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 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2005-03-18 303-803-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2005-03-18 303-803-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2005-03-18 303-803-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2005-02-10 303-835-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2005-02-10 303-872-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2005-02-09 303-304-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 FORTLUPTON CO
2005-02-09 303-827-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2005-02-08 303-653-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2005-02-08 303-653-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2005-02-08 303-653-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2005-02-08 303-653-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2005-01-28 303-459-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2005-01-28 303-459-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2005-01-28 303-648-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2005-01-28 303-648-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2005-01-28 303-648-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2005-01-27 303-974-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 DENVER CO
2005-01-26 303-952-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2005-01-21 303-242-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2005-01-21 303-242-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 DENVER CO
2005-01-20 303-328-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-328-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-328-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-328-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-524-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-524-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-524-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-547-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-552-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-20 303-552-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 DENVER CO
2005-01-18 303-524-3XXX 3000–3999Assigned PAETEC ITEL, LLC 829J DENVER CO
2005-01-14 303-565-1XXX 1000–1999Assigned ONVOY, LLC - CO 026D DENVER CO
2005-01-14 303-565-2XXX 2000–2999Assigned ONVOY, LLC - CO 026D DENVER CO
2005-01-10 303-953-3XXX 3000–3999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2005-01-07 303-217-8XXX 8000–8999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 3467 DENVER CO
2005-01-05 303-562-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-12-28 303-562-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-12-28 303-562-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-12-28 303-562-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-12-15 303-848-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CO 6118 LONGMONT CO
2004-12-15 303-872-2XXX 2000–2999Assigned INTERLINK ADV SVC DBA FORETHOUGHT.NET - CO 5972 DENVER CO
2004-12-09 303-827-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2004-12-09 303-827-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LONGMONT CO
2004-12-06 303-304-2XXX 2000–2999Assigned METROPCS, INC. 5562 FORTLUPTON CO
2004-12-02 303-327-8XXX 8000–8999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-12-02 303-350-3XXX 3000–3999Assigned ONVOY, LLC - CO 026D DENVER CO
2004-12-02 303-547-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-12-02 303-547-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-12-02 303-547-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2004-12-02 303-547-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 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.