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 203
COMCAST IP PHONE, LLC 81
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
2020-09-24 203-793-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J WALLINGFD CT
2017-10-02 203-806-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J CHESHIRE CT
2017-08-21 203-303-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J WALLINGFD CT
2015-12-30 203-390-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2015-06-22 203-741-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WALLINGFD CT
2015-01-23 203-457-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J GUILFORD CT
2014-12-29 203-712-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J HUNTINGTON CT
2014-09-11 203-439-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CHESHIRE CT
2014-08-04 203-421-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MADISON CT
2014-03-19 203-441-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WOLCOTT CT
2014-01-16 203-456-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2013-10-18 203-725-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2013-08-30 203-780-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2013-07-10 203-266-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J WOODBURY CT
2012-12-06 203-456-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2012-12-05 203-533-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J GUILFORD CT
2012-11-02 203-678-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WALLINGFD CT
2012-06-11 203-894-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J RIDGEFIELD CT
2012-03-08 203-538-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J HUNTINGTON CT
2012-03-07 203-889-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2011-10-28 203-917-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2011-08-26 203-714-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J NAUGATUCK CT
2010-09-23 203-821-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2010-09-03 203-421-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MADISON CT
2010-09-03 203-626-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WALLINGFD CT
2010-08-30 203-805-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2010-08-23 203-493-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J GEORGETOWN CT
2010-08-19 203-917-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2010-07-12 203-308-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J ANSONIDRBY CT
2009-12-14 203-828-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SEYMOUR CT
2009-09-30 203-208-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J BRANFORD CT
2009-09-23 203-208-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BRANFORD CT
2009-08-19 203-437-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2009-07-24 203-689-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J GUILFORD CT
2009-02-20 203-628-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2008-11-14 203-403-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J RIDGEFIELD CT
2008-08-27 203-513-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J HUNTINGTON CT
2008-08-27 203-553-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2008-08-04 203-433-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J BRANFORD CT
2008-02-26 203-632-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J NAUGATUCK CT
2008-02-07 203-527-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2008-02-07 203-527-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2007-12-27 203-942-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2007-10-15 203-516-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J ANSONIDRBY CT
2007-08-27 203-443-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J MERIDEN CT
2007-08-09 203-528-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2007-08-09 203-528-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J WATERBURY CT
2007-07-25 203-616-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DANBURY CT
2007-01-11 203-507-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT
2007-01-11 203-691-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J NEW HAVEN CT

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.