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
2018-03-26 661-479-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2018-03-26 661-479-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2018-03-14 661-741-0XXX 0000–0999Assigned VONAGE AMERICA LLC 197D BKFD MAIN CA
2018-03-07 661-885-6XXX 6000–6999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD SOUTH CA
2018-02-12 661-534-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F DELANO CA
2018-02-12 661-749-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F MOJAVE CA
2018-02-09 661-289-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LEBEC CA
2018-02-06 661-479-5XXX 5000–5999Assigned BHN IP ENABLED SERVICES, LLC 045L BKFD MAIN CA
2018-01-02 661-759-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WASCO CA
2017-12-28 661-528-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 ROSAMOND CA
2017-12-22 661-417-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C SNCA NHCS CA
2017-12-19 661-218-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C BKFD NORTH CA
2017-12-19 661-218-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C BKFD NORTH CA
2017-12-08 661-357-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEHACHAPI CA
2017-12-08 661-357-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEHACHAPI CA
2017-12-08 661-357-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEHACHAPI CA
2017-12-08 661-357-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEHACHAPI CA
2017-12-08 661-357-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEHACHAPI CA
2017-12-08 661-357-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEHACHAPI CA
2017-12-08 661-357-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEHACHAPI CA
2017-12-08 661-359-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 DELANO CA
2017-12-08 661-405-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2017-12-08 661-454-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C DELANO CA
2017-12-08 661-759-5XXX 5000–5999Assigned BHN IP ENABLED SERVICES, LLC 045L WASCO CA
2017-12-06 661-353-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LANCASTER CA
2017-12-06 661-353-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LANCASTER CA
2017-12-04 661-355-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ROSAMOND CA
2017-12-04 661-355-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ROSAMOND CA
2017-12-04 661-355-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ROSAMOND CA
2017-12-04 661-355-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ROSAMOND CA
2017-12-04 661-355-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ROSAMOND CA
2017-12-04 661-355-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 ROSAMOND CA
2017-12-01 661-207-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNCA NHCS CA
2017-12-01 661-207-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNCA NHCS CA
2017-12-01 661-207-8XXX 8000–8999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 SNCA NHCS CA
2017-12-01 661-417-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 SNCA NHCS CA
2017-12-01 661-771-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 TEHACHAPI CA
2017-11-30 661-351-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LAKEHUGHES CA
2017-11-30 661-351-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 LAKEHUGHES CA
2017-11-29 661-354-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BKFD MAIN CA
2017-11-29 661-354-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BKFD MAIN CA
2017-11-29 661-354-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BKFD MAIN CA
2017-11-29 661-354-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BKFD MAIN CA
2017-11-29 661-354-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BKFD MAIN CA
2017-11-29 661-354-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BKFD MAIN CA
2017-11-29 661-354-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 BKFD MAIN CA
2017-11-29 661-356-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MOJAVE CA
2017-11-29 661-356-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MOJAVE CA
2017-11-29 661-356-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MOJAVE CA
2017-11-29 661-356-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 MOJAVE 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.