NumberResearchThousands-blocks in 203-713
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026
The ten 1,000-number thousand-blocks inside prefix 203-713 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, last 30 days — NPA 203
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-07-11 | 203-713-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | MILFORD | CT |
| 2004-05-18 | 203-713-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | MILFORD | CT |
| 2025-06-30 | 203-713-2XXX | 2000–2999 | Assigned | TERRA NOVA TELECOM INC. | 145J | MILFORD | CT |
| 2026-08-27 | 203-713-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CT | 639C | MILFORD | CT |
| 2026-07-08 | 203-713-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CT | 639C | MILFORD | CT |
| 2020-10-23 | 203-713-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CT | 639C | MILFORD | CT |
| 2006-06-20 | 203-713-6XXX | 6000–6999 | Assigned | SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | MILFORD | CT |
| 2009-04-02 | 203-713-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | MILFORD | CT |
| 2010-05-26 | 203-713-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | MILFORD | CT |
| 2021-05-05 | 203-713-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CT | 639C | MILFORD | CT |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.