NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
AIRUS, INC. - AR 14
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
2023-03-31 501-480-0XXX 0000–0999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2021-09-24 501-910-1XXX 1000–1999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2021-05-04 501-737-5XXX 5000–5999Assigned AIRUS, INC. - AR 578H SCOTT AR
2021-05-03 501-451-0XXX 0000–0999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2021-01-29 501-961-8XXX 8000–8999Assigned AIRUS, INC. - AR 578H SCOTT AR
2021-01-27 501-441-0XXX 0000–0999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2020-03-20 501-369-0XXX 0000–0999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2019-10-08 501-274-0XXX 0000–0999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2019-08-05 501-263-9XXX 9000–9999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2019-06-11 501-737-9XXX 9000–9999Assigned AIRUS, INC. - AR 578H SCOTT AR
2019-02-04 501-263-8XXX 8000–8999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2018-08-29 501-263-1XXX 1000–1999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2018-07-26 501-260-1XXX 1000–1999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR
2015-09-21 501-406-1XXX 1000–1999Assigned AIRUS, INC. - AR 578H LITTLEROCK AR

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.