What DEF CON Edition Was Held in 2017
DEF CON 25 was the edition that took place in 2017. DEF CON is an annual hacker conference that has run each summer since 1993, with editions numbered sequentially starting at one for the first event. DEF CON 25 was held in August 2017 in Las Vegas, Nevada. The numbering reflects cumulative years of the conference, not a cycle or version reset, so "DEF CON 25" simply means the 25th annual event.
How DEF CON Numbering Works
DEF CON numbering is straightforward and linear:
- Started at DEF CON 1 in 1993
- Incremented by one each year
- Runs in summer (typically August)
- No resets, skips, or thematic versioning
If you know the edition number, you can roughly infer the year by subtracting 24 from the edition number for 1993 as the base. In practice, checking the year against the edition in a table is fastest.
DEF CON Editions Reference Table
| DEF CON Edition | Calendar Year | Typical Month | Location (Typical) |
|---|---|---|---|
| DEF CON 23 | 2015 | August | Las Vegas, NV |
| DEF CON 24 | 2016 | August | Las Vegas, NV |
| DEF CON 25 | 2017 | August | Las Vegas, NV |
| DEF CON 26 | 2018 | August | Las Vegas, NV |
| DEF CON 27 | 2019 | August | Las Vegas, NV |
DEF CON 25 Key Details
DEF CON 25 in 2017 followed the long-standing pattern of the event: multi-day briefings, trainings, villages, lockpicking, and traditional DEF CTF. The conference continues to attract a global mix of researchers, industry, journalists, and enthusiasts. Notably, DEF CON 25 included talks on then-emerging topics such as IoT security and practical attacks on wireless protocols, reflecting the evolving threat landscape at the time.
Why Edition Numbers Matter
The edition number signals the maturity and lineage of the conference. Higher edition numbers indicate longer histories, established village programs, and larger attendee pools. DEF CON has never skipped a year or restarted its count, so the edition is a reliable proxy for the event’s cumulative experience and community continuity.
Common Misconceptions
Some assume DEF CON editions reset periodically or follow a marketing version scheme. In reality, DEF CON numbering is cumulative. Other conferences sometimes reboot editions for branding, but DEF CON maintains a single, unbroken sequence from 1 onward. This consistency helps attendees and researchers reference past materials, tools, and research tied to specific editions.
Relation to Other DEF CON Events
DEF CON remains the flagship annual conference. Other related activities such as village meetups, training pre-cons, and CTF events typically align with the main conference number and year. For example, DEF CON 25 villages and training happened alongside the main event in 2017. Understanding the edition helps you correlate talks, tools, and write-ups published for that year.
Takeaway
In 2017, the active DEF CON edition was DEF CON 25, held in August in Las Vegas. The numbering is linear and cumulative, with DEF CON 1 occurring in 1993. If you are referencing materials, videos, or research from DEF CON 25, they originate from the 2017 conference cycle. This numbering clarity supports better archival searches, tool versioning, and historical context for the community.