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
2018-05-10 423-806-2XXX 2000–2999Assigned ONVOY, LLC - TN 525E MIDWAY TN
2018-05-10 423-896-5XXX 5000–5999Assigned ONVOY, LLC - TN 525E HAMPTON TN
2018-05-10 423-897-2XXX 2000–2999Assigned ONVOY, LLC - TN 525E FALLBRANCH TN
2018-05-09 423-446-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F FALLBRANCH TN
2018-04-30 423-397-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F BENTON TN
2018-04-30 423-712-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F BLUFF CITY TN
2018-04-30 423-712-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F BLUFF CITY TN
2018-04-17 423-281-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F BUTLER TN
2018-04-16 423-910-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 OOLTEWAH TN
2018-04-03 423-251-2XXX 2000–2999Assigned METROPCS, INC. 5562 KINGSPORT TN
2018-03-26 423-549-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D JOHNSON CY TN
2018-03-21 423-541-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D CHATTNOOGA TN
2018-03-20 423-259-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F NEWTAZWELL TN
2018-03-20 423-806-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 7278 MIDWAY TN
2018-03-13 423-497-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 CHATTNOOGA TN
2018-03-06 423-427-4XXX 4000–4999Assigned ONVOY, LLC - TN 525E JOHNSON CY TN
2018-03-05 423-520-4XXX 4000–4999Assigned ONVOY, LLC - TN 525E MADISONVL TN
2018-03-05 423-814-1XXX 1000–1999Assigned ONVOY, LLC - TN 525E SWEETWATER TN
2018-03-01 423-205-5XXX 5000–5999Assigned ONVOY, LLC - TN 525E ETOWAH TN
2018-03-01 423-445-7XXX 7000–7999Assigned ONVOY, LLC - TN 525E SURGOINSVL TN
2018-03-01 423-537-4XXX 4000–4999Assigned ONVOY, LLC - TN 525E BULLS GAP TN
2018-03-01 423-540-1XXX 1000–1999Assigned ONVOY, LLC - TN 525E NEWPORT TN
2018-03-01 423-818-1XXX 1000–1999Assigned ONVOY, LLC - TN 525E JELLICO TN
2018-02-26 423-451-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SODDYDAISY TN
2018-02-16 423-482-3XXX 3000–3999Assigned METROPCS, INC. 5562 BLOUNTVL TN
2018-02-16 423-540-0XXX 0000–0999Assigned ONVOY, LLC - TN 525E NEWPORT TN
2018-02-13 423-621-4XXX 4000–4999Assigned ONVOY, LLC - TN 525E MORRISTOWN TN
2018-02-07 423-524-1XXX 1000–1999Assigned NUSO, LLC 551G JOHNSON CY TN
2018-02-07 423-921-5XXX 5000–5999Assigned ONVOY, LLC - TN 525E ROGERSVL TN
2018-02-06 423-397-2XXX 2000–2999Assigned ONVOY, LLC - TN 525E BENTON TN
2018-02-06 423-403-3XXX 3000–3999Assigned ONVOY, LLC - TN 525E SO PITTSBG TN
2018-02-05 423-451-8XXX 8000–8999Assigned ONVOY, LLC - TN 525E SODDYDAISY TN
2018-01-17 423-459-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F CHATTNOOGA TN
2018-01-17 423-459-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F CHATTNOOGA TN
2018-01-17 423-459-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F CHATTNOOGA TN
2018-01-17 423-459-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F CHATTNOOGA TN
2018-01-17 423-459-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F CHATTNOOGA TN
2018-01-17 423-459-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F CHATTNOOGA TN
2018-01-17 423-459-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F CHATTNOOGA TN
2018-01-11 423-651-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F JASPER TN
2018-01-11 423-651-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F JASPER TN
2018-01-09 423-732-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F KINGSPORT TN
2017-12-21 423-380-0XXX 0000–0999Assigned ONVOY, LLC - TN 525E CLEVELAND TN
2017-12-21 423-380-1XXX 1000–1999Assigned ONVOY, LLC - TN 525E CLEVELAND TN
2017-12-15 423-270-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ERWIN TN
2017-11-29 423-269-6XXX 6000–6999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHATTNOOGA TN
2017-11-29 423-269-7XXX 7000–7999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHATTNOOGA TN
2017-11-29 423-269-8XXX 8000–8999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHATTNOOGA TN
2017-11-20 423-251-0XXX 0000–0999Assigned METROPCS, INC. 5562 KINGSPORT TN
2017-11-17 423-500-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 ROGERSVL 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.