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
2011-06-07 423-588-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F GREENEVL TN
2011-06-07 423-707-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F ELIZABTHTN TN
2011-06-07 423-735-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F ERWIN TN
2011-06-07 423-788-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F JONESBORO TN
2011-05-31 423-414-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 CHATTNOOGA TN
2011-05-31 423-599-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 CLEVELAND TN
2011-05-25 423-475-1XXX 1000–1999Assigned POWERTEL ATLANTA LICENSES, INC. 7473 CHATTNOOGA TN
2011-05-25 423-475-2XXX 2000–2999Assigned POWERTEL ATLANTA LICENSES, INC. 7473 CHATTNOOGA TN
2011-05-25 423-475-3XXX 3000–3999Assigned POWERTEL ATLANTA LICENSES, INC. 7473 CHATTNOOGA TN
2011-05-25 423-475-4XXX 4000–4999Assigned POWERTEL ATLANTA LICENSES, INC. 7473 CHATTNOOGA TN
2011-05-25 423-948-6XXX 6000–6999Assigned SUNCOM DBA T-MOBILE USA 8645 LIMESTONE TN
2011-05-24 423-328-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F JOHNSON CY TN
2011-05-24 423-482-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - TN 114F BLOUNTVL TN
2011-05-23 423-930-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F JOHNSON CY TN
2011-05-23 423-930-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F JOHNSON CY TN
2011-05-18 423-999-1XXX 1000–1999Assigned POWERTEL NASHVILLE LICENSES, INC. 7476 ATHENS TN
2011-05-18 423-999-2XXX 2000–2999Assigned POWERTEL NASHVILLE LICENSES, INC. 7476 ATHENS TN
2011-05-06 423-631-6XXX 6000–6999Assigned SUNCOM DBA T-MOBILE USA 8645 JOHNSON CY TN
2011-05-06 423-631-7XXX 7000–7999Assigned SUNCOM DBA T-MOBILE USA 8645 JOHNSON CY TN
2011-05-06 423-631-8XXX 8000–8999Assigned SUNCOM DBA T-MOBILE USA 8645 JOHNSON CY TN
2011-05-06 423-631-9XXX 9000–9999Assigned SUNCOM DBA T-MOBILE USA 8645 JOHNSON CY TN
2011-04-28 423-228-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F SO PITTSBG TN
2011-04-28 423-631-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F JOHNSON CY TN
2011-04-28 423-631-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F JOHNSON CY TN
2011-04-28 423-771-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F CHATTNOOGA TN
2011-04-28 423-822-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F CHATTNOOGA TN
2011-04-28 423-825-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F CHATTNOOGA TN
2011-04-28 423-954-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F CHATTNOOGA TN
2011-04-09 423-492-5XXX 5000–5999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MORRISTOWN TN
2011-04-09 423-492-6XXX 6000–6999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MORRISTOWN TN
2011-04-09 423-492-7XXX 7000–7999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MORRISTOWN TN
2011-04-09 423-492-8XXX 8000–8999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MORRISTOWN TN
2011-04-09 423-492-9XXX 9000–9999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MORRISTOWN TN
2011-03-31 423-405-9XXX 9000–9999Assigned POWERTEL NASHVILLE LICENSES, INC. 7476 ATHENS TN
2011-03-31 423-999-0XXX 0000–0999Assigned POWERTEL NASHVILLE LICENSES, INC. 7476 ATHENS TN
2011-03-31 423-999-9XXX 9000–9999Assigned POWERTEL NASHVILLE LICENSES, INC. 7476 ATHENS TN
2011-03-21 423-758-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 BRISTOL TN
2011-03-18 423-353-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J MORRISTOWN TN
2011-03-15 423-347-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F ROGERSVL TN
2011-03-10 423-381-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 ATHENS TN
2011-03-10 423-408-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 KINGSPORT TN
2011-03-10 423-446-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F FALLBRANCH TN
2011-03-10 423-486-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 CHATTNOOGA TN
2011-03-10 423-567-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F DAYTON TN
2011-03-10 423-896-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F HAMPTON TN
2011-03-04 423-398-9XXX 9000–9999Assigned SUNCOM DBA T-MOBILE USA 8645 KINGSPORT TN
2011-03-03 423-371-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C SWEETWATER TN
2011-03-02 423-531-4XXX 4000–4999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHATTNOOGA TN
2011-03-02 423-531-7XXX 7000–7999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHATTNOOGA TN
2011-02-25 423-531-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CHATTNOOGA 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.