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
2012-01-13 510-294-6XXX 6000–6999Assigned PACIFIC BELL 9740 HAYWARD CA
2012-01-13 510-294-7XXX 7000–7999Assigned PACIFIC BELL 9740 HAYWARD CA
2012-01-09 510-246-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2011-12-28 510-322-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 HRCUL-RODE CA
2011-12-22 510-478-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2011-12-22 510-479-2XXX 2000–2999Assigned METROPCS, INC. 5562 OKLD FRTVL CA
2011-12-22 510-682-1XXX 1000–1999Assigned METROPCS, INC. 5562 OKLD ALMD CA
2011-12-22 510-723-4XXX 4000–4999Assigned METROPCS, INC. 5562 HAYWARD CA
2011-12-22 510-771-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2011-12-22 510-900-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD BKLY CA
2011-12-14 510-844-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD MN-PD CA
2011-12-12 510-447-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2011-12-07 510-255-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2011-12-07 510-722-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CROCKETT CA
2011-12-05 510-358-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2011-12-05 510-358-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2011-11-21 510-318-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2011-11-21 510-858-5XXX 5000–5999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OKLD MN-PD CA
2011-11-21 510-858-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OKLD MN-PD CA
2011-11-18 510-588-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD MN-PD CA
2011-11-11 510-564-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD TRNID CA
2011-11-04 510-294-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2011-11-04 510-417-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2011-11-02 510-246-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2011-11-01 510-800-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2011-11-01 510-800-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2011-10-21 510-768-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2011-10-20 510-692-0XXX 0000–0999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2011-10-14 510-900-2XXX 2000–2999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OKLD BKLY CA
2011-10-04 510-246-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2011-09-27 510-327-9XXX 9000–9999Assigned METROPCS, INC. 5562 HRCUL-RODE CA
2011-09-20 510-250-9XXX 9000–9999Assigned AT&T ENTERPRISES, LLC 516C OKLD MN-PD CA
2011-09-19 510-244-8XXX 8000–8999Assigned METROPCS, INC. 5562 HAYWARD CA
2011-09-19 510-244-9XXX 9000–9999Assigned METROPCS, INC. 5562 HAYWARD CA
2011-09-19 510-858-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OKLD MN-PD CA
2011-09-16 510-275-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ELSBR-PINL CA
2011-09-15 510-254-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD ALMD CA
2011-09-13 510-313-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HRCUL-RODE CA
2011-09-13 510-358-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2011-09-13 510-358-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2011-09-12 510-746-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD TRNID CA
2011-09-08 510-244-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2011-09-08 510-358-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK MAIN CA
2011-09-08 510-878-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2011-09-07 510-255-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L RICHMOND CA
2011-09-07 510-858-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2011-09-01 510-239-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD ALMD CA
2011-09-01 510-243-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ELSBR-PINL CA
2011-09-01 510-877-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C OKLD TRNID CA
2011-08-31 510-400-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK GRNLF 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.