NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

18 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 661
ONVOY, LLC - CA 10
TELEPORT COMMUNICATIONS AMERICA, LLC - CA 3
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 3
PEERLESS NETWORK OF CALIFORNIA, LLC - CA 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
2020-07-28 661-503-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2020-07-28 661-503-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2020-07-28 661-503-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2020-07-28 661-503-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2020-07-24 661-292-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 SHAFTER CA
2020-07-24 661-502-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2020-07-24 661-502-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2020-07-24 661-561-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 DELANO CA
2020-07-24 661-561-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 DELANO CA
2020-07-24 661-606-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2020-07-24 661-749-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MOJAVE CA
2020-07-24 661-770-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TAFT CA
2020-07-24 661-825-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 TEHACHAPI CA
2020-07-24 661-844-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2020-07-24 661-844-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2020-07-23 661-655-5XXX 5000–5999Assigned FRACTEL, LLC 965H ARVIN CA
2020-07-23 661-732-5XXX 5000–5999Assigned FRACTEL, LLC 965H DELANO CA
2020-07-22 661-308-3XXX 3000–3999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2020-07-22 661-308-4XXX 4000–4999Assigned METROPCS, INC. 5562 BKFD MAIN CA
2020-07-22 661-499-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2020-07-22 661-884-1XXX 1000–1999Assigned METROPCS, INC. 5562 WASCO CA
2020-07-16 661-561-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C DELANO CA
2020-07-16 661-561-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C DELANO CA
2020-07-16 661-690-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 DELANO CA
2020-07-10 661-300-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 TEHACHAPI CA
2020-07-02 661-501-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD SOUTH CA
2020-06-30 661-420-4XXX 4000–4999Assigned FRACTEL, LLC 965H CUYAMA CA
2020-06-26 661-308-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2020-06-26 661-308-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2020-06-26 661-308-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2020-06-22 661-786-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H SNCA SGCC CA
2020-06-22 661-786-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H SNCA SGCC CA
2020-06-22 661-786-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H SNCA SGCC CA
2020-06-15 661-677-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD NORTH CA
2020-06-15 661-731-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 EARLIMART CA
2020-06-10 661-754-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 MOJAVE CA
2020-06-10 661-844-2XXX 2000–2999Assigned VONAGE AMERICA LLC 197D PLDL PLDL CA
2020-06-10 661-844-3XXX 3000–3999Assigned VONAGE AMERICA LLC 197D PLDL PLDL CA
2020-06-09 661-844-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PLDL PLDL CA
2020-06-09 661-844-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 PLDL PLDL CA
2020-06-04 661-788-8XXX 8000–8999Assigned FRACTEL, LLC 965H BKFD SOUTH CA
2020-06-02 661-844-4XXX 4000–4999Assigned FRACTEL, LLC 965H PLDL PLDL CA
2020-06-01 661-502-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D SNCA NHCS CA
2020-06-01 661-502-1XXX 1000–1999Assigned VONAGE AMERICA LLC 197D SNCA NHCS CA
2020-05-28 661-854-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ARVIN CA
2020-05-28 661-999-5XXX 5000–5999Assigned FRACTEL, LLC 965H EDWARDS CA
2020-05-27 661-502-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D SNCA NHCS CA
2020-05-22 661-566-8XXX 8000–8999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2020-05-19 661-308-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BKFD MAIN CA
2020-05-19 661-499-0XXX 0000–0999Assigned AIRESPRING, INC. 996H LANCASTER CA

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.