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 978
IP HORIZON LLC 101
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
2019-03-27 978-247-0XXX 0000–0999Assigned IP HORIZON LLC 515J ANDOVER MA
2019-03-27 978-572-8XXX 8000–8999Assigned IP HORIZON LLC 515J NEWBURYPT MA
2019-03-27 978-650-4XXX 4000–4999Assigned IP HORIZON LLC 515J PEPPERELL MA
2019-03-27 978-860-9XXX 9000–9999Assigned IP HORIZON LLC 515J LEOMINSTER MA
2019-03-27 978-893-4XXX 4000–4999Assigned IP HORIZON LLC 515J ACTON MA
2019-03-27 978-908-4XXX 4000–4999Assigned IP HORIZON LLC 515J ACTON MA
2019-03-27 978-962-5XXX 5000–5999Assigned IP HORIZON LLC 515J LEOMINSTER MA
2017-06-12 978-644-8XXX 8000–8999Assigned IP HORIZON LLC 515J GEORGETOWN MA
2017-06-12 978-708-9XXX 9000–9999Assigned IP HORIZON LLC 515J GROTON MA
2017-06-12 978-850-0XXX 0000–0999Assigned IP HORIZON LLC 515J WESTFORD MA
2017-06-12 978-875-8XXX 8000–8999Assigned IP HORIZON LLC 515J HUDSON MA
2017-06-12 978-962-0XXX 0000–0999Assigned IP HORIZON LLC 515J LEOMINSTER MA
2017-06-08 978-827-9XXX 9000–9999Assigned IP HORIZON LLC 515J ASHBURNHAM MA
2016-06-03 978-908-3XXX 3000–3999Assigned IP HORIZON LLC 515J ACTON MA
2016-06-01 978-212-7XXX 7000–7999Assigned IP HORIZON LLC 515J HUDSON MA
2016-06-01 978-227-9XXX 9000–9999Assigned IP HORIZON LLC 515J LEOMINSTER MA
2016-06-01 978-233-5XXX 5000–5999Assigned IP HORIZON LLC 515J HAMILTON MA
2016-06-01 978-321-8XXX 8000–8999Assigned IP HORIZON LLC 515J WINCHENDON MA
2016-06-01 978-350-8XXX 8000–8999Assigned IP HORIZON LLC 515J TEMPLETON MA
2016-06-01 978-381-6XXX 6000–6999Assigned IP HORIZON LLC 515J GLOUCESTER MA
2016-06-01 978-451-8XXX 8000–8999Assigned IP HORIZON LLC 515J CONCORD MA
2016-06-01 978-493-8XXX 8000–8999Assigned IP HORIZON LLC 515J MAYNARD MA
2016-06-01 978-510-9XXX 9000–9999Assigned IP HORIZON LLC 515J W NEWBURY MA
2016-06-01 978-515-1XXX 1000–1999Assigned IP HORIZON LLC 515J GLOUCESTER MA
2016-06-01 978-517-9XXX 9000–9999Assigned IP HORIZON LLC 515J AMESBURY MA
2016-06-01 978-520-8XXX 8000–8999Assigned IP HORIZON LLC 515J WILMINGTON MA
2016-06-01 978-523-8XXX 8000–8999Assigned IP HORIZON LLC 515J TOWNSEND MA
2016-06-01 978-581-4XXX 4000–4999Assigned IP HORIZON LLC 515J ORANGE MA
2016-06-01 978-582-2XXX 2000–2999Assigned IP HORIZON LLC 515J LUNENBURG MA
2016-06-01 978-584-1XXX 1000–1999Assigned IP HORIZON LLC 515J BILLERICA MA
2016-06-01 978-607-8XXX 8000–8999Assigned IP HORIZON LLC 515J SALEM MA
2016-06-01 978-607-9XXX 9000–9999Assigned IP HORIZON LLC 515J SALEM MA
2016-06-01 978-610-8XXX 8000–8999Assigned IP HORIZON LLC 515J CONCORD MA
2016-06-01 978-634-8XXX 8000–8999Assigned IP HORIZON LLC 515J BOLTON MA
2016-06-01 978-647-9XXX 9000–9999Assigned IP HORIZON LLC 515J TOPSFIELD MA
2016-06-01 978-650-8XXX 8000–8999Assigned IP HORIZON LLC 515J PEPPERELL MA
2016-06-01 978-665-1XXX 1000–1999Assigned IP HORIZON LLC 515J FITCHBURG MA
2016-06-01 978-672-1XXX 1000–1999Assigned IP HORIZON LLC 515J PRINCETON MA
2016-06-01 978-706-9XXX 9000–9999Assigned IP HORIZON LLC 515J CLINTON MA
2016-06-01 978-719-2XXX 2000–2999Assigned IP HORIZON LLC 515J ANDOVER MA
2016-06-01 978-731-1XXX 1000–1999Assigned IP HORIZON LLC 515J WESTMINSTR MA
2016-06-01 978-756-9XXX 9000–9999Assigned IP HORIZON LLC 515J PETERSHAM MA
2016-06-01 978-768-1XXX 1000–1999Assigned IP HORIZON LLC 515J ESSEX MA
2016-06-01 978-796-9XXX 9000–9999Assigned IP HORIZON LLC 515J AYER MA
2016-06-01 978-908-2XXX 2000–2999Assigned IP HORIZON LLC 515J ACTON MA
2016-06-01 978-948-0XXX 0000–0999Assigned IP HORIZON LLC 515J ROWLEY MA
2016-06-01 978-958-1XXX 1000–1999Assigned IP HORIZON LLC 515J GARDNER MA
2016-06-01 978-961-8XXX 8000–8999Assigned IP HORIZON LLC 515J NEWBURYPT MA
2016-06-01 978-966-8XXX 8000–8999Assigned IP HORIZON LLC 515J DANVERS MA
2015-10-01 978-277-4XXX 4000–4999Assigned IP HORIZON LLC 515J TEMPLETON 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.