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
2019-11-13 520-416-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - AZ 7217 TUCSON AZ
2019-11-11 520-346-4XXX 4000–4999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2019-11-11 520-346-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E BISBEE AZ
2019-11-11 520-375-2XXX 2000–2999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2019-11-11 520-375-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2019-11-11 520-376-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2019-11-11 520-376-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2019-11-11 520-379-5XXX 5000–5999Assigned ONVOY, LLC - AZ 630E DOUGLAS AZ
2019-11-11 520-402-1XXX 1000–1999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2019-11-11 520-402-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E BENSON AZ
2019-11-11 520-412-3XXX 3000–3999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ
2019-11-11 520-412-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E TOMBSTONE AZ
2019-11-07 520-416-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2019-11-07 520-416-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2019-10-29 520-372-1XXX 1000–1999Assigned INTRADO COMMUNICATIONS, LLC 890G TUCSON AZ
2019-10-29 520-372-9XXX 9000–9999Assigned INTRADO COMMUNICATIONS, LLC 890G TUCSON AZ
2019-10-29 520-416-0XXX 0000–0999Assigned INTRADO COMMUNICATIONS, LLC 890G TUCSON AZ
2019-10-29 520-416-8XXX 8000–8999Assigned INTRADO COMMUNICATIONS, LLC 890G TUCSON AZ
2019-10-29 520-416-9XXX 9000–9999Assigned INTRADO COMMUNICATIONS, LLC 890G TUCSON AZ
2019-10-17 520-438-0XXX 0000–0999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F WHITLOW AZ
2019-10-04 520-436-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2019-10-04 520-436-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E HAYDEN AZ
2019-10-04 520-438-7XXX 7000–7999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2019-10-04 520-438-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E WHITLOW AZ
2019-09-26 520-376-8XXX 8000–8999Assigned ONVOY, LLC - AZ 630E SIERRAVIST AZ
2019-09-26 520-470-6XXX 6000–6999Assigned ONVOY, LLC - AZ 630E NOGALES AZ
2019-09-25 520-372-0XXX 0000–0999Assigned INTRADO COMMUNICATIONS, LLC 890G TUCSON AZ
2019-09-23 520-341-2XXX 2000–2999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F NOGALES AZ
2019-09-16 520-416-1XXX 1000–1999Assigned EXIANT COMMUNICATIONS LLC 114J TUCSON AZ
2019-08-27 520-472-2XXX 2000–2999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2019-08-27 520-472-3XXX 3000–3999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2019-08-23 520-380-9XXX 9000–9999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2019-08-06 520-372-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2019-08-06 520-372-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2019-08-06 520-372-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2019-08-06 520-610-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SACATON AZ
2019-07-31 520-363-1XXX 1000–1999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F HAYDEN AZ
2019-07-31 520-376-0XXX 0000–0999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F SIERRAVIST AZ
2019-07-31 520-412-2XXX 2000–2999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F TOMBSTONE AZ
2019-07-31 520-759-1XXX 1000–1999Assigned PEERLESS NETWORK OF ARIZONA, LLC - AZ 579F CASAGRANDE AZ
2019-07-25 520-600-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2019-06-26 520-493-1XXX 1000–1999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 TUCSON AZ
2019-06-26 520-493-2XXX 2000–2999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 TUCSON AZ
2019-06-26 520-493-3XXX 3000–3999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 TUCSON AZ
2019-06-26 520-493-4XXX 4000–4999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 TUCSON AZ
2019-06-26 520-493-5XXX 5000–5999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 TUCSON AZ
2019-06-26 520-493-6XXX 6000–6999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 TUCSON AZ
2019-06-26 520-493-7XXX 7000–7999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 TUCSON AZ
2019-06-26 520-493-8XXX 8000–8999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 TUCSON AZ
2019-06-26 520-493-9XXX 9000–9999Assigned FIRSTDIGITAL TELECOM, LLC - UT 5727 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.