How the cybersecurity communities compare
A few giants dominate — r/cybersecurity, r/netsec and r/AskNetsec together account for 90% of the combined membership. r/cybersecurity is both the biggest and the busiest, with about 91 new posts a day. Per member, the liveliest is r/CyberSecurityJobs: 8.3 posts a day from 38.2K members — a smaller crowd, but an engaged one. The oldest is r/netsec, founded in 2007, and only one community here is younger than five years: r/cybersecurity_help (2021).
The 7 biggest cybersecurity subreddits
- Cr/cybersecurity ↗ 1,552,487 members · ~91 posts/day · +11.9K since Oct 26 · since 2012
This subreddit is for technical professionals to discuss cybersecurity news, research, threats, etc.
- Nr/netsec ↗ 517,188 members · ~11 posts/day · since 2007
/r/netsec is a community-curated aggregator of technical information security content. Our mission is to extract signal from the noise — to provide value to security practitioners, students, researchers, and hackers everywhere.
- Ar/AskNetsec ↗ 216,558 members · ~5.7 posts/day · since 2011
Dedicated to those passionate about security.
- Nr/netsecstudents ↗ 131,793 members · ~3.0 posts/day · since 2013
A place to share resources, ask questions, and help other students learn Network Security specialties of all kinds. Please read the rules before posting: https://www.reddit.com/r/netsecstudents/about/rules/
- Cr/CyberSecurityAdvice ↗ 62,374 members · since 2017
For advice and tips on cybersecurity. Not just for knowledgeable IT guys, we're here to help everyone!
- Cr/CyberSecurityJobs ↗ 38,229 members · ~8.3 posts/day · since 2016
A forum for discussing cybersecurity career information.
- Cr/cybersecurity_help ↗ 35,566 members · since 2021
This subreddit is r/techsupport but focused on solving individuals' cybersecurity concerns, removing malware, and more. Please be sure to follow the posting guide for accurate and helpful answers.
Choosing where to post
If you have a question, start in r/AskNetsec: it is set up for exactly that, and with about 5.7 new posts a day there are plenty of people around to answer. Asking the same thing in r/cybersecurity often gets it removed or lost among the 91 daily posts. Competition for attention differs a lot: r/netsec has 517.2K members but only about 11 new posts a day — roughly one new post for every 46.6K members — while r/cybersecurity gets about 91 a day, one for every 17.1K. A strong, well-made post therefore has more room to be seen in r/netsec; r/cybersecurity is better when you want quick replies.
Before posting, sort a subreddit by “Top” for the past month: it shows in a minute what that community rewards. Always read the rules in the sidebar first — each community is run by its own volunteer moderators. Our guide to searching Reddit explains how to dig through any of these communities, and the subreddit info tool gives you the stats of one we don't list.
Frequently asked questions
What is the biggest cybersecurity subreddit?
r/cybersecurity is the largest, with 1,552,487 members, followed by r/netsec (517.2K) and r/AskNetsec (216.6K).
Which cybersecurity subreddit is the most active?
By new posts per day, r/cybersecurity leads with about 91, ahead of r/netsec (11). Counts are averages over the last seven days.
Where should a beginner ask about cybersecurity on Reddit?
r/AskNetsec is the one built around questions and advice, with about 5.7 new posts a day. Check its rules and search it first — common questions have usually been answered.
How many cybersecurity subreddits are there?
We list 7 active, safe-for-work cybersecurity communities with at least 25,000 members each, 2.6M members in total (people can be in several). Reddit has many smaller ones too; our guide on searching Reddit shows how to find them.
What is the oldest cybersecurity subreddit?
r/netsec, created on May 18, 2007.
Are these cybersecurity subreddits safe for work?
Yes. Every community on this page is public and not marked 18+ by Reddit, and we filter out communities whose name or description points to adult content.
Data: Reddit's public subreddit search and the Arctic Shift archive (Nov 6, 2026), growth from SubMouse's weekly snapshots. Member counts of communities outside our Top 1000 come from the archive and can lag a little. Not affiliated with Reddit.