NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 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, all time — NPA 586
COMCAST IP PHONE, LLC 110
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2022-10-05 586-301-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2022-10-05 586-301-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2022-10-05 586-301-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2022-10-05 586-301-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2022-07-06 586-837-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2022-07-06 586-837-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2020-10-19 586-300-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2020-10-19 586-300-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2016-09-20 586-251-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2016-04-27 586-371-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WASHINGTON MI
2016-04-26 586-267-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2016-02-09 586-488-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2015-12-30 586-252-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2015-11-03 586-210-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NEWBALTIMR MI
2015-10-20 586-315-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN MI
2015-10-01 586-272-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2015-09-30 586-204-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2015-08-19 586-333-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2015-08-12 586-999-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2015-07-07 586-204-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2015-04-15 586-785-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ROMEO MI
2015-03-26 586-488-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2015-03-20 586-204-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2015-02-23 586-459-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CENTERLINE MI
2014-12-16 586-765-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2014-12-09 586-578-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J CENTERLINE MI
2014-10-27 586-238-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2014-09-05 586-930-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2014-08-28 586-553-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2014-07-08 586-992-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WASHINGTON MI
2014-07-02 586-213-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2014-06-27 586-200-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2014-05-01 586-221-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2014-04-08 586-221-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2014-02-17 586-884-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2013-12-13 586-343-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2013-11-06 586-789-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2013-10-24 586-554-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2013-09-09 586-200-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2013-09-09 586-991-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J UTICA MI
2013-08-14 586-576-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J CENTERLINE MI
2013-07-31 586-846-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2013-05-24 586-393-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CENTERLINE MI
2013-04-10 586-200-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2013-04-05 586-229-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2013-01-22 586-786-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WASHINGTON MI
2012-09-27 586-961-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MT CLEMENS MI
2012-08-23 586-983-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WARREN MI
2012-06-04 586-359-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ROSEVILLE MI
2012-05-31 586-262-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J UTICA MI

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.