NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

16 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
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
2016-11-10 661-271-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E MOJAVE CA
2016-11-10 661-279-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ROSAMOND CA
2016-11-08 661-271-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MOJAVE CA
2016-11-03 661-543-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MCFARLAND CA
2016-11-03 661-615-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BKFD NORTH CA
2016-11-03 661-759-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F WASCO CA
2016-11-01 661-527-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BKFD SOUTH CA
2016-10-27 661-542-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F SNCA SGCC CA
2016-10-25 661-488-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C LANCASTER CA
2016-10-25 661-754-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C MOJAVE CA
2016-10-25 661-821-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C TEHACHAPI CA
2016-10-21 661-227-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-10-21 661-227-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-10-21 661-227-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-10-21 661-227-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-10-21 661-227-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-10-14 661-567-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-10-14 661-567-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-10-14 661-567-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-10-14 661-573-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-10-14 661-573-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-10-13 661-292-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SHAFTER CA
2016-10-11 661-227-0XXX 0000–0999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2016-10-11 661-227-9XXX 9000–9999Assigned METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2016-10-11 661-584-9XXX 9000–9999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MOJAVE CA
2016-09-30 661-534-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 DELANO CA
2016-09-26 661-386-0XXX 0000–0999Assigned CHARTER IP ENABLED SERVICES, LLC 792K ROSAMOND CA
2016-09-21 661-532-4XXX 4000–4999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BIG BUTTE CA
2016-09-20 661-567-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-09-20 661-567-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-09-20 661-567-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-09-20 661-567-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-09-20 661-575-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-09-20 661-585-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-09-15 661-582-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2016-08-29 661-416-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2016-08-29 661-416-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2016-08-29 661-416-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2016-08-25 661-306-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E LAKEHUGHES CA
2016-08-25 661-532-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BIG BUTTE CA
2016-08-24 661-365-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-08-24 661-365-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-08-24 661-585-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-08-24 661-585-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-08-24 661-585-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-08-24 661-779-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ARVIN CA
2016-08-18 661-491-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2016-08-18 661-491-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2016-08-18 661-491-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2016-08-17 661-582-8XXX 8000–8999Assigned TWC IP ENABLED SERVICES, LLC 793K 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.