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 501
E. RITTER COMMUNICATIONS, LLC 29
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
2026-08-18 501-284-8XXX 8000–8999Assigned E. RITTER COMMUNICATIONS, LLC 128L JUDSONIA AR
2026-08-18 501-299-4XXX 4000–4999Assigned E. RITTER COMMUNICATIONS, LLC 128L KENSETT AR
2026-08-18 501-488-3XXX 3000–3999Assigned E. RITTER COMMUNICATIONS, LLC 128L BRADFORD AR
2026-08-18 501-582-8XXX 8000–8999Assigned E. RITTER COMMUNICATIONS, LLC 128L BENTON AR
2025-12-15 501-587-1XXX 1000–1999Assigned E. RITTER COMMUNICATIONS, LLC 128L LITTLEROCK AR
2024-11-07 501-521-3XXX 3000–3999Assigned E. RITTER COMMUNICATIONS, LLC 128L HOTSPRINGS AR
2022-12-21 501-496-1XXX 1000–1999Assigned E. RITTER COMMUNICATIONS, LLC 128L REDFIELD AR
2022-05-24 501-600-5XXX 5000–5999Assigned E. RITTER COMMUNICATIONS, LLC 128L PLEASANTPL AR
2021-10-01 501-402-1XXX 1000–1999Assigned E. RITTER COMMUNICATIONS, LLC 128L GREENBRIER AR
2021-10-01 501-808-0XXX 0000–0999Assigned E. RITTER COMMUNICATIONS, LLC 128L VILONIA AR
2021-05-20 501-453-5XXX 5000–5999Assigned E. RITTER COMMUNICATIONS, LLC 128L JACKSONVL AR
2021-05-20 501-453-6XXX 6000–6999Assigned E. RITTER COMMUNICATIONS, LLC 128L JACKSONVL AR
2020-08-17 501-292-7XXX 7000–7999Assigned E. RITTER COMMUNICATIONS, LLC 128L BALD KNOB AR
2020-05-14 501-510-2XXX 2000–2999Assigned E. RITTER COMMUNICATIONS, LLC 128L LONOKE AR
2020-03-18 501-477-4XXX 4000–4999Assigned E. RITTER COMMUNICATIONS, LLC 128L MORRILTON AR
2019-10-14 501-359-4XXX 4000–4999Assigned E. RITTER COMMUNICATIONS, LLC 128L HOTSPRINGS AR
2019-02-26 501-359-3XXX 3000–3999Assigned E. RITTER COMMUNICATIONS, LLC 128L HOTSPRINGS AR
2019-02-26 501-601-1XXX 1000–1999Assigned E. RITTER COMMUNICATIONS, LLC 128L MALVERN AR
2018-10-04 501-429-0XXX 0000–0999Assigned E. RITTER COMMUNICATIONS, LLC 128L HEBER SPG AR
2018-10-02 501-534-0XXX 0000–0999Assigned E. RITTER COMMUNICATIONS, LLC 128L LITTLEROCK AR
2018-10-02 501-534-1XXX 1000–1999Assigned E. RITTER COMMUNICATIONS, LLC 128L LITTLEROCK AR
2017-11-14 501-214-2XXX 2000–2999Assigned E. RITTER COMMUNICATIONS, LLC 128L LITTLEROCK AR
2017-10-25 501-236-0XXX 0000–0999Assigned E. RITTER COMMUNICATIONS, LLC 128L SEARCY AR
2017-03-16 501-858-0XXX 0000–0999Assigned E. RITTER COMMUNICATIONS, LLC 128L BEEBE AR
2016-07-26 501-406-9XXX 9000–9999Assigned E. RITTER COMMUNICATIONS, LLC 128L LITTLEROCK AR
2016-07-26 501-585-9XXX 9000–9999Assigned E. RITTER COMMUNICATIONS, LLC 128L CONWAY AR
2016-01-27 501-596-9XXX 9000–9999Assigned E. RITTER COMMUNICATIONS, LLC 128L JACKSONVL AR
2015-08-11 501-422-6XXX 6000–6999Assigned E. RITTER COMMUNICATIONS, LLC 128L CABOT AR
2012-12-05 501-203-0XXX 0000–0999Assigned E. RITTER COMMUNICATIONS, LLC 128L SEARCY AR

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.