NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

4 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 510
ONVOY, LLC - CA 3
BANDWIDTH.COM CLEC, LLC - CA 1
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
2016-07-06 510-507-7XXX 7000–7999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F OKLD MN-PD CA
2016-07-05 510-203-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-07-05 510-241-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E ELSBR-PINL CA
2016-07-05 510-399-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-06-29 510-462-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2016-06-28 510-319-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2016-06-27 510-422-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD FRTVL CA
2016-06-23 510-939-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HRCUL-RODE CA
2016-06-22 510-858-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2016-06-22 510-858-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2016-06-17 510-707-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 510-707-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 510-707-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 510-707-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-17 510-707-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-06-15 510-399-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2016-06-15 510-399-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2016-06-14 510-462-4XXX 4000–4999Assigned ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7174 FRNK GRNLF CA
2016-06-14 510-890-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2016-06-10 510-422-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2016-06-10 510-963-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2016-06-10 510-993-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2016-06-10 510-993-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2016-06-09 510-806-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2016-06-09 510-806-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2016-06-09 510-806-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2016-05-19 510-631-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2016-05-16 510-937-5XXX 5000–5999Assigned HD CARRIER LLC 321J CROCKETT CA
2016-05-16 510-937-8XXX 8000–8999Assigned HD CARRIER LLC 321J CROCKETT CA
2016-05-16 510-937-9XXX 9000–9999Assigned HD CARRIER LLC 321J CROCKETT CA
2016-05-11 510-462-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C FRNK GRNLF CA
2016-05-11 510-462-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C FRNK GRNLF CA
2016-05-11 510-696-1XXX 1000–1999Assigned AT&T ENTERPRISES, LLC 516C OKLD FRTVL CA
2016-05-06 510-399-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2016-05-06 510-399-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2016-05-06 510-399-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2016-05-04 510-462-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FRNK GRNLF CA
2016-05-04 510-462-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C FRNK GRNLF CA
2016-04-26 510-707-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD TRNID CA
2016-04-05 510-345-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD BKLY CA
2016-04-05 510-369-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2016-04-05 510-369-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2016-04-01 510-707-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-04-01 510-707-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-04-01 510-707-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-03-25 510-319-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2016-03-25 510-319-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2016-03-25 510-319-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2016-03-25 510-369-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2016-03-25 510-369-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C RICHMOND 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.