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
2020-01-29 385-342-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J MIDVALE UT
2020-01-23 385-306-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 KAYSVILLE UT
2020-01-23 385-306-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 KAYSVILLE UT
2020-01-22 385-316-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 FARMINGTON UT
2020-01-16 385-386-9XXX 9000–9999Assigned HD CARRIER LLC 321J SALT LAKE UT
2020-01-15 385-442-8XXX 8000–8999Assigned FIRSTDIGITAL COMMUNICATIONS, LLC 716D CLEARFIELD UT
2020-01-10 385-318-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MURRAY UT
2020-01-10 385-343-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2020-01-10 385-343-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2020-01-10 385-343-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2020-01-10 385-343-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2020-01-09 385-442-1XXX 1000–1999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CLEARFIELD UT
2020-01-07 385-326-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 OGDEN UT
2020-01-07 385-326-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 OGDEN UT
2020-01-07 385-349-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2020-01-07 385-349-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2020-01-06 385-398-8XXX 8000–8999Assigned TELNYX LLC 073H SPRINGVL UT
2019-12-26 385-317-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MORGAN UT
2019-12-26 385-317-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MORGAN UT
2019-12-20 385-310-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 KAYSVILLE UT
2019-12-19 385-343-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E SALT LAKE UT
2019-12-19 385-343-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E SALT LAKE UT
2019-12-17 385-306-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - UT 3231 KAYSVILLE UT
2019-12-16 385-283-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PROVO UT
2019-12-12 385-349-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2019-12-12 385-349-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 PROVO UT
2019-12-12 385-442-0XXX 0000–0999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 CLEARFIELD UT
2019-12-03 385-316-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FARMINGTON UT
2019-11-26 385-342-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - UT 7530 MIDVALE UT
2019-11-05 385-326-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 OGDEN UT
2019-11-05 385-342-6XXX 6000–6999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MIDVALE UT
2019-11-05 385-342-7XXX 7000–7999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J MIDVALE UT
2019-11-05 385-432-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 OGDEN UT
2019-11-05 385-432-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 OGDEN UT
2019-10-24 385-287-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LEHI UT
2019-10-22 385-342-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E MIDVALE UT
2019-10-22 385-342-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E MIDVALE UT
2019-10-22 385-342-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E MIDVALE UT
2019-10-22 385-348-4XXX 4000–4999Assigned ONVOY, LLC - UT 871E KAYSVILLE UT
2019-10-22 385-348-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E KAYSVILLE UT
2019-10-21 385-343-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2019-10-21 385-343-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2019-10-21 385-343-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SALT LAKE UT
2019-10-17 385-306-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 KAYSVILLE UT
2019-10-17 385-306-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 KAYSVILLE UT
2019-10-17 385-306-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 KAYSVILLE UT
2019-10-08 385-284-0XXX 0000–0999Assigned ONVOY, LLC - UT 871E MORGAN UT
2019-10-08 385-284-7XXX 7000–7999Assigned ONVOY, LLC - UT 871E MORGAN UT
2019-10-08 385-293-3XXX 3000–3999Assigned ONVOY, LLC - UT 871E AMERCNFORK UT
2019-10-08 385-324-5XXX 5000–5999Assigned ONVOY, LLC - UT 871E BOUNTIFUL 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.