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
2004-08-05 303-261-3XXX 3000–3999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-07-29 303-339-1XXX 1000–1999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-07-29 303-339-2XXX 2000–2999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-07-29 303-339-9XXX 9000–9999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-07-19 303-872-1XXX 1000–1999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-07-16 303-746-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2004-07-16 303-746-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2004-06-09 303-339-6XXX 6000–6999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-06-09 303-339-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-06-09 303-339-8XXX 8000–8999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-06-08 303-350-5XXX 5000–5999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2004-06-08 303-842-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-06-08 303-842-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-06-08 303-842-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-06-08 303-842-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-06-08 303-842-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-05-18 303-345-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-05-18 303-552-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-05-18 303-746-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2004-04-30 303-328-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-27 303-328-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-21 303-345-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-04-14 303-496-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-1XXX 1000–1999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-14 303-496-9XXX 9000–9999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-08 303-350-4XXX 4000–4999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2004-03-23 303-647-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DECKERS CO
2004-03-16 303-815-1XXX 1000–1999Assigned INTERLINK ADV SVC DBA FORETHOUGHT.NET - CO 5972 DENVER CO
2004-03-12 303-339-4XXX 4000–4999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-03-12 303-339-5XXX 5000–5999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-02-03 303-327-4XXX 4000–4999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-02-03 303-327-5XXX 5000–5999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-02-03 303-327-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-01-07 303-345-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-01-07 303-345-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2003-11-21 303-710-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2003-11-21 303-718-8XXX 8000–8999Assigned METROPCS, INC. 5562 FORTLUPTON CO
2003-11-12 303-345-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2003-11-12 303-345-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2003-11-12 303-468-5XXX 5000–5999Assigned ONVOY, LLC - CO 026D DENVER CO
2003-11-12 303-468-6XXX 6000–6999Assigned ONVOY, LLC - CO 026D DENVER CO
2003-11-12 303-468-7XXX 7000–7999Assigned ONVOY, LLC - CO 026D DENVER CO
2003-11-12 303-468-8XXX 8000–8999Assigned 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.