NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

4 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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
2002-06-28 510-248-5XXX 5000–5999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-6XXX 6000–6999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-7XXX 7000–7999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-06-28 510-248-8XXX 8000–8999Assigned PACIFIC BELL 9740 FRNK MAIN CA
2002-04-17 510-243-4XXX 4000–4999Assigned PACIFIC BELL 9740 ELSBR-PINL CA
2002-04-12 510-248-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2001-09-07 510-343-8XXX 8000–8999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 OKLD TRNID CA
2001-07-04 510-275-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ELSBR-PINL CA
2001-07-04 510-373-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD ALMD CA
2001-07-04 510-401-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J FRNK GRNLF CA
2001-07-04 510-402-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK MAIN CA
2001-07-04 510-431-5XXX 5000–5999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J FRNK GRNLF CA
2001-07-04 510-439-4XXX 4000–4999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J RICHMOND CA
2001-07-04 510-485-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD FRTVL CA
2001-07-04 510-576-4XXX 4000–4999Assigned AT&T - LOCAL 7421 HAYWARD CA
2001-07-04 510-637-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 OKLD MN-PD CA
2001-07-04 510-662-3XXX 3000–3999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J ELSBR-PINL CA
2001-07-04 510-686-2XXX 2000–2999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD TRNID CA
2001-07-04 510-698-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD FRTVL CA
2001-07-04 510-722-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CROCKETT CA
2001-07-04 510-803-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J HRCUL-RODE CA
2001-07-04 510-824-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2001-07-04 510-899-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD MN-PD CA
2001-07-04 510-965-6XXX 6000–6999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J RICHMOND CA
2001-07-04 510-982-7XXX 7000–7999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD BKLY CA
2001-07-04 510-982-8XXX 8000–8999Assigned U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD BKLY CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.