NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 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, all time — NPA 559
COMCAST PHONE OF CALIFORNIA, LLC 138
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
2026-01-05 559-529-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L TIPTON CA
2025-02-05 559-523-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PIXLEY CA
2025-02-05 559-588-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L ALPAUGH CA
2025-02-05 559-883-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L PORTERVL CA
2024-03-29 559-357-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HANFORD CA
2024-03-29 559-357-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HANFORD CA
2023-11-01 559-881-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2023-11-01 559-881-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2023-11-01 559-881-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2023-11-01 559-881-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2023-11-01 559-881-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2023-02-21 559-620-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L SELMA CA
2023-01-17 559-851-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HURON CA
2022-10-05 559-767-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLOVIS CA
2022-10-05 559-767-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLOVIS CA
2022-10-05 559-767-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLOVIS CA
2022-10-05 559-810-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CARUTHERS CA
2022-06-09 559-617-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L KINGSBURG CA
2020-09-18 559-314-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLOVIS CA
2020-09-18 559-314-9XXX 9000–9999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLOVIS CA
2020-09-16 559-209-1XXX 1000–1999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-209-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-209-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-319-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-319-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-319-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-421-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-09-16 559-570-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-08-14 559-570-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-06-12 559-553-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2020-03-24 559-570-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-03-03 559-570-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2020-01-22 559-645-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L MADERA CA
2019-10-10 559-388-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2019-04-11 559-491-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L HANFORD CA
2019-04-11 559-648-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L DINUBA CA
2019-04-02 559-608-5XXX 5000–5999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2019-02-19 559-878-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2019-02-19 559-878-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2018-11-20 559-712-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L CLOVIS CA
2018-08-29 559-319-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2018-05-30 559-878-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2018-02-28 559-653-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FOWLER CA
2017-11-28 559-705-6XXX 6000–6999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2017-03-06 559-293-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2017-03-06 559-293-4XXX 4000–4999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2017-02-07 559-409-2XXX 2000–2999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2016-12-14 559-290-7XXX 7000–7999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L FRESNO CA
2016-12-07 559-690-3XXX 3000–3999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA CA
2016-12-07 559-931-8XXX 8000–8999Assigned COMCAST PHONE OF CALIFORNIA, LLC 394L VISALIA 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.