NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

16 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, last 30 days — NPA 385
LEVEL 3 COMMUNICATIONS, LLC - UT 5
BANDWIDTH.COM CLEC, LLC - UT 5
NEW CINGULAR WIRELESS PCS, LLC 4
ONVOY, LLC - UT 2
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
2010-12-03 385-628-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
2010-12-03 385-628-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
2010-12-03 385-628-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
2010-12-03 385-628-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALT LAKE UT
2010-11-18 385-628-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-11-18 385-628-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-11-15 385-628-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-11-05 385-232-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-11-03 385-232-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F SALT LAKE UT
2010-11-01 385-232-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2010-09-16 385-208-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
2010-09-16 385-232-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2010-09-16 385-232-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 SALT LAKE UT
2010-09-08 385-208-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PROVO UT
2010-09-08 385-743-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F MURRAY UT
2010-08-19 385-234-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2010-08-19 385-234-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2010-08-04 385-208-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
2010-07-20 385-234-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-06-15 385-208-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-05-26 385-351-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F MIDVALE UT
2010-05-26 385-351-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F MIDVALE UT
2010-05-26 385-351-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F MIDVALE UT
2010-04-26 385-204-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PROVO UT
2010-04-26 385-234-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2010-04-23 385-208-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-03-29 385-351-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
2010-03-29 385-351-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
2010-02-26 385-234-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2010-02-08 385-204-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-204-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-204-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-02-08 385-221-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2010-01-21 385-351-0XXX 0000–0999Assigned FIRSTDIGITAL COMMUNICATIONS, LLC 716D MIDVALE UT
2010-01-21 385-743-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F MURRAY UT
2010-01-21 385-743-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F MURRAY UT
2010-01-20 385-204-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PROVO UT
2010-01-20 385-204-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PROVO UT
2010-01-20 385-204-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PROVO UT
2010-01-20 385-204-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - UT 117F PROVO UT
2009-12-07 385-351-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MIDVALE UT
2009-12-07 385-351-7XXX 7000–7999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 MIDVALE UT

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.