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
2006-09-01 510-542-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2006-08-30 510-691-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HRCUL-RODE CA
2006-08-25 510-463-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2006-08-25 510-992-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2006-08-15 510-350-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2006-08-10 510-274-8XXX 8000–8999Assigned METROPCS, INC. 5562 HAYWARD CA
2006-08-06 510-586-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2006-08-06 510-690-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2006-08-06 510-731-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2006-08-04 510-404-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRNK GRNLF CA
2006-08-04 510-578-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2006-08-04 510-619-7XXX 7000–7999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RICHMOND CA
2006-08-04 510-952-8XXX 8000–8999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRNK GRNLF CA
2006-08-01 510-962-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2006-08-01 510-962-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2006-07-24 510-260-9XXX 9000–9999Assigned METROPCS, INC. 5562 RICHMOND CA
2006-07-24 510-722-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CROCKETT CA
2006-07-24 510-725-8XXX 8000–8999Assigned METROPCS, INC. 5562 OKLD BKLY CA
2006-07-17 510-274-9XXX 9000–9999Assigned METROPCS, INC. 5562 HAYWARD CA
2006-07-14 510-250-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2006-07-13 510-648-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2006-07-13 510-648-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2006-07-13 510-648-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2006-07-13 510-779-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ELSBR-PINL CA
2006-07-13 510-965-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2006-07-13 510-965-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2006-07-13 510-984-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD BKLY CA
2006-07-12 510-342-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2006-07-07 510-493-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2006-07-05 510-338-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2006-07-05 510-479-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2006-06-23 510-374-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2006-06-23 510-374-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2006-06-23 510-374-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2006-06-14 510-374-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2006-06-13 510-690-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2006-06-09 510-274-5XXX 5000–5999Assigned AT&T ENTERPRISES, LLC 516C HAYWARD CA
2006-06-09 510-725-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2006-06-09 510-725-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2006-05-15 510-529-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C OKLD BKLY CA
2006-05-15 510-691-0XXX 0000–0999Assigned METROPCS, INC. 5562 HRCUL-RODE CA
2006-05-15 510-817-4XXX 4000–4999Assigned AT&T ENTERPRISES, LLC 516C OKLD MN-PD CA
2006-05-15 510-921-0XXX 0000–0999Assigned METROPCS, INC. 5562 HAYWARD CA
2006-05-12 510-493-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2006-05-12 510-529-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2006-05-12 510-566-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2006-05-12 510-566-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2006-05-08 510-374-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2006-05-08 510-648-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2006-05-08 510-648-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN 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.