NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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
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Jun 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2020-10-22 | 303-586-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2013-12-18 | 303-536-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | HUDSON | CO |
| 2012-06-01 | 303-500-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | HUDSON | CO |
| 2012-06-01 | 303-816-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DECKERS | CO |
| 2012-05-31 | 303-835-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2012-01-27 | 303-479-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2011-10-27 | 303-647-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DECKERS | CO |
| 2011-03-24 | 303-647-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DECKERS | CO |
| 2011-02-17 | 303-569-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | GEORGETOWN | CO |
| 2011-02-10 | 303-747-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | ALLNSPKLYN | CO |
| 2010-10-29 | 303-536-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | HUDSON | CO |
| 2008-05-19 | 303-500-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | HUDSON | CO |
| 2008-05-19 | 303-578-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | KEENESBURG | CO |
| 2008-05-07 | 303-351-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DECKERS | CO |
| 2008-05-07 | 303-990-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | FORTLUPTON | CO |
| 2008-05-06 | 303-261-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2008-01-31 | 303-586-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2008-01-31 | 303-586-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2008-01-31 | 303-586-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2008-01-22 | 303-586-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2007-11-20 | 303-309-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2007-05-09 | 303-578-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | KEENESBURG | CO |
| 2007-01-11 | 303-900-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | GEORGETOWN | CO |
| 2006-08-02 | 303-647-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DECKERS | CO |
| 2006-06-28 | 303-835-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2006-06-28 | 303-945-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2006-06-28 | 303-974-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2006-06-15 | 303-500-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | HUDSON | CO |
| 2006-04-28 | 303-502-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | FORTLUPTON | CO |
| 2006-04-20 | 303-569-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | GEORGETOWN | CO |
| 2006-04-07 | 303-747-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | ALLNSPKLYN | CO |
| 2006-03-03 | 303-502-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | FORTLUPTON | CO |
| 2005-12-07 | 303-732-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | KEENESBURG | CO |
| 2005-12-05 | 303-500-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | HUDSON | CO |
| 2005-11-09 | 303-867-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-09-26 | 303-872-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-09-26 | 303-872-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-09-26 | 303-872-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-09-26 | 303-872-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-08-19 | 303-835-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-08-19 | 303-835-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-06-01 | 303-731-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-06-01 | 303-731-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-06-01 | 303-731-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-06-01 | 303-731-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-02-10 | 303-835-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-02-10 | 303-872-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-01-26 | 303-952-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-01-21 | 303-242-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
| 2005-01-21 | 303-242-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | DENVER | CO |
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.