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
2010-09-09 720-454-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2010-09-09 720-454-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2010-09-09 720-454-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2010-09-09 720-454-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2010-09-08 720-325-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2010-09-08 720-325-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2010-09-01 720-398-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2010-09-01 720-398-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2010-08-26 720-358-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F HUDSON CO
2010-08-20 720-398-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J DENVER CO
2010-08-20 720-398-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J DENVER CO
2010-08-20 720-420-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J DENVER CO
2010-08-20 720-420-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J DENVER CO
2010-08-20 720-440-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J DENVER CO
2010-08-19 720-263-3XXX 3000–3999Assigned ONVOY, LLC - CO 026D DENVER CO
2010-08-19 720-440-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J DENVER CO
2010-08-17 720-325-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2010-08-12 720-325-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2010-08-11 720-454-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J DENVER CO
2010-08-10 720-466-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J FORTLUPTON CO
2010-08-09 720-325-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2010-08-09 720-325-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2010-08-05 720-340-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2010-08-05 720-393-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-08-05 720-393-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-08-05 720-440-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DENVER CO
2010-08-03 720-466-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 FORTLUPTON CO
2010-08-02 720-288-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2010-08-02 720-288-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2010-08-02 720-288-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2010-07-26 720-336-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2010-07-23 720-420-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J DENVER CO
2010-07-23 720-420-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J DENVER CO
2010-07-20 720-336-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2010-07-20 720-336-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F KEENESBURG CO
2010-07-20 720-608-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F GEORGETOWN CO
2010-07-15 720-378-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D LONGMONT CO
2010-07-15 720-420-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2010-07-15 720-420-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2010-07-15 720-523-8XXX 8000–8999Assigned ONVOY, LLC - CO 026D DENVER CO
2010-07-14 720-924-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CO 078F DECKERS CO
2010-07-13 720-378-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LONGMONT CO
2010-07-13 720-378-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LONGMONT CO
2010-07-12 720-358-8XXX 8000–8999Assigned ONVOY, LLC - CO 026D HUDSON CO
2010-07-08 720-412-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-07-08 720-412-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-07-08 720-412-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-07-08 720-412-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-07-08 720-412-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2010-07-06 720-455-0XXX 0000–0999Assigned QWEST CORPORATION 9636 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.