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
2008-10-21 510-972-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2008-10-20 510-221-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J RICHMOND CA
2008-10-20 510-491-7XXX 7000–7999Assigned METROPCS, INC. 5562 FRNK GRNLF CA
2008-10-20 510-830-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD MN-PD CA
2008-10-13 510-240-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK GRNLF CA
2008-10-13 510-394-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD TRNID CA
2008-10-01 510-479-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2008-10-01 510-563-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2008-10-01 510-778-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2008-09-30 510-363-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2008-09-30 510-397-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2008-09-30 510-397-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2008-09-30 510-397-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2008-09-23 510-542-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2008-09-23 510-931-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2008-09-19 510-356-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2008-09-04 510-371-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2008-08-28 510-397-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2008-08-28 510-397-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2008-08-28 510-397-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2008-08-25 510-780-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HAYWARD CA
2008-08-20 510-371-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2008-08-20 510-371-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2008-08-18 510-837-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2008-08-18 510-837-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2008-08-12 510-904-2XXX 2000–2999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2008-08-12 510-904-7XXX 7000–7999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2008-08-12 510-904-8XXX 8000–8999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2008-08-07 510-371-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2008-08-04 510-987-6XXX 6000–6999Assigned METROPCS, INC. 5562 OKLD MN-PD CA
2008-08-01 510-545-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2008-08-01 510-629-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2008-08-01 510-969-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2008-08-01 510-969-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2008-08-01 510-995-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2008-07-21 510-780-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2008-07-16 510-394-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD TRNID CA
2008-07-11 510-227-4XXX 4000–4999Assigned METROPCS, INC. 5562 OKLD ALMD CA
2008-07-11 510-248-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2008-07-11 510-898-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2008-07-09 510-230-6XXX 6000–6999Assigned METROPCS, INC. 5562 RICHMOND CA
2008-07-09 510-789-6XXX 6000–6999Assigned METROPCS, INC. 5562 FRNK MAIN CA
2008-07-08 510-217-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD ALMD CA
2008-07-08 510-314-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2008-07-02 510-437-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2008-06-25 510-879-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2008-06-25 510-891-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2008-06-24 510-731-9XXX 9000–9999Assigned METROPCS, INC. 5562 HAYWARD CA
2008-06-23 510-778-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 RICHMOND CA
2008-06-23 510-803-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 HRCUL-RODE 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.