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
2018-02-28 510-605-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2018-02-26 510-626-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2018-02-21 510-603-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD FRTVL CA
2018-02-09 510-650-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELSBR-PINL CA
2018-01-23 510-947-5XXX 5000–5999Assigned SONIC TELECOM, LLC - CA 433E OKLD MN-PD CA
2018-01-18 510-616-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2018-01-18 510-616-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2018-01-18 510-616-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2018-01-10 510-738-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK OLIVR CA
2018-01-08 510-616-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2018-01-03 510-265-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2018-01-03 510-571-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2018-01-03 510-650-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2017-12-22 510-941-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C FRNK GRNLF CA
2017-12-22 510-947-9XXX 9000–9999Assigned SONIC TELECOM, LLC - CA 433E OKLD MN-PD CA
2017-12-21 510-650-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2017-12-21 510-650-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2017-12-20 510-890-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2017-12-19 510-947-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2017-12-19 510-947-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2017-12-18 510-616-0XXX 0000–0999Assigned SONIC TELECOM, LLC - CA 433E OKLD BKLY CA
2017-12-18 510-616-1XXX 1000–1999Assigned SONIC TELECOM, LLC - CA 433E OKLD BKLY CA
2017-12-18 510-616-2XXX 2000–2999Assigned SONIC TELECOM, LLC - CA 433E OKLD BKLY CA
2017-12-14 510-602-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2017-12-14 510-602-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2017-12-14 510-602-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2017-12-14 510-602-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2017-12-08 510-890-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2017-12-08 510-890-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2017-12-07 510-571-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2017-11-29 510-855-0XXX 0000–0999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD MN-PD CA
2017-11-29 510-855-1XXX 1000–1999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD MN-PD CA
2017-11-29 510-855-2XXX 2000–2999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD MN-PD CA
2017-11-29 510-855-3XXX 3000–3999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD MN-PD CA
2017-11-29 510-855-4XXX 4000–4999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD MN-PD CA
2017-11-29 510-855-5XXX 5000–5999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD MN-PD CA
2017-11-29 510-855-6XXX 6000–6999Assigned UTILITY TELECOM GROUP, LLC - CA 9262 OKLD MN-PD CA
2017-11-28 510-602-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2017-11-28 510-747-5XXX 5000–5999Assigned METROPCS, INC. 5562 OKLD ALMD CA
2017-11-22 510-519-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2017-11-22 510-519-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2017-11-09 510-602-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK MAIN CA
2017-11-09 510-602-4XXX 4000–4999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK MAIN CA
2017-11-09 510-602-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK MAIN CA
2017-11-02 510-738-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2017-11-02 510-738-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2017-11-01 510-561-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD FRTVL CA
2017-10-24 510-941-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK GRNLF CA
2017-10-19 510-518-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2017-10-19 510-518-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C 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.