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
2008-08-01 303-990-9XXX 9000–9999Assigned ONVOY, LLC - CO 026D FORTLUPTON CO
2008-07-30 303-306-8XXX 8000–8999Assigned ONVOY, LLC - CO 026D DENVER CO
2008-07-30 303-923-5XXX 5000–5999Assigned ONVOY, LLC - CO 026D DENVER CO
2008-07-30 303-923-8XXX 8000–8999Assigned ONVOY, LLC - CO 026D DENVER CO
2008-07-17 303-834-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LONGMONT CO
2008-06-25 303-586-6XXX 6000–6999Assigned ONVOY, LLC - CO 026D DENVER CO
2008-06-25 303-586-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D DENVER CO
2008-06-16 303-720-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2008-06-03 303-586-5XXX 5000–5999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2008-05-22 303-999-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2008-05-22 303-999-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2008-05-19 303-500-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 HUDSON CO
2008-05-19 303-578-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 KEENESBURG CO
2008-05-07 303-351-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DECKERS CO
2008-05-07 303-990-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 FORTLUPTON CO
2008-05-06 303-261-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2008-05-02 303-999-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2008-05-02 303-999-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2008-05-02 303-999-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2008-05-02 303-999-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2008-05-01 303-834-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF COLORADO, LLC - CO 4574 LONGMONT CO
2008-04-25 303-999-4XXX 4000–4999Assigned LEVEL 3 TELECOM OF COLORADO, LLC - CO 4574 DENVER CO
2008-04-15 303-834-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J LONGMONT CO
2008-04-03 303-999-3XXX 3000–3999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2008-02-15 303-834-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LONGMONT CO
2008-02-14 303-990-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2008-01-31 303-586-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2008-01-31 303-586-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2008-01-31 303-586-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2008-01-23 303-999-2XXX 2000–2999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2008-01-22 303-586-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2007-12-20 303-990-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2007-12-10 303-834-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LONGMONT CO
2007-11-20 303-309-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2007-10-17 303-566-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J DENVER CO
2007-10-12 303-763-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-10-12 303-763-1XXX 1000–1999Assigned ONVOY, LLC - CO 026D DENVER CO
2007-10-09 303-834-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LONGMONT CO
2007-09-20 303-218-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-218-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-243-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-248-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-301-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-305-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-362-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-374-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-385-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-406-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-09-20 303-493-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2007-08-29 303-264-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 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.