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
2017-10-19 510-571-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2017-10-19 510-571-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2017-10-19 510-571-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2017-10-19 510-822-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C OKLD TRNID CA
2017-10-19 510-822-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C OKLD TRNID CA
2017-10-19 510-822-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C OKLD TRNID CA
2017-10-12 510-941-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRNK GRNLF CA
2017-10-06 510-570-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD BKLY CA
2017-09-19 510-571-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2017-09-19 510-571-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2017-09-18 510-941-2XXX 2000–2999Assigned METROPCS, INC. 5562 FRNK GRNLF CA
2017-09-18 510-941-3XXX 3000–3999Assigned METROPCS, INC. 5562 FRNK GRNLF CA
2017-09-14 510-949-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HRCUL-RODE CA
2017-09-12 510-561-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD FRTVL CA
2017-09-12 510-561-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD FRTVL CA
2017-09-12 510-561-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD FRTVL CA
2017-09-12 510-561-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD FRTVL CA
2017-09-12 510-561-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD FRTVL CA
2017-09-07 510-571-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J HAYWARD CA
2017-08-31 510-822-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD TRNID CA
2017-08-16 510-571-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2017-08-07 510-519-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2017-08-07 510-570-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2017-07-31 510-993-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD BKLY CA
2017-07-28 510-561-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD FRTVL CA
2017-07-24 510-518-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FRNK MAIN CA
2017-07-24 510-806-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2017-07-11 510-726-2XXX 2000–2999Assigned TELNYX LLC 073H CROCKETT CA
2017-06-30 510-822-4XXX 4000–4999Assigned METROPCS, INC. 5562 OKLD TRNID CA
2017-06-30 510-949-2XXX 2000–2999Assigned METROPCS, INC. 5562 HRCUL-RODE CA
2017-06-27 510-241-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ELSBR-PINL CA
2017-06-27 510-361-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2017-05-31 510-514-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2017-05-31 510-514-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2017-05-31 510-514-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2017-05-31 510-738-1XXX 1000–1999Assigned TELNYX LLC 073H FRNK OLIVR CA
2017-05-31 510-949-8XXX 8000–8999Assigned TELNYX LLC 073H HRCUL-RODE CA
2017-05-23 510-561-1XXX 1000–1999Assigned TELNYX LLC 073H OKLD FRTVL CA
2017-05-23 510-822-3XXX 3000–3999Assigned TELNYX LLC 073H OKLD TRNID CA
2017-05-23 510-941-1XXX 1000–1999Assigned TELNYX LLC 073H FRNK GRNLF CA
2017-05-19 510-561-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C OKLD FRTVL CA
2017-05-19 510-660-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2017-05-19 510-822-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD TRNID CA
2017-05-19 510-947-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2017-05-19 510-993-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2017-05-18 510-319-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2017-05-18 510-602-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2017-05-18 510-826-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2017-05-18 510-890-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 RICHMOND CA
2017-05-18 510-941-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C 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.