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
2020-10-19 520-523-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2020-10-08 520-496-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2020-10-08 520-497-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-10-08 520-497-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-10-08 520-497-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-10-08 520-497-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-10-08 520-497-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-10-08 520-497-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-10-08 520-497-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-10-07 520-492-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2020-10-07 520-492-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2020-10-05 520-472-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H CASAGRANDE AZ
2020-10-05 520-530-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2020-10-05 520-530-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2020-10-05 520-530-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2020-10-05 520-530-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2020-10-05 520-530-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2020-10-05 520-530-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E TUCSON AZ
2020-10-02 520-476-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2020-09-28 520-588-8XXX 8000–8999Assigned FRACTEL, LLC 965H CASCABEL AZ
2020-09-28 520-644-4XXX 4000–4999Assigned FRACTEL, LLC 965H KOMATKE AZ
2020-09-28 520-755-5XXX 5000–5999Assigned FRACTEL, LLC 965H LONE BUTTE AZ
2020-09-28 520-899-9XXX 9000–9999Assigned FRACTEL, LLC 965H MARCOPAVLG AZ
2020-09-24 520-476-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-09-24 520-476-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-09-24 520-476-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-09-24 520-476-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-09-24 520-476-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2020-09-24 520-839-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2020-09-17 520-486-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-17 520-486-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2020-09-16 520-476-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2020-09-14 520-619-6XXX 6000–6999Assigned MCC TELEPHONY LLC 593K NOGALES AZ
2020-09-11 520-502-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E SASABE AZ
2020-09-11 520-523-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2020-09-11 520-523-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2020-09-11 520-655-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E SUPERIOR AZ
2020-09-11 520-779-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E WILLCOX AZ
2020-09-11 520-779-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E WILLCOX AZ
2020-09-10 520-380-1XXX 1000–1999Assigned TELNYX LLC 073H CASAGRANDE AZ
2020-09-10 520-476-0XXX 0000–0999Assigned TELNYX LLC 073H TUCSON AZ
2020-09-04 520-476-1XXX 1000–1999Assigned NUSO, LLC 478J 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.