NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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 720
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 1035
ONVOY, LLC - CO 808
T-MOBILE USA, INC. 798
BANDWIDTH.COM CLEC, LLC - CO 622
NEW CINGULAR WIRELESS PCS, LLC 613
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
2009-09-10 720-396-4XXX 4000–4999Assigned AT&T - LOCAL 7421 DENVER CO
2009-09-10 720-396-5XXX 5000–5999Assigned AT&T - LOCAL 7421 DENVER CO
2009-09-10 720-396-6XXX 6000–6999Assigned AT&T - LOCAL 7421 DENVER CO
2009-09-10 720-396-7XXX 7000–7999Assigned AT&T - LOCAL 7421 DENVER CO
2009-09-10 720-397-4XXX 4000–4999Assigned AT&T - LOCAL 7421 DENVER CO
2009-09-10 720-397-5XXX 5000–5999Assigned AT&T - LOCAL 7421 DENVER CO
2009-09-08 720-340-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2009-09-08 720-395-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CO 7378 DENVER CO
2009-09-08 720-395-9XXX 9000–9999Assigned AT&T - LOCAL 7421 DENVER CO
2009-09-04 720-281-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-09-04 720-951-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-09-02 720-339-2XXX 2000–2999Assigned ONVOY, LLC - CO 026D DENVER CO
2009-09-02 720-346-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D DENVER CO
2009-09-02 720-438-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2009-08-31 720-335-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2009-08-31 720-468-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2009-08-31 720-675-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2009-08-31 720-675-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2009-08-31 720-675-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2009-08-31 720-989-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2009-08-26 720-496-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2009-08-26 720-545-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2009-08-13 720-346-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-346-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-346-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-346-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-383-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2009-08-13 720-545-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-545-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-545-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-545-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-545-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-08-13 720-545-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-07-20 720-438-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2009-07-16 720-216-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2009-07-16 720-975-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2009-07-08 720-514-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-07-08 720-519-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-07-08 720-544-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-07-08 720-940-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-07-08 720-947-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2009-07-08 720-985-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 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.