NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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, all time — NPA 650
COMCAST PHONE OF CALIFORNIA, LLC 95
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
2024-03-29 650-728-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MOSS BEACH CA
2023-02-06 650-912-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HALFMOONBY CA
2023-02-06 650-912-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HALFMOONBY CA
2022-09-29 650-668-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS ALTOS CA
2022-09-29 650-782-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS ALTOS CA
2020-09-20 650-699-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2020-09-20 650-699-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2020-03-16 650-379-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SSNFRNCSCO CA
2020-03-04 650-677-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SSNFRNCSCO CA
2019-04-11 650-405-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS ALTOS CA
2018-10-08 650-839-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L REDWOOD CY CA
2017-12-06 650-313-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PALO ALTO CA
2017-09-12 650-865-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2017-06-23 650-226-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNCRL-BLMT CA
2017-04-11 650-410-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SSNFRNCSCO CA
2016-12-08 650-993-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNFC JUNPR CA
2016-10-19 650-304-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PALO ALTO CA
2016-05-06 650-503-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L REDWOOD CY CA
2015-06-23 650-781-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2015-05-22 650-686-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MILLBRAE CA
2015-04-09 650-735-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PACIFICA CA
2015-03-06 650-850-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L WOODSIDE CA
2015-02-26 650-435-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2015-02-04 650-695-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MT VIEW CA
2014-10-02 650-665-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PALO ALTO CA
2014-08-06 650-727-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2014-07-15 650-549-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L REDWOOD CY CA
2014-07-15 650-622-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNCRL-BLMT CA
2014-06-24 650-861-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MT VIEW CA
2014-06-17 650-392-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SSNFRNCSCO CA
2014-06-05 650-656-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PALO ALTO CA
2014-03-25 650-437-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2014-02-14 650-713-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HALFMOONBY CA
2013-12-16 650-946-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS ALTOS CA
2013-10-18 650-445-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2013-09-09 650-272-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PALO ALTO CA
2013-07-18 650-232-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNCRL-BLMT CA
2013-07-18 650-537-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MT VIEW CA
2013-06-18 650-274-0XXX 0000–0999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2013-04-16 650-562-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L REDWOOD CY CA
2013-01-11 650-651-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MILLBRAE CA
2012-12-14 650-600-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PALO ALTO CA
2012-11-29 650-389-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2012-07-10 650-513-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA
2012-05-09 650-800-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PALO ALTO CA
2011-09-07 650-362-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L REDWOOD CY CA
2011-09-07 650-397-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L LOS ALTOS CA
2011-09-02 650-394-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SNCRL-BLMT CA
2011-09-01 650-336-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MT VIEW CA
2011-09-01 650-389-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SAN MATEO CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.