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 443
COMCAST IP PHONE, LLC 355
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
2023-11-20 443-717-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2023-11-20 443-717-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2023-11-20 443-717-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2023-11-20 443-717-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J BALTIMORE MD
2021-09-14 443-487-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WESTMINSTR MD
2021-02-12 443-669-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J DELMAR MD
2021-02-12 443-888-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PRINCEANNE MD
2021-02-12 443-972-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CAMBRIDGE MD
2020-09-24 443-209-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J HAVREGRACE MD
2020-01-24 443-946-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J PARKVILLE MD
2019-11-07 443-373-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J OCEAN CITY MD
2019-07-29 443-705-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J COCKEYSVL MD
2019-06-10 443-450-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PIKESVILLE MD
2019-04-10 443-376-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J DUNDALK MD
2019-03-01 443-420-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ELLICOTTCY MD
2018-11-12 443-405-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J RANDALLSTN MD
2018-09-04 443-596-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2018-09-04 443-628-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2018-02-02 443-609-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SYKESVILLE MD
2018-01-08 443-781-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ARGRGBSNIS MD
2017-12-29 443-450-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PIKESVILLE MD
2017-11-09 443-348-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WOODLAWN MD
2017-07-31 443-358-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SALISBURY MD
2017-07-17 443-596-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2017-06-22 443-513-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J BERLIN MD
2017-06-09 443-664-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J OCEAN CITY MD
2017-06-06 443-639-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J HAMPSTEAD MD
2017-05-18 443-689-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J COCKEYSVL MD
2017-03-20 443-592-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ELKRIDGE MD
2016-12-30 443-744-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J REISTERSTN MD
2016-11-22 443-679-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J SEVERN MD
2016-11-22 443-725-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J PARKVILLE MD
2016-11-11 443-373-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J OCEAN CITY MD
2016-11-10 443-646-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NORTHBEACH MD
2016-09-16 443-715-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NORTH EAST MD
2016-08-19 443-819-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J BEL AIR MD
2016-08-02 443-698-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J ODENTON MD
2016-05-27 443-587-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2016-05-26 443-587-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J EDGEWOOD MD
2016-05-13 443-295-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PRINCEFRCK MD
2016-04-27 443-652-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J TOWSON MD
2016-04-26 443-495-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J PARKVILLE MD
2016-04-11 443-530-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J DUNDALK MD
2016-04-06 443-968-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J PRINCEFRCK MD
2016-03-31 443-398-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J SYKESVILLE MD
2016-03-25 443-960-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J GLENBURNIE MD
2016-03-15 443-893-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WOODLAWN MD
2016-03-11 443-730-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J ESSEX MD
2016-02-11 443-978-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J SALISBURY MD
2016-01-15 443-898-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J PIKESVILLE MD

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.