NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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 520
NEW CINGULAR WIRELESS PCS, LLC 3
INTRADO COMMUNICATIONS, LLC 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
2015-01-16 520-809-2XXX 2000–2999Assigned METROPCS, INC. 5562 TUCSON AZ
2015-01-16 520-809-3XXX 3000–3999Assigned METROPCS, INC. 5562 TUCSON AZ
2015-01-16 520-809-4XXX 4000–4999Assigned METROPCS, INC. 5562 TUCSON AZ
2015-01-16 520-809-5XXX 5000–5999Assigned METROPCS, INC. 5562 TUCSON AZ
2014-12-30 520-254-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 WILLCOX AZ
2014-12-30 520-993-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SELLS AZ
2014-12-29 520-788-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2014-12-29 520-788-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2014-12-29 520-809-9XXX 9000–9999Assigned INTRADO COMMUNICATIONS, LLC 890G TUCSON AZ
2014-12-19 520-391-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUPERIOR AZ
2014-12-16 520-599-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-16 520-599-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-12-15 520-385-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F SAN MANUEL AZ
2014-12-15 520-487-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F SAN MANUEL AZ
2014-12-11 520-200-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F HAYDEN AZ
2014-12-11 520-337-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WILLCOX AZ
2014-12-11 520-363-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F HAYDEN AZ
2014-11-18 520-213-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2014-11-05 520-788-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J CASAGRANDE AZ
2014-11-04 520-276-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-11-04 520-276-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-10-29 520-442-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F BENSON AZ
2014-10-27 520-729-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2014-10-24 520-201-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F SAN MANUEL AZ
2014-10-24 520-385-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F SAN MANUEL AZ
2014-10-24 520-389-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-10-24 520-389-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-10-24 520-389-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-10-24 520-389-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-10-24 520-389-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-10-24 520-389-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-10-24 520-729-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2014-10-22 520-389-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2014-10-22 520-860-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F NOGALES AZ

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.