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 571
COMCAST IP PHONE, LLC 194
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
2025-06-26 571-703-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2023-04-07 571-573-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J NOKESVILLE VA
2019-10-03 571-413-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DULLES VA
2019-06-06 571-404-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J BRADDOCK VA
2019-05-01 571-752-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2019-04-24 571-440-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J LEESBURG VA
2018-12-17 571-407-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
2018-12-17 571-407-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
2018-12-11 571-407-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
2018-12-11 571-407-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
2018-07-12 571-324-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2018-07-10 571-347-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2018-07-10 571-347-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2018-07-03 571-378-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2018-07-03 571-378-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2018-06-21 571-523-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2018-05-21 571-867-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2018-05-10 571-595-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
2018-05-02 571-324-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2018-04-27 571-369-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2017-11-30 571-831-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J LEESBURG VA
2017-10-10 571-361-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MANASSAS VA
2017-09-22 571-655-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BRADDOCK VA
2017-07-14 571-655-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BRADDOCK VA
2017-06-16 571-457-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2017-05-09 571-642-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ENGLESIDE VA
2017-05-08 571-371-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2017-03-13 571-427-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J OCCOQUAN VA
2017-01-20 571-459-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN19 VA
2016-10-14 571-376-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2016-08-26 571-565-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2016-08-11 571-525-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2016-06-07 571-800-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2016-05-16 571-665-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2016-04-27 571-707-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J LEESBURG VA
2016-04-26 571-444-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2016-04-12 571-489-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2016-03-02 571-552-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2016-02-11 571-800-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2016-02-09 571-552-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2016-02-09 571-719-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MANASSAS VA
2015-12-18 571-719-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J MANASSAS VA
2015-12-18 571-800-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2015-09-15 571-777-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2015-08-20 571-777-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2015-07-23 571-290-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2015-07-22 571-620-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WSNGTNZN17 VA
2015-07-02 571-599-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA
2015-05-26 571-589-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J DALE CITY VA
2015-04-03 571-665-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HERNDON VA

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.