r/blueteamsec↗
For [Blue|Purple] Teams in Cyber Defence
We focus on technical intelligence, research and engineering to help operational [blue|purple] teams defend their estates and have awareness of the world. Our primary home is on Lemmy after the great ban debacle of 2025.
73k subscribers564 posts / mo in Sep 2026110 authors / mosince 2018
r/blueteamsec has 73k members (+24% over the last 12 months). It gets about 564 posts a month from 110 people. Top topics: Malware Discussions, Ransomware Attacks & Threats and Windows Security Exploits.
When to post on r/blueteamsec
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How r/blueteamsec has grown
Subscriber growth
Subscribers over time
Monthly activity
Posts, comments and authors per month
Topics and brands on r/blueteamsec
Top topics
Share of the subreddit's posts
- Malware Discussions3.2%
- Ransomware Attacks & Threats2.9%
- Windows Security Exploits2.6%
- Linux Security Vulnerabilities1.9%
- Malware Security1.0%
Brands people mention
Most-mentioned brands and sites, last 12 months
- Medium
- Microsoft
- Substack
- arXiv.org e-Print archive
- 腾讯网
Everything else about r/blueteamsec
Posting rules and account requirements, how often posts get removed, who writes here (age, gender, countries), what people ask for, how they talk, and related subreddits — all in the full report.
Posts and activity for Sep 2026. Members from Reddit's subscriber counts. Read from the same data the app runs on. Our research