NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

5 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 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
2012-04-24 520-365-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-04-18 520-338-0XXX 0000–0999Assigned METROPCS, INC. 5562 TUCSON AZ
2012-04-18 520-338-1XXX 1000–1999Assigned METROPCS, INC. 5562 TUCSON AZ
2012-04-18 520-338-3XXX 3000–3999Assigned METROPCS, INC. 5562 TUCSON AZ
2012-04-18 520-338-4XXX 4000–4999Assigned METROPCS, INC. 5562 TUCSON AZ
2012-04-18 520-338-5XXX 5000–5999Assigned METROPCS, INC. 5562 TUCSON AZ
2012-04-06 520-610-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SACATON AZ
2012-04-05 520-381-1XXX 1000–1999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-381-4XXX 4000–4999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-381-5XXX 5000–5999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-381-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-518-3XXX 3000–3999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-518-4XXX 4000–4999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-518-6XXX 6000–6999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-518-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-518-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-518-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2012-04-05 520-789-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2012-03-22 520-230-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-03-22 520-789-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-03-22 520-789-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-03-22 520-789-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-03-22 520-789-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-03-22 520-789-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-03-22 520-789-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-03-21 520-255-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIERRAVIST AZ
2012-03-19 520-391-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F SUPERIOR AZ
2012-03-16 520-224-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 SIERRAVIST AZ
2012-03-07 520-415-1XXX 1000–1999Assigned MCC TELEPHONY LLC 593K NOGALES AZ
2012-03-06 520-230-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-29 520-230-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-29 520-230-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-29 520-230-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-28 520-789-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-02-28 520-789-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-02-21 520-230-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-02-21 520-369-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-02-15 520-222-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-15 520-222-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-15 520-222-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-15 520-222-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-15 520-333-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-15 520-369-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-15 520-369-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-15 520-369-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2012-02-07 520-369-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-02-07 520-369-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-02-07 520-704-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-02-07 520-704-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2012-02-07 520-704-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ

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.