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
2006-05-05 510-292-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD BKLY CA
2006-05-03 510-274-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 HAYWARD CA
2006-05-03 510-374-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 RICHMOND CA
2006-05-03 510-457-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD MN-PD CA
2006-05-03 510-474-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 FRNK GRNLF CA
2006-05-03 510-488-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD FRTVL CA
2006-05-03 510-492-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 FRNK OLIVR CA
2006-05-03 510-564-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD TRNID CA
2006-05-03 510-647-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD BKLY CA
2006-05-03 510-764-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD ALMD CA
2006-05-03 510-896-7XXX 7000–7999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 FRNK MAIN CA
2006-04-21 510-280-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 OKLD BKLY CA
2006-04-11 510-374-6XXX 6000–6999Assigned AT&T ENTERPRISES, LLC 516C RICHMOND CA
2006-04-11 510-431-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C FRNK GRNLF CA
2006-04-10 510-229-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2006-04-10 510-896-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2006-03-31 510-725-9XXX 9000–9999Assigned METROPCS, INC. 5562 OKLD BKLY CA
2006-03-28 510-380-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2006-03-15 510-467-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2006-03-10 510-263-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C OKLD ALMD CA
2006-03-10 510-270-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C FRNK OLIVR CA
2006-03-10 510-479-3XXX 3000–3999Assigned AT&T ENTERPRISES, LLC 516C OKLD FRTVL CA
2006-03-08 510-827-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2006-02-28 510-856-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2006-02-28 510-943-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2006-02-16 510-542-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2006-02-13 510-573-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2006-02-10 510-755-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2006-02-09 510-227-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2006-02-09 510-662-4XXX 4000–4999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ELSBR-PINL CA
2006-02-08 510-619-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2006-02-03 510-500-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD FRTVL CA
2006-02-02 510-808-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD MN-PD CA
2006-01-11 510-323-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2006-01-11 510-323-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 RICHMOND CA
2006-01-11 510-731-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2006-01-11 510-731-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2006-01-11 510-735-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2006-01-11 510-735-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2006-01-11 510-735-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2006-01-11 510-735-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2006-01-11 510-735-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2006-01-05 510-921-1XXX 1000–1999Assigned METROPCS, INC. 5562 HAYWARD CA
2006-01-05 510-921-2XXX 2000–2999Assigned METROPCS, INC. 5562 HAYWARD CA
2006-01-05 510-943-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2005-12-28 510-786-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2005-12-28 510-786-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2005-12-28 510-931-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2005-12-28 510-931-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2005-12-27 510-379-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD MN-PD 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.