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
2004-09-07 520-204-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2004-08-25 520-260-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-07-20 520-971-0XXX 0000–0999Assigned METROPCS, INC. 5562 TUCSON AZ
2004-07-20 520-990-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-07-20 520-991-2XXX 2000–2999Assigned METROPCS, INC. 5562 TUCSON AZ
2004-07-15 520-203-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-07-07 520-204-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2004-06-30 520-979-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-06-30 520-979-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-06-30 520-979-6XXX 6000–6999Assigned METROPCS, INC. 5562 TUCSON AZ
2004-06-29 520-203-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 TUCSON AZ
2004-06-28 520-398-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2004-06-28 520-398-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2004-06-21 520-357-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 HAYDEN AZ
2004-06-21 520-487-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SAN MANUEL AZ
2004-06-21 520-689-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 SUPERIOR AZ
2004-06-15 520-662-0XXX 0000–0999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-1XXX 1000–1999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-2XXX 2000–2999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-3XXX 3000–3999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-4XXX 4000–4999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-5XXX 5000–5999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-6XXX 6000–6999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-7XXX 7000–7999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-8XXX 8000–8999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-15 520-662-9XXX 9000–9999Assigned QWEST CORPORATION 9636 TUCSON AZ
2004-06-08 520-254-9XXX 9000–9999Assigned METROPCS, INC. 5562 WILLCOX AZ
2004-06-08 520-829-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - AZ 3285 TUCSON AZ
2004-05-28 520-252-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2004-05-28 520-252-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2004-05-28 520-252-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2004-05-28 520-252-8XXX 8000–8999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2004-05-28 520-271-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-05-28 520-370-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-05-28 520-661-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-05-28 520-820-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-05-28 520-820-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2004-04-28 520-280-2XXX 2000–2999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2004-04-28 520-280-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2004-04-28 520-280-4XXX 4000–4999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2004-04-28 520-470-7XXX 7000–7999Assigned METROPCS, INC. 5562 NOGALES AZ
2004-04-28 520-979-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-04-28 520-979-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-03-31 520-250-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 TUCSON AZ
2004-03-31 520-280-5XXX 5000–5999Assigned METROPCS, INC. 5562 CASAGRANDE AZ
2004-03-31 520-280-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 CASAGRANDE AZ
2004-03-29 520-234-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 SIERRAVIST AZ
2004-03-26 520-203-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2004-03-26 520-203-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J TUCSON AZ
2004-03-12 520-250-3XXX 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.