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
2004-12-02 303-547-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-12-02 303-547-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-11-24 303-304-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FORTLUPTON CO
2004-11-24 303-304-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FORTLUPTON CO
2004-11-16 303-835-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2004-11-15 303-350-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-11-10 303-532-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 LONGMONT CO
2004-10-28 303-261-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-28 303-261-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-28 303-261-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-28 303-872-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2004-10-26 303-532-0XXX 0000–0999Assigned ONVOY, LLC - CO 026D LONGMONT CO
2004-10-26 303-842-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-26 303-847-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-26 303-847-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-26 303-847-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-26 303-847-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-26 303-847-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-26 303-847-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-26 303-847-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-26 303-847-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2004-10-22 303-532-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 LONGMONT CO
2004-10-20 303-319-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-10-20 303-319-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-10-20 303-319-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-10-20 303-319-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-10-20 303-319-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-10-20 303-718-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FORTLUPTON CO
2004-10-14 303-731-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2004-10-13 303-536-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 HUDSON CO
2004-10-13 303-569-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 GEORGETOWN CO
2004-10-13 303-647-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DECKERS CO
2004-10-13 303-732-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 KEENESBURG CO
2004-10-13 303-747-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 ALLNSPKLYN CO
2004-10-13 303-857-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 FORTLUPTON CO
2004-10-11 303-731-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2004-10-08 303-746-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2004-10-08 303-746-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2004-10-08 303-746-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2004-10-06 303-217-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-10-06 303-335-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-10-06 303-335-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2004-10-06 303-718-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FORTLUPTON CO
2004-10-04 303-847-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2004-09-30 303-350-1XXX 1000–1999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-09-30 303-350-2XXX 2000–2999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-09-17 303-217-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-09-17 303-217-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-08-18 303-718-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FORTLUPTON CO
2004-08-16 303-319-7XXX 7000–7999Assigned ELBERT COUNTY WIRELESS, LLC 765B 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.