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 815
COMCAST IP PHONE, LLC 151
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
2023-06-09 815-655-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J COAL CITY IL
2023-02-17 815-498-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J SOMONAUK IL
2021-06-30 815-596-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J MARENGO IL
2020-11-19 815-970-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J SYCAMORE IL
2020-03-16 815-201-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J SHERIDAN IL
2020-03-16 815-658-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J NEWARK IL
2020-02-12 815-269-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J DANFORTH IL
2020-02-12 815-707-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J GILMAN IL
2017-07-05 815-660-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LOCKPORT IL
2017-06-20 815-648-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J HEBRON IL
2016-07-19 815-375-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DE KALB IL
2016-05-05 815-322-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J MCHENRY IL
2015-08-24 815-719-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PRINCETON IL
2015-05-06 815-329-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ROCKFORD IL
2015-04-16 815-240-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J ROCK CUT IL
2015-01-13 815-786-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J SANDWICH IL
2014-09-30 815-880-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WOODSTOCK IL
2014-09-24 815-905-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J LOCKPORT IL
2014-09-15 815-585-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MORRIS IL
2014-06-10 815-705-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J MORRIS IL
2013-11-07 815-888-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J ROCHELLE IL
2013-11-06 815-213-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J STERLING IL
2013-10-15 815-552-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J LOCKPORT IL
2013-08-27 815-994-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J DIXON IL
2013-04-29 815-255-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J MINOOKA IL
2013-04-22 815-650-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J FREEPORT IL
2013-04-04 815-323-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BELVIDERE IL
2012-12-17 815-401-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J KANKAKEE IL
2012-06-06 815-320-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J NEW LENOX IL
2012-05-23 815-331-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MCHENRY IL
2012-05-23 815-716-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J STERLING IL
2012-05-09 815-782-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PLAINFIELD IL
2012-04-05 815-267-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PLAINFIELD IL
2012-04-05 815-513-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J MORRIS IL
2012-01-24 815-448-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J MAZON IL
2011-11-08 815-552-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J LOCKPORT IL
2011-02-24 815-733-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PLAINFIELD IL
2010-12-02 815-506-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J UNION IL
2010-09-01 815-255-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MINOOKA IL
2010-06-25 815-632-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J STERLING IL
2010-06-25 815-677-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J DIXON IL
2010-04-15 815-526-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CRYSTAL LK IL
2008-12-16 815-563-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CEDARVILLE IL
2008-11-14 815-523-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J KANKAKEE IL
2008-09-08 815-293-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J LOCKPORT IL
2008-07-08 815-322-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MCHENRY IL
2008-06-25 815-977-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ROCKFORD IL
2008-06-25 815-977-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J ROCKFORD IL
2008-06-25 815-977-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ROCKFORD IL
2008-06-10 815-733-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J PLAINFIELD IL

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.