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 508
COMCAST IP PHONE, LLC 112
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
2022-08-04 508-257-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J SIASCONSET MA
2021-08-04 508-289-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J FALMOUTH MA
2020-10-01 508-562-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BROCKTON MA
2020-10-01 508-562-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J BROCKTON MA
2019-10-24 508-684-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J VINEYRDHVN MA
2019-10-09 508-403-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CATAUMET MA
2019-08-26 508-239-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J FRAMINGHAM MA
2019-02-28 508-256-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J BROCKTON MA
2018-10-30 508-437-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J BARNSTABLE MA
2018-04-03 508-300-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J FALL RIVER MA
2018-03-28 508-424-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J FRAMINGHAM MA
2018-02-15 508-219-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J EASTON MA
2017-09-20 508-443-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J BRIDGEWTR MA
2017-09-08 508-619-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J DENNIS MA
2016-12-28 508-530-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J FRANKLIN MA
2016-05-31 508-258-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DENNIS MA
2015-11-09 508-715-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J EBRIDGEWTR MA
2015-08-26 508-338-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J VINEYRDHVN MA
2015-08-25 508-566-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J CATAUMET MA
2015-07-31 508-644-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J ASSONET MA
2015-06-30 508-742-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J NEWBEDFORD MA
2015-04-16 508-219-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J EASTON MA
2015-03-05 508-928-0XXX 0000–0999Assigned COMCAST IP PHONE, LLC 318J BLACKSTONE MA
2015-01-12 508-720-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J NATICK MA
2014-12-31 508-576-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J NO ATTLEBO MA
2014-11-18 508-322-9XXX 9000–9999Assigned COMCAST IP PHONE, LLC 318J WAREHAM MA
2014-09-11 508-738-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J TAUNTON MA
2014-08-05 508-807-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J BRIDGEWTR MA
2014-07-17 508-734-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J WALPOLE MA
2014-06-13 508-952-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J NORTON MA
2014-05-28 508-694-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J DENNIS MA
2013-12-13 508-298-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J FRANKLIN MA
2013-10-14 508-915-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J SOUTHGATE MA
2013-09-09 508-639-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J SOUTHGATE MA
2013-07-17 508-630-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J MARLBORO MA
2013-04-01 508-545-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J NATICK MA
2012-12-06 508-861-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J FRAMINGHAM MA
2012-09-26 508-338-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J VINEYRDHVN MA
2012-06-11 508-825-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J NANTUCKET MA
2012-06-01 508-619-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J DENNIS MA
2012-04-23 508-348-5XXX 5000–5999Assigned COMCAST IP PHONE, LLC 318J CHATHAM MA
2012-04-17 508-465-1XXX 1000–1999Assigned COMCAST IP PHONE, LLC 318J CARVER MA
2012-04-05 508-356-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J CATAUMET MA
2011-11-04 508-419-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J OSTERVILLE MA
2011-08-29 508-861-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J FRAMINGHAM MA
2011-08-26 508-827-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J HYANNIS MA
2011-08-09 508-927-4XXX 4000–4999Assigned COMCAST IP PHONE, LLC 318J PLYMOUTH MA
2011-07-13 508-619-7XXX 7000–7999Assigned COMCAST IP PHONE, LLC 318J DENNIS MA
2011-06-14 508-684-8XXX 8000–8999Assigned COMCAST IP PHONE, LLC 318J VINEYRDHVN MA
2011-01-17 508-381-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J MILFORD MA

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.