NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 223
ONVOY, LLC - CO 208
NEW CINGULAR WIRELESS PCS, LLC 147
T-MOBILE USA, INC. 69
LEVEL 3 COMMUNICATIONS, LLC - CO 68
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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2012-10-03 303-219-8XXX 8000–8999Assigned ONVOY, LLC - CO 026D DENVER CO
2012-10-03 303-479-3XXX 3000–3999Assigned ONVOY, LLC - CO 026D DENVER CO
2012-10-03 303-498-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D DENVER CO
2012-06-01 303-500-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 HUDSON CO
2012-06-01 303-816-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DECKERS CO
2012-05-31 303-835-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2012-03-09 303-515-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2012-01-27 303-479-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2012-01-24 303-515-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF COLORADO, LLC - CO 4574 DENVER CO
2012-01-10 303-515-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2012-01-10 303-515-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2012-01-04 303-515-3XXX 3000–3999Assigned ONVOY, LLC - CO 026D DENVER CO
2012-01-04 303-515-4XXX 4000–4999Assigned ONVOY, LLC - CO 026D DENVER CO
2012-01-04 303-515-5XXX 5000–5999Assigned ONVOY, LLC - CO 026D DENVER CO
2012-01-04 303-515-6XXX 6000–6999Assigned ONVOY, LLC - CO 026D DENVER CO
2011-11-22 303-515-2XXX 2000–2999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2011-11-18 303-515-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D DENVER CO
2011-10-27 303-647-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DECKERS CO
2011-07-22 303-304-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2011-07-20 303-242-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2011-06-09 303-801-3XXX 3000–3999Assigned LEVEL 3 TELECOM OF COLORADO, LLC - CO 4574 DENVER CO
2011-03-24 303-647-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DECKERS CO
2011-03-08 303-524-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2011-03-02 303-747-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D ALLNSPKLYN CO
2011-02-17 303-569-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 GEORGETOWN CO
2011-02-10 303-747-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 ALLNSPKLYN CO
2010-12-03 303-317-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2010-10-29 303-536-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 HUDSON CO
2010-07-15 303-720-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F FORTLUPTON CO
2010-07-14 303-900-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F GEORGETOWN CO
2010-07-13 303-578-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2010-07-13 303-578-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2010-07-13 303-578-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2010-06-03 303-816-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DECKERS CO
2010-05-13 303-900-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F GEORGETOWN CO
2010-04-26 303-728-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J DENVER CO
2010-04-26 303-900-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F GEORGETOWN CO
2010-04-08 303-927-0XXX 0000–0999Assigned ONVOY, LLC - CO 026D DENVER CO
2010-03-26 303-630-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2010-03-17 303-578-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2010-03-16 303-900-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F GEORGETOWN CO
2010-03-10 303-749-5XXX 5000–5999Assigned ONVOY, LLC - CO 026D DENVER CO
2010-01-20 303-351-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DECKERS CO
2010-01-20 303-578-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2010-01-20 303-900-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F GEORGETOWN CO
2009-12-07 303-351-0XXX 0000–0999Assigned ONVOY, LLC - CO 026D DECKERS CO
2009-12-07 303-900-9XXX 9000–9999Assigned ONVOY, LLC - CO 026D GEORGETOWN CO
2009-12-03 303-219-5XXX 5000–5999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2009-11-13 303-630-0XXX 0000–0999Assigned ONVOY, LLC - CO 026D DENVER CO
2009-11-13 303-630-1XXX 1000–1999Assigned 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.