NumberResearchThousands-blocks in 301-703
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 301-703 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 301 blocks
Most active assignees, all time — NPA 301
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-04-03 | 301-703-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | MOUNT AIRY | MD |
| 2015-08-31 | 301-703-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | MOUNT AIRY | MD |
| 2006-04-24 | 301-703-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | MOUNT AIRY | MD |
| 2009-11-04 | 301-703-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | MOUNT AIRY | MD |
| 2004-10-07 | 301-703-4XXX | 4000–4999 | Assigned | VERIZON MARYLAND, INC. | 9212 | MOUNT AIRY | MD |
| 2012-04-27 | 301-703-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | MOUNT AIRY | MD |
| 2013-05-15 | 301-703-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | 7325 | MOUNT AIRY | MD |
| 2021-10-11 | 301-703-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | MOUNT AIRY | MD |
| 2007-02-26 | 301-703-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | MOUNT AIRY | MD |
| 2005-01-18 | 301-703-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MD | 6119 | MOUNT AIRY | MD |
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.