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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2016-03-25 510-820-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD TRNID CA
2016-03-24 510-330-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2016-03-24 510-330-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2016-03-24 510-345-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2016-03-24 510-345-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2016-03-24 510-737-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2016-03-24 510-737-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2016-03-24 510-761-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2016-03-24 510-761-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C OKLD MN-PD CA
2016-03-24 510-937-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C CROCKETT CA
2016-03-24 510-937-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C CROCKETT CA
2016-03-22 510-330-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2016-03-21 510-369-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 RICHMOND CA
2016-03-17 510-458-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-03-17 510-737-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-03-11 510-737-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-03-11 510-737-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-03-09 510-640-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2016-03-08 510-871-9XXX 9000–9999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2016-03-08 510-939-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C HRCUL-RODE CA
2016-03-04 510-330-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2016-03-04 510-330-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2016-03-04 510-330-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2016-03-02 510-369-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2016-03-01 510-740-9XXX 9000–9999Assigned SONIC TELECOM, LLC - CA 433E OKLD MN-PD CA
2016-02-26 510-319-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 FRNK OLIVR CA
2016-02-22 510-694-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 OKLD ALMD CA
2016-02-22 510-871-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 OKLD ALMD CA
2016-02-22 510-907-2XXX 2000–2999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 OKLD MN-PD CA
2016-02-16 510-241-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2016-02-16 510-241-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2016-02-16 510-345-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2016-02-16 510-345-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2016-02-16 510-369-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2016-02-16 510-369-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2016-02-16 510-422-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C OKLD FRTVL CA
2016-02-16 510-422-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C OKLD FRTVL CA
2016-02-16 510-694-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2016-02-16 510-694-8XXX 8000–8999Assigned ONVOY, LLC - CA 649C OKLD ALMD CA
2016-02-12 510-241-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2016-02-12 510-241-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2016-02-12 510-634-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2016-02-12 510-634-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2016-02-12 510-939-2XXX 2000–2999Assigned ONVOY, LLC - CA 649C HRCUL-RODE CA
2016-02-12 510-939-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C HRCUL-RODE CA
2016-02-11 510-942-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RICHMOND CA
2016-02-11 510-963-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2016-02-04 510-369-0XXX 0000–0999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2016-02-04 510-369-1XXX 1000–1999Assigned ONVOY, LLC - CA 649C RICHMOND CA
2016-02-03 510-945-1XXX 1000–1999Assigned 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.