r/mainframe↗
Mainframe computing - where uptime is measured in years
Discussion of all things Mainframe - hardware & software, programming & support.
12k subscribers43 posts / mo in Sep 202633 authors / mosince 2010
r/mainframe has 12k members (+23% over the last 12 months). It gets about 43 posts a month from 33 people. Top topics: ZFS & Proxmox Storage, Vintage Computers and IBM Legacy PCs & Keyboards.
When to post on r/mainframe
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How r/mainframe has grown
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Topics and brands on r/mainframe
Top topics
Share of the subreddit's posts
- ZFS & Proxmox Storage1.8%
- Vintage Computers0.7%
- IBM Legacy PCs & Keyboards0.6%
- DevOps & SRE Navigation0.5%
- IBM Cloud Jobs and Legal Issues0.5%
Brands people mention
Most-mentioned brands and sites, last 12 months
Posting rules for r/mainframe
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What works on r/mainframe
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Who posts on r/mainframe
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See all of r/mainframe
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research