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
2019-01-07 520-759-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J CASAGRANDE AZ
2019-01-07 520-759-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CASAGRANDE AZ
2018-12-13 520-771-7XXX 7000–7999Assigned METROPCS, INC. 5562 TUCSON AZ
2018-12-11 520-597-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 SUPERIOR AZ
2018-12-10 520-849-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-12-10 520-849-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-12-10 520-849-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-12-10 520-849-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-11-23 520-341-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2018-11-14 520-346-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 BISBEE AZ
2018-11-02 520-759-2XXX 2000–2999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2018-11-02 520-759-3XXX 3000–3999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2018-10-30 520-412-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TOMBSTONE AZ
2018-10-02 520-341-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F NOGALES AZ
2018-10-02 520-597-3XXX 3000–3999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SUPERIOR AZ
2018-10-02 520-849-9XXX 9000–9999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TUCSON AZ
2018-09-28 520-600-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2018-09-28 520-771-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2018-09-28 520-771-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2018-09-26 520-600-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-09-24 520-346-3XXX 3000–3999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F BISBEE AZ
2018-09-17 520-779-1XXX 1000–1999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WILLCOX AZ
2018-09-12 520-779-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WILLCOX AZ
2018-09-11 520-600-9XXX 9000–9999Assigned METROPCS, INC. 5562 TUCSON AZ
2018-09-10 520-759-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2018-09-05 520-231-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WHITLOW AZ
2018-08-23 520-600-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-07-18 520-771-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-07-10 520-993-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SELLS AZ
2018-06-28 520-600-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-06-28 520-600-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-06-15 520-340-3XXX 3000–3999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2018-06-12 520-771-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-06-12 520-771-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-06-12 520-771-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-06-08 520-231-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WHITLOW AZ
2018-05-30 520-341-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2018-05-29 520-367-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2018-05-29 520-367-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2018-05-10 520-348-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WILLCOX AZ
2018-05-04 520-367-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-05-04 520-367-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-05-04 520-367-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2018-05-02 520-330-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-05-02 520-354-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-05-02 520-354-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-05-02 520-367-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-05-02 520-367-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2018-05-02 520-402-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 BENSON AZ
2018-05-01 520-340-2XXX 2000–2999Assigned METROPCS, INC. 5562 CASAGRANDE 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.