About r/cybersecurity
In its own words:
This subreddit is for technical professionals to discuss cybersecurity news, research, threats, etc.
Community guide
r/cybersecurity (#680, about 1.6 million subscribers) is oriented around: This subreddit is for technical professionals to discuss cybersecurity news, research, threats, etc. Recent activity samples show ~80 posts/day in recent samples (~77% text, ~22% link, ~1% video). Public rules we collected include: Read the FAQ before posting; Must be relevant to cybersecurity professionals; No low effort / poor quality posts; Security first / no editorializing; No advertising.
What belongs here
Stay inside the room’s stated scope rather than adjacent off-topic dumps. Self-promotion and ads are limited—read those rules before linking your own work. Low-effort memes/empty shitposts are often removed—add real context.
How it differs from lookalikes
Prefer this room when your post matches its description and rule list—not merely a larger sibling community. The public rule list is long enough that skimming all entries once beats assuming defaults from similar subs.
Practical pointers
Read the live sidebar/rules before posting; collected snapshots can lag. Common flairs in samples include: News - General, Business Security Questions & Discussion, Career Questions & Discussion, Personal Support & Help!.
SubMouse Editorial
The community was created on May 22, 2012, which makes it 14 years old. Since Oct 26, 2026, it has gained 6,282 subscribers (+0.41%). Among the 7 communities on our cybersecurity list it is the largest. It sits just behind r/StartledCats (#679) and ahead of r/Aquariums (#681) in our ranking.
What sets r/cybersecurity apart
Compared with other large communities, r/cybersecurity leans heavily on text posts (77% of recent posts; the typical Top 100 subreddit sits at 35%). For its size it is unusually busy: about 51.4 new posts a day per million members, more than 88% of the Top 100. It is also one of the faster-growing big communities: its 1.96% gain since Sep 19, 2026 beats 99% of the Top 100.
Subscriber growth
Between Sep 19, 2026 and Nov 2, 2026, r/cybersecurity climbed from 1,525,662 to 1,555,635 subscribers (+30K, +1.96%). That is about 681 new members per day. The chart uses our weekly snapshots (9 so far), so it gets longer every week.
What r/cybersecurity talks about
We read the titles of 534 recent posts (Oct 29–Nov 5), the words that come up most are “security”, “attack”, “binance”, “cyber” and “job”. Other frequent themes are help, advice, google, vulnerability, built and looking. Recurring phrases include “pass-ta-key golden”, “golden attack”, “google password” and “password manager”. By format, 77% are text posts, 22% are links and 1% are videos.
Popular post flairs: News - General (87), Business Security Questions & Discussion (86), Career Questions & Discussion (76), Personal Support & Help! (54), Other (43), AI Security (27).
Activity and best time to post
r/cybersecurity gets roughly 80 new posts a day. The public archive holds 246,534 posts and 1,643,726 comments in total, about 6.7 comments per post.
Rules of r/cybersecurity
The moderators of r/cybersecurity list 9 rules. In short:
- Read the FAQ before posting
- Must be relevant to cybersecurity professionals
- No low effort / poor quality posts
- Security first / no editorializing
- No advertising
- No excessive promotion
- No personally-identifiable information.
- Civility
- Ongoing security incidents are to be collated into one thread
How to join
Open reddit.com/r/cybersecurity and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How many members does r/cybersecurity have?
r/cybersecurity has 1,555,635 subscribers (Nov 2, 2026), which makes it the #680 safe-for-work subreddit in the SubMouse ranking. It added 29,973 members between Sep 19, 2026 and Nov 2, 2026.
When was r/cybersecurity created?
r/cybersecurity was created on May 22, 2012, so it has been around for 14 years. The oldest post in the public archive is from Jun 20, 2012.
Is r/cybersecurity still active?
Yes. r/cybersecurity gets roughly 80 new posts a day (estimate from a sample of recent posts). Over its lifetime the archive counts 246,534 posts and 1,643,726 comments. In a sample of 534 recent posts we counted 465 different authors.
What kind of posts are on r/cybersecurity?
The community describes itself as: “This subreddit is for technical professionals to discuss cybersecurity news, research, threats, etc.” Recent post titles often mention security, attack, binance, cyber and job. Most posts are text posts (77%).
Is r/cybersecurity SFW?
Yes. Reddit does not mark r/cybersecurity as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
What are the rules of r/cybersecurity?
Join the community on Reddit first, then use “Create post”. r/cybersecurity accepts both text and link posts, with polls enabled. It has 9 posted rules, starting with: “Read the FAQ before posting”; “Must be relevant to cybersecurity professionals”; “No low effort / poor quality posts”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
What subreddits are similar to r/cybersecurity?
Communities with similar topics include r/CryptoTechnology (1.3M), r/Android (3.2M), r/SquaredCircle (1.4M), r/science (34.6M) and r/OpenAI (2.9M).
Stats from public data (data updated Nov 2, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/cybersecurity.