NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

13 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 423
NEW CINGULAR WIRELESS PCS, LLC - GA 3
BANDWIDTH.COM CLEC, LLC - TN 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 2
AHOI LLC 2
TELNYX LLC 1
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
2020-03-31 423-640-9XXX 9000–9999Assigned AT&T - LOCAL 7421 SNEEDVILLE TN
2020-03-26 423-419-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F CUMBERLDGP TN
2020-03-09 423-644-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SODDYDAISY TN
2020-03-09 423-644-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SODDYDAISY TN
2020-03-09 423-732-4XXX 4000–4999Assigned METROPCS, INC. 5562 KINGSPORT TN
2020-03-05 423-900-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2020-03-05 423-900-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2020-03-05 423-900-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2020-03-05 423-900-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2020-03-05 423-952-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2020-03-04 423-560-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 ERWIN TN
2020-02-27 423-401-6XXX 6000–6999Assigned ONVOY, LLC - TN 525E SODDYDAISY TN
2020-02-27 423-556-6XXX 6000–6999Assigned ONVOY, LLC - TN 525E SODDYDAISY TN
2020-02-27 423-556-7XXX 7000–7999Assigned ONVOY, LLC - TN 525E SODDYDAISY TN
2020-02-25 423-216-2XXX 2000–2999Assigned ONVOY, LLC - TN 525E BENTON TN
2020-02-25 423-216-3XXX 3000–3999Assigned ONVOY, LLC - TN 525E BENTON TN
2020-02-06 423-206-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-206-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-558-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-558-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-558-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-558-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-558-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-933-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-933-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-02-06 423-977-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2020-01-31 423-407-8XXX 8000–8999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 SPRINGCITY TN
2020-01-28 423-515-7XXX 7000–7999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 SO PITTSBG TN
2020-01-28 423-556-5XXX 5000–5999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 SODDYDAISY TN
2020-01-25 423-565-3XXX 3000–3999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 DECATUR TN
2020-01-25 423-589-4XXX 4000–4999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 GEORGETOWN TN
2020-01-25 423-810-2XXX 2000–2999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHARLESTON TN
2020-01-25 423-939-6XXX 6000–6999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 JASPER TN
2020-01-14 423-407-1XXX 1000–1999Assigned TWIN LAKES COMMUNICATIONS, INC. - TN 204G SPRINGCITY TN
2020-01-10 423-549-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2020-01-10 423-549-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2020-01-10 423-549-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2020-01-10 423-734-3XXX 3000–3999Assigned ONVOY, LLC - TN 525E ROGERSVL TN
2020-01-10 423-734-4XXX 4000–4999Assigned ONVOY, LLC - TN 525E ROGERSVL TN
2020-01-07 423-564-1XXX 1000–1999Assigned ONVOY, LLC - TN 525E ROGERSVL TN
2020-01-06 423-373-8XXX 8000–8999Assigned TELNYX LLC 073H BULLS GAP TN
2019-12-30 423-672-1XXX 1000–1999Assigned TELNYX LLC 073H JOHNSON CY TN
2019-12-18 423-633-1XXX 1000–1999Assigned TELNYX LLC 073H CHATTNOOGA TN
2019-12-11 423-427-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2019-12-11 423-427-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 JOHNSON CY TN
2019-12-04 423-568-5XXX 5000–5999Assigned ONVOY, LLC - TN 525E NIOTA TN
2019-11-22 423-703-4XXX 4000–4999Assigned ONVOY, LLC - TN 525E COKERCREEK TN
2019-11-19 423-210-4XXX 4000–4999Assigned ONVOY, LLC - TN 525E TELLICO PL TN
2019-11-19 423-214-2XXX 2000–2999Assigned ONVOY, LLC - TN 525E ENGLEWOOD TN
2019-11-19 423-264-2XXX 2000–2999Assigned ONVOY, LLC - TN 525E VONORE TN

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.