NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

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 317
LEVEL 3 COMMUNICATIONS, LLC - IN 220
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
2024-04-15 317-369-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MAXWELL IN
2021-10-25 317-589-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MCCORDSVL IN
2020-01-31 317-768-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WHITESTOWN IN
2018-04-06 317-505-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FORTVILLE IN
2018-04-06 317-505-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FORTVILLE IN
2018-04-06 317-505-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FORTVILLE IN
2018-04-06 317-505-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FORTVILLE IN
2018-04-06 317-505-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FORTVILLE IN
2017-10-18 317-740-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 CARMEL IN
2017-06-28 317-648-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 TRAFALGAR IN
2017-06-28 317-933-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 NINEVEH IN
2017-05-31 317-419-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2017-01-04 317-734-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2016-07-12 317-469-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2016-02-18 317-556-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2015-12-18 317-768-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WHITESTOWN IN
2015-07-29 317-744-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2015-07-29 317-744-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2015-07-17 317-960-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2015-05-12 317-982-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2015-05-12 317-982-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2015-04-02 317-981-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2015-04-02 317-981-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2015-03-18 317-790-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-11-11 317-983-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-11-11 317-983-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-09-29 317-231-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-09-29 317-793-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-09-11 317-660-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 CARMEL IN
2014-07-11 317-991-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-06-19 317-729-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 MARIETTA IN
2014-06-13 317-991-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-05-30 317-458-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 BARGERSVL IN
2014-05-30 317-530-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WHITELAND IN
2014-05-23 317-754-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 PLAINFIELD IN
2014-04-16 317-973-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ZIONSVILLE IN
2014-04-16 317-986-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-03-26 317-884-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 GREENWOOD IN
2014-02-27 317-668-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FRANKLIN IN
2014-02-06 317-671-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2014-02-06 317-671-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2013-12-11 317-672-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2013-12-11 317-672-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2013-12-03 317-576-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 FISHERS IN
2013-10-24 317-565-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 NOBLESVL IN
2013-06-21 317-653-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2013-06-21 317-653-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2013-06-21 317-653-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN
2013-05-24 317-218-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 CARMEL IN
2013-03-28 317-662-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - IN 4803 INDIANAPLS IN

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.