| 2008-07-16 | 253-237-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WA | 6121 | DES MOINES | WA |
| 2010-01-22 | 253-237-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | DES MOINES | WA |
| 2010-01-22 | 253-237-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | DES MOINES | WA |
| 2010-01-22 | 253-237-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | DES MOINES | WA |
| 2003-12-30 | 253-237-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | DES MOINES | WA |
| 2012-02-21 | 253-237-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - WA | 006F | DES MOINES | WA |
| 2014-08-29 | 253-237-7XXX | 7000–7999 | Assigned | ONVOY, LLC - WA | 483E | DES MOINES | WA |
| 2014-10-20 | 253-237-8XXX | 8000–8999 | Assigned | PEERLESS NETWORK OF WASHINGTON, LLC - WA | 159F | DES MOINES | WA |
| 2009-03-31 | 253-237-9XXX | 9000–9999 | Assigned | ONVOY, LLC - WA | 483E | DES MOINES | WA |
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.