NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 |
|---|---|---|---|---|---|---|---|
| 2019-10-08 | 303-529-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2019-10-08 | 303-529-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2019-10-08 | 303-529-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2019-10-08 | 303-529-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2019-10-08 | 303-529-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2019-10-08 | 303-529-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2019-10-08 | 303-529-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2019-06-10 | 303-710-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CO | 078F | FORTLUPTON | CO |
| 2019-05-28 | 303-502-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CO | 026D | FORTLUPTON | CO |
| 2019-04-25 | 303-656-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2017-03-13 | 303-647-3XXX | 3000–3999 | Assigned | TELNYX LLC | 073H | DECKERS | CO |
| 2016-03-21 | 303-645-3XXX | 3000–3999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DENVER | CO |
| 2015-09-30 | 303-824-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | 6567 | DENVER | CO |
| 2015-07-10 | 303-676-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DENVER | CO |
| 2015-07-07 | 303-830-4XXX | 4000–4999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | DENVER | CO |
| 2015-06-23 | 303-661-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | 6567 | DENVER | CO |
| 2015-05-08 | 303-597-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DENVER | CO |
| 2015-05-08 | 303-597-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DENVER | CO |
| 2015-04-03 | 303-676-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
| 2014-08-28 | 303-990-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | FORTLUPTON | CO |
| 2014-07-16 | 303-536-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CO | 078F | HUDSON | CO |
| 2014-05-19 | 303-536-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CO | 026D | HUDSON | CO |
| 2014-04-07 | 303-710-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | 6567 | FORTLUPTON | CO |
| 2014-03-19 | 303-536-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CO | 078F | HUDSON | CO |
| 2013-12-18 | 303-536-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | HUDSON | CO |
| 2013-10-23 | 303-622-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CO | 026D | STRASBURG | CO |
| 2013-10-23 | 303-622-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CO | 026D | STRASBURG | CO |
| 2013-07-10 | 303-598-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | 6567 | DENVER | CO |
| 2013-01-30 | 303-632-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2013-01-30 | 303-632-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2012-12-11 | 303-749-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
| 2012-11-29 | 303-802-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DENVER | CO |
| 2012-11-29 | 303-802-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DENVER | CO |
| 2012-11-29 | 303-802-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DENVER | CO |
| 2012-11-29 | 303-802-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | DENVER | CO |
| 2012-11-29 | 303-802-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DENVER | CO |
| 2012-11-19 | 303-802-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
| 2012-11-19 | 303-802-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
| 2012-11-19 | 303-802-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DENVER | CO |
| 2012-11-14 | 303-505-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-11-14 | 303-505-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| 2012-10-03 | 303-219-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CO | 026D | DENVER | CO |
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.