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
2013-01-24 510-270-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK OLIVR CA
2013-01-24 510-343-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD TRNID CA
2013-01-21 510-598-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 FRNK MAIN CA
2013-01-14 510-669-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ELSBR-PINL CA
2013-01-11 510-200-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HAYWARD CA
2013-01-07 510-210-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2013-01-07 510-210-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2012-12-31 510-400-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FRNK GRNLF CA
2012-12-31 510-803-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HRCUL-RODE CA
2012-12-31 510-948-9XXX 9000–9999Assigned METROPCS, INC. 5562 HRCUL-RODE CA
2012-12-19 510-298-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2012-12-19 510-298-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2012-12-19 510-298-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FRNK MAIN CA
2012-12-19 510-346-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2012-12-19 510-394-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E OKLD TRNID CA
2012-12-19 510-398-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C HAYWARD CA
2012-12-19 510-398-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HAYWARD CA
2012-12-19 510-401-3XXX 3000–3999Assigned ONVOY, LLC - CA 649C FRNK GRNLF CA
2012-12-19 510-455-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C CROCKETT CA
2012-12-19 510-573-7XXX 7000–7999Assigned ONVOY, LLC - CA 649C FRNK OLIVR CA
2012-12-19 510-592-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C HRCUL-RODE CA
2012-12-19 510-662-6XXX 6000–6999Assigned ONVOY, LLC - CA 649C ELSBR-PINL CA
2012-12-10 510-298-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2012-12-10 510-298-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2012-12-05 510-277-4XXX 4000–4999Assigned ONVOY, LLC - CA 649C OKLD BKLY CA
2012-12-03 510-398-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2012-11-30 510-454-1XXX 1000–1999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-2XXX 2000–2999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-3XXX 3000–3999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-4XXX 4000–4999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-5XXX 5000–5999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-6XXX 6000–6999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-30 510-454-7XXX 7000–7999Assigned PACIFIC BELL 9740 OKLD TRNID CA
2012-11-28 510-324-7XXX 7000–7999Assigned SONIC TELECOM, LLC - CA 433E FRNK GRNLF CA
2012-11-28 510-398-5XXX 5000–5999Assigned SONIC TELECOM, LLC - CA 433E HAYWARD CA
2012-11-28 510-775-7XXX 7000–7999Assigned SONIC TELECOM, LLC - CA 433E OKLD ALMD CA
2012-11-28 510-990-8XXX 8000–8999Assigned SONIC TELECOM, LLC - CA 433E OKLD BKLY CA
2012-11-19 510-269-1XXX 1000–1999Assigned SONIC TELECOM, LLC - CA 433E OKLD FRTVL CA
2012-11-19 510-788-7XXX 7000–7999Assigned SONIC TELECOM, LLC - CA 433E OKLD MN-PD CA
2012-11-19 510-924-5XXX 5000–5999Assigned SONIC TELECOM, LLC - CA 433E OKLD TRNID CA
2012-11-12 510-413-6XXX 6000–6999Assigned SONIC TELECOM, LLC - CA 433E FRNK OLIVR CA
2012-11-12 510-815-7XXX 7000–7999Assigned SONIC TELECOM, LLC - CA 433E ELSBR-PINL CA
2012-11-07 510-808-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L OKLD MN-PD CA
2012-10-30 510-401-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2012-10-30 510-404-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2012-10-29 510-398-8XXX 8000–8999Assigned AT&T ENTERPRISES, LLC 516C HAYWARD CA
2012-10-26 510-597-2XXX 2000–2999Assigned PAETEC ITEL, LLC 829J OKLD MN-PD CA
2012-10-15 510-335-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 FRNK MAIN CA
2012-10-10 510-359-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 HAYWARD CA
2012-10-02 510-359-1XXX 1000–1999Assigned METROPCS, INC. 5562 HAYWARD 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.