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
2018-04-19 520-231-0XXX 0000–0999Assigned TELNYX LLC 073H WHITLOW AZ
2018-04-19 520-317-9XXX 9000–9999Assigned TELNYX LLC 073H HAYDEN AZ
2018-04-19 520-348-8XXX 8000–8999Assigned TELNYX LLC 073H WILLCOX AZ
2018-04-19 520-402-0XXX 0000–0999Assigned TELNYX LLC 073H BENSON AZ
2018-04-19 520-422-1XXX 1000–1999Assigned TELNYX LLC 073H BISBEE AZ
2018-04-19 520-636-1XXX 1000–1999Assigned TELNYX LLC 073H SAN MANUEL AZ
2018-04-19 520-645-4XXX 4000–4999Assigned TELNYX LLC 073H DOUGLAS AZ
2018-04-18 520-231-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F WHITLOW AZ
2018-03-15 520-367-1XXX 1000–1999Assigned NUSO, LLC 551G TUCSON AZ
2018-03-05 520-367-9XXX 9000–9999Assigned METROPCS, INC. 5562 TUCSON AZ
2017-12-21 520-685-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2017-12-21 520-685-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2017-12-21 520-771-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D TUCSON AZ
2017-12-04 520-860-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2017-12-04 520-860-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2017-12-04 520-987-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2017-11-29 520-233-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CASAGRANDE AZ
2017-11-09 520-274-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2017-11-09 520-354-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2017-11-09 520-526-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2017-11-09 520-526-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2017-11-09 520-526-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2017-11-09 520-849-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2017-11-09 520-849-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2017-10-23 520-604-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2017-10-23 520-860-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 NOGALES AZ
2017-10-19 520-666-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2017-10-19 520-666-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2017-10-19 520-666-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2017-10-19 520-666-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2017-10-16 520-354-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 TUCSON AZ
2017-10-11 520-600-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2017-10-11 520-600-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2017-10-06 520-666-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F CASAGRANDE AZ
2017-09-27 520-402-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BENSON AZ
2017-09-27 520-635-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CASAGRANDE AZ
2017-09-27 520-685-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J SIERRAVIST AZ
2017-09-21 520-526-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - AZ 7465 TUCSON AZ
2017-09-18 520-340-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2017-09-18 520-340-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2017-09-18 520-526-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2017-09-13 520-666-0XXX 0000–0999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2017-09-13 520-666-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2017-09-13 520-666-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E CASAGRANDE AZ
2017-09-13 520-685-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SIERRAVIST AZ
2017-09-11 520-274-5XXX 5000–5999Assigned METROPCS, INC. 5562 TUCSON AZ
2017-09-11 520-274-6XXX 6000–6999Assigned METROPCS, INC. 5562 TUCSON AZ
2017-09-11 520-354-1XXX 1000–1999Assigned METROPCS, INC. 5562 TUCSON AZ
2017-09-11 520-354-3XXX 3000–3999Assigned METROPCS, INC. 5562 TUCSON AZ
2017-09-11 520-685-0XXX 0000–0999Assigned METROPCS, INC. 5562 SIERRAVIST 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.