NumberResearchThousands-blocks in 203-930
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 203-930 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 203 blocks
Most active assignees, all time — NPA 203
New assignments by month
Sep 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-10-14 | 203-930-0XXX | 0000–0999 | Assigned | YMAX COMMUNICATIONS CORP. - CT | 350E | GREENWICH | CT |
| 2010-04-15 | 203-930-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CT | 4800 | GREENWICH | CT |
| — | 203-930-2XXX | 2000–2999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - CT | 4800 | GREENWICH | CT |
| — | 203-930-3XXX | 3000–3999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - CT | 4800 | GREENWICH | CT |
| 2021-10-13 | 203-930-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | GREENWICH | CT |
| — | 203-930-5XXX | 5000–5999 | Reserved | ONVOY, LLC - CT | 639C | GREENWICH | CT |
| 2009-01-27 | 203-930-6XXX | 6000–6999 | Assigned | YMAX COMMUNICATIONS CORP. - CT | 350E | GREENWICH | CT |
| 2008-09-08 | 203-930-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT | 7316 | GREENWICH | CT |
| 2008-05-05 | 203-930-8XXX | 8000–8999 | Assigned | YMAX COMMUNICATIONS CORP. - CT | 350E | GREENWICH | CT |
| 2025-03-11 | 203-930-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GREENWICH | CT |
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.