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
2016-11-16 510-513-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-11-16 510-513-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-11-16 510-513-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-11-16 510-513-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2016-11-14 510-913-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F OKLD MN-PD CA
2016-11-11 510-514-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2016-11-11 510-514-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2016-11-07 510-890-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2016-11-07 510-890-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2016-11-03 510-514-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 HAYWARD CA
2016-10-31 510-484-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2016-10-31 510-496-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2016-10-31 510-761-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 OKLD MN-PD CA
2016-10-26 510-817-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 OKLD MN-PD CA
2016-10-21 510-822-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-10-17 510-626-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-10-14 510-241-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2016-10-14 510-241-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ELSBR-PINL CA
2016-10-13 510-570-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD BKLY CA
2016-10-04 510-514-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2016-10-04 510-514-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2016-10-04 510-626-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-10-04 510-626-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-10-04 510-626-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD TRNID CA
2016-10-03 510-514-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2016-09-28 510-513-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FRNK MAIN CA
2016-09-26 510-570-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 OKLD BKLY CA
2016-09-21 510-901-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2016-09-20 510-240-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FRNK GRNLF CA
2016-09-19 510-514-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HAYWARD CA
2016-09-15 510-890-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 RICHMOND CA
2016-09-14 510-626-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F OKLD TRNID CA
2016-09-14 510-906-8XXX 8000–8999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F OKLD ALMD CA
2016-09-13 510-424-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2016-09-13 510-424-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2016-09-13 510-424-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 OKLD FRTVL CA
2016-09-13 510-726-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CROCKETT CA
2016-09-13 510-949-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HRCUL-RODE CA
2016-09-07 510-890-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F RICHMOND CA
2016-09-06 510-806-1XXX 1000–1999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F RICHMOND CA
2016-09-01 510-901-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2016-09-01 510-901-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2016-09-01 510-901-5XXX 5000–5999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2016-08-30 510-513-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2016-08-29 510-626-9XXX 9000–9999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F OKLD TRNID CA
2016-08-29 510-906-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F OKLD ALMD CA
2016-08-26 510-738-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F FRNK OLIVR CA
2016-08-25 510-726-0XXX 0000–0999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F CROCKETT CA
2016-08-24 510-901-2XXX 2000–2999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HAYWARD CA
2016-08-24 510-939-6XXX 6000–6999Assigned PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F HRCUL-RODE 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.