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
2012-02-16 423-271-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 SWEETWATER TN
2012-02-14 423-480-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 KINGSPORT TN
2012-02-09 423-401-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J SODDYDAISY TN
2012-02-06 423-490-7XXX 7000–7999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHATTNOOGA TN
2012-02-06 423-490-9XXX 9000–9999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHATTNOOGA TN
2012-01-30 423-356-5XXX 5000–5999Assigned METROPCS, INC. 5562 CHATTNOOGA TN
2012-01-30 423-356-6XXX 6000–6999Assigned METROPCS, INC. 5562 CHATTNOOGA TN
2012-01-30 423-356-7XXX 7000–7999Assigned METROPCS, INC. 5562 CHATTNOOGA TN
2012-01-30 423-356-8XXX 8000–8999Assigned METROPCS, INC. 5562 CHATTNOOGA TN
2012-01-30 423-356-9XXX 9000–9999Assigned POWERTEL ATLANTA LICENSES, INC. 7473 CHATTNOOGA TN
2012-01-30 423-829-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 CHARLESTON TN
2012-01-23 423-321-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHATTNOOGA TN
2012-01-23 423-742-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F BRISTOL TN
2011-12-28 423-528-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F BAILEYTON TN
2011-12-08 423-512-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - TN 124F STONEY CRK TN
2011-12-07 423-702-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 CHATTNOOGA TN
2011-11-29 423-301-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 7278 SO PITTSBG TN
2011-11-22 423-735-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 7278 ERWIN TN
2011-11-11 423-241-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 COPPERBSIN TN
2011-11-11 423-271-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 SWEETWATER TN
2011-11-10 423-444-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 LIMESTONE TN
2011-11-04 423-377-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 LAFOLLETTE TN
2011-11-04 423-492-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 MORRISTOWN TN
2011-11-04 423-710-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 CHATTNOOGA TN
2011-11-02 423-281-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BUTLER TN
2011-11-02 423-405-2XXX 2000–2999Assigned POWERTEL NASHVILLE LICENSES, INC. 7476 ATHENS TN
2011-10-27 423-328-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 JOHNSON CY TN
2011-10-27 423-529-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 GEORGETOWN TN
2011-10-27 423-800-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2011-10-27 423-800-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2011-10-27 423-800-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2011-10-27 423-800-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC - GA 6214 CHATTNOOGA TN
2011-10-26 423-882-0XXX 0000–0999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-1XXX 1000–1999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-2XXX 2000–2999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-3XXX 3000–3999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-4XXX 4000–4999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-5XXX 5000–5999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-6XXX 6000–6999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-7XXX 7000–7999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-8XXX 8000–8999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-26 423-882-9XXX 9000–9999Assigned BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 CHATTNOOGA TN
2011-10-21 423-347-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ROGERSVL TN
2011-10-21 423-445-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SURGOINSVL TN
2011-10-21 423-973-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C SNEEDVILLE TN
2011-10-20 423-358-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 ROGERSVL TN
2011-10-20 423-393-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C BULLS GAP TN
2011-10-20 423-781-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C ETOWAH TN
2011-10-19 423-825-4XXX 4000–4999Assigned ELECTRIC POWER BOARD OF CHATTANOOGA 4645 CHATTNOOGA TN
2011-10-13 423-758-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - TN 4806 BRISTOL 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.