NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

5 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2006-11-01 520-396-6XXX 6000–6999Assigned QWEST CORPORATION 9636 TUCSON AZ
2006-11-01 520-396-7XXX 7000–7999Assigned QWEST CORPORATION 9636 TUCSON AZ
2006-10-30 520-371-3XXX 3000–3999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2006-10-30 520-371-4XXX 4000–4999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2006-10-27 520-396-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-10-27 520-396-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-10-23 520-233-2XXX 2000–2999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2006-10-16 520-396-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2006-10-16 520-396-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2006-10-16 520-647-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2006-10-16 520-647-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2006-10-09 520-233-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CASAGRANDE AZ
2006-09-28 520-576-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-09-19 520-289-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-09-19 520-483-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2006-09-19 520-664-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-09-19 520-784-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-09-15 520-628-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-09-07 520-289-8XXX 8000–8999Assigned LEVEL 3 TELECOM OF ARIZONA, LLC - AZ 7552 TUCSON AZ
2006-09-06 520-285-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2006-08-30 520-289-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-08-30 520-289-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-08-30 520-289-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-08-30 520-289-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-08-30 520-289-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-08-29 520-254-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 WILLCOX AZ
2006-08-29 520-289-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-08-29 520-449-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-08-29 520-449-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2006-08-29 520-732-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2006-08-28 520-394-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 NOGALES AZ
2006-08-28 520-396-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-08-23 520-449-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2006-08-22 520-449-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-08-22 520-901-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-08-18 520-483-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 CASAGRANDE AZ
2006-08-17 520-509-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2006-08-15 520-827-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SUPERIOR AZ
2006-08-07 520-399-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2006-08-07 520-834-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2006-08-01 520-413-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2006-08-01 520-413-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 CASAGRANDE AZ
2006-07-21 520-463-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 WHITLOW AZ
2006-07-18 520-233-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2006-07-12 520-285-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 NOGALES AZ
2006-07-11 520-494-2XXX 2000–2999Assigned QWEST CORPORATION 9636 CASAGRANDE AZ
2006-07-10 520-309-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2006-07-07 520-908-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J TUCSON AZ
2006-07-07 520-908-7XXX 7000–7999Assigned PAETEC ITEL, LLC 829J TUCSON AZ
2006-06-29 520-289-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.