NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, all time — NPA 303
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2010-04-26 | 303-728-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2009-08-13 | 303-558-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2009-05-19 | 303-658-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2008-04-15 | 303-834-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | LONGMONT | CO |
| 2007-08-29 | 303-999-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-07-03 | 303-993-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-07-03 | 303-993-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-07-03 | 303-993-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-07-03 | 303-993-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-07-03 | 303-993-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-07-03 | 303-993-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-07-03 | 303-993-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-05-03 | 303-862-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-05-03 | 303-862-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-05-03 | 303-945-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-05-03 | 303-974-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-15 | 303-635-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-15 | 303-997-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-15 | 303-997-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-15 | 303-997-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-15 | 303-997-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-15 | 303-997-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-15 | 303-997-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-08 | 303-856-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-02-08 | 303-856-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-01-17 | 303-835-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-01-11 | 303-353-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-01-11 | 303-481-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-01-11 | 303-834-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | LONGMONT | CO |
| 2007-01-11 | 303-872-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2007-01-11 | 303-923-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-11-30 | 303-955-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-11-30 | 303-963-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-11-30 | 303-975-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-17 | 303-569-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | GEORGETOWN | CO |
| 2006-07-06 | 303-952-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-953-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-953-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-953-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-953-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-953-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-954-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-954-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-954-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-07-06 | 303-955-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-06-06 | 303-955-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-06-06 | 303-955-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-06-06 | 303-955-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-06-06 | 303-955-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
| 2006-06-06 | 303-955-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DENVER | CO |
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.