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
2021-06-02 520-552-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2021-06-02 520-552-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2021-05-19 520-472-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-05-19 520-472-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-05-19 520-472-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-05-15 520-478-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 AJO AZ
2021-05-14 520-453-0XXX 0000–0999Assigned COMMIO, LLC 939H TOMBSTONE AZ
2021-05-14 520-506-0XXX 0000–0999Assigned COMMIO, LLC 939H TOMBSTONE AZ
2021-05-14 520-506-8XXX 8000–8999Assigned COMMIO, LLC 939H TOMBSTONE AZ
2021-05-14 520-506-9XXX 9000–9999Assigned COMMIO, LLC 939H TOMBSTONE AZ
2021-05-14 520-543-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-13 520-934-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-05-08 520-504-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2021-05-08 520-504-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2021-05-08 520-504-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2021-05-08 520-504-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2021-05-07 520-476-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2021-04-30 520-521-7XXX 7000–7999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SAN MANUEL AZ
2021-04-30 520-536-8XXX 8000–8999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F DOUGLAS AZ
2021-04-22 520-537-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H TUCSON AZ
2021-04-22 520-537-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H TUCSON AZ
2021-04-22 520-537-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H TUCSON AZ
2021-04-21 520-504-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SIERRAVIST AZ
2021-04-21 520-537-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2021-04-13 520-517-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SACATON AZ
2021-04-07 520-934-6XXX 6000–6999Assigned TON80 COMMUNICATIONS, LLC 516J TUCSON AZ
2021-04-05 520-504-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2021-04-05 520-504-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2021-04-05 520-637-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-04-05 520-637-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-04-05 520-637-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-04-05 520-637-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2021-04-01 520-537-5XXX 5000–5999Assigned HD CARRIER LLC 321J TUCSON AZ
2021-04-01 520-537-6XXX 6000–6999Assigned HD CARRIER LLC 321J TUCSON AZ
2021-04-01 520-537-7XXX 7000–7999Assigned HD CARRIER LLC 321J TUCSON AZ
2021-04-01 520-537-8XXX 8000–8999Assigned HD CARRIER LLC 321J TUCSON AZ
2021-04-01 520-537-9XXX 9000–9999Assigned HD CARRIER LLC 321J TUCSON AZ
2021-03-24 520-637-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2021-03-22 520-479-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-22 520-910-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-22 520-910-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2021-03-22 520-910-3XXX 3000–3999Assigned 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.