Dutch_OsintGuy
@dutchosintguy.bsky.social
Dutch guy with Open Source Intelligence & Analysis skills • OSINT • Certified Instructor @SANSInstitute • SVP of Engineering& Chief Innovator @ shadowdragon.io
🚨New blog:
A city is not a word.
It’s a language system.
When people say “020,” “Mokum,” or “Freedom City,”
they’re still talking about Amsterdam
just not in a way your #OSINT investigation understands.
Imagine how many you’re missing.
Read the blog here: www.dutchosintguy.com/post/how-osi...
A city is not a word.
It’s a language system.
When people say “020,” “Mokum,” or “Freedom City,”
they’re still talking about Amsterdam
just not in a way your #OSINT investigation understands.
Imagine how many you’re missing.
Read the blog here: www.dutchosintguy.com/post/how-osi...
OSINT - Cities with hundreds of names | How OSINT investigators miss hidden clues
You think you know Amsterdam? You don’t. Even if you’re born and raised there. For OSINT investigators, analysts, and journalists, searching only for “Amsterdam” means missing half the signal. The cit...
www.dutchosintguy.com
January 2, 2026 at 8:22 AM
🚨New blog:
A city is not a word.
It’s a language system.
When people say “020,” “Mokum,” or “Freedom City,”
they’re still talking about Amsterdam
just not in a way your #OSINT investigation understands.
Imagine how many you’re missing.
Read the blog here: www.dutchosintguy.com/post/how-osi...
A city is not a word.
It’s a language system.
When people say “020,” “Mokum,” or “Freedom City,”
they’re still talking about Amsterdam
just not in a way your #OSINT investigation understands.
Imagine how many you’re missing.
Read the blog here: www.dutchosintguy.com/post/how-osi...
🧵 1/14
2025 wasn’t a writing exercise for me.
It was a warning.
Across every blog I wrote this year, one pattern kept repeating:
OSINT doesn’t fail because we lack data, tools, or AI.
It fails when we stop thinking.
2025 wasn’t a writing exercise for me.
It was a warning.
Across every blog I wrote this year, one pattern kept repeating:
OSINT doesn’t fail because we lack data, tools, or AI.
It fails when we stop thinking.
December 22, 2025 at 1:32 PM
🧵 1/14
2025 wasn’t a writing exercise for me.
It was a warning.
Across every blog I wrote this year, one pattern kept repeating:
OSINT doesn’t fail because we lack data, tools, or AI.
It fails when we stop thinking.
2025 wasn’t a writing exercise for me.
It was a warning.
Across every blog I wrote this year, one pattern kept repeating:
OSINT doesn’t fail because we lack data, tools, or AI.
It fails when we stop thinking.
One more companion blog for the one below. Because it is such an important topic :
www.dutchosintguy.com/post/the-kid...
www.dutchosintguy.com/post/the-kid...
December 8, 2025 at 10:49 AM
One more companion blog for the one below. Because it is such an important topic :
www.dutchosintguy.com/post/the-kid...
www.dutchosintguy.com/post/the-kid...
New Blog: This will be my last blog of 2025. And since we are close to the Xmas holidays kids will probably spend hours scrolling on their phones.
Read the blog here : THE ALGORITHMIC ANXIETY MACHINE | You can expose the social media algorithm dangers with OSINT www.dutchosintguy.com/post/the-alg...
Read the blog here : THE ALGORITHMIC ANXIETY MACHINE | You can expose the social media algorithm dangers with OSINT www.dutchosintguy.com/post/the-alg...
THE ALGORITHMIC ANXIETY MACHINE | You can expose the social media algorithm dangers with OSINT
If you want to know why teens feel broken, watch a fresh account for thirty minutes. It starts with jokes and ends in panic attacks, body shame, and self-diagnosis. Kids aren’t searching for this. The...
www.dutchosintguy.com
December 1, 2025 at 8:38 AM
New Blog: This will be my last blog of 2025. And since we are close to the Xmas holidays kids will probably spend hours scrolling on their phones.
Read the blog here : THE ALGORITHMIC ANXIETY MACHINE | You can expose the social media algorithm dangers with OSINT www.dutchosintguy.com/post/the-alg...
Read the blog here : THE ALGORITHMIC ANXIETY MACHINE | You can expose the social media algorithm dangers with OSINT www.dutchosintguy.com/post/the-alg...
#HUMINT is human truth.
#OSINT is digital truth.
Neither makes sense without the other.
I wrote about this in my latest blog. What I’ve seen work, what I’ve seen fail, and why intelligence today is never one discipline alone. www.dutchosintguy.com/post/when-hu...
#OSINT is digital truth.
Neither makes sense without the other.
I wrote about this in my latest blog. What I’ve seen work, what I’ve seen fail, and why intelligence today is never one discipline alone. www.dutchosintguy.com/post/when-hu...
When HUMINT Forgot the Internet: Why Human Intelligence Needs OSINT More Than Ever
Human intelligence is powerful, but incomplete without digital validation. Based on real-world investigations, this blog explores why HUMINT operators, law enforcement, and intelligence agencies must ...
www.dutchosintguy.com
November 24, 2025 at 1:47 PM
#HUMINT is human truth.
#OSINT is digital truth.
Neither makes sense without the other.
I wrote about this in my latest blog. What I’ve seen work, what I’ve seen fail, and why intelligence today is never one discipline alone. www.dutchosintguy.com/post/when-hu...
#OSINT is digital truth.
Neither makes sense without the other.
I wrote about this in my latest blog. What I’ve seen work, what I’ve seen fail, and why intelligence today is never one discipline alone. www.dutchosintguy.com/post/when-hu...
This is why I love working for @ShadowDragonIO. We build #OSINT capabilities that help uncover real world criminals.
This use case started with one FBI Most wanted page: www.fbi.gov/wanted/cyber...
Park Jin HYOK is wanted by the FBI for his role as a hacker for #DPRK.
1/3
This use case started with one FBI Most wanted page: www.fbi.gov/wanted/cyber...
Park Jin HYOK is wanted by the FBI for his role as a hacker for #DPRK.
1/3
November 20, 2025 at 1:30 PM
This is why I love working for @ShadowDragonIO. We build #OSINT capabilities that help uncover real world criminals.
This use case started with one FBI Most wanted page: www.fbi.gov/wanted/cyber...
Park Jin HYOK is wanted by the FBI for his role as a hacker for #DPRK.
1/3
This use case started with one FBI Most wanted page: www.fbi.gov/wanted/cyber...
Park Jin HYOK is wanted by the FBI for his role as a hacker for #DPRK.
1/3
New blog: Discover the art of report writing in #OSINT. Learn how effective report writing transforms data into actionable insights.
Read the blog here: www.dutchosintguy.com/post/osint-a...
Read the blog here: www.dutchosintguy.com/post/osint-a...
OSINT Analysis Intelligence Reporting: Mastering Report Writing Skills
Intelligence reports turn raw OSINT data into actionable insight. After two decades in the field, one lesson stands out: collection means nothing without clear communication. The real value lies in an...
www.dutchosintguy.com
November 17, 2025 at 8:04 AM
New blog: Discover the art of report writing in #OSINT. Learn how effective report writing transforms data into actionable insights.
Read the blog here: www.dutchosintguy.com/post/osint-a...
Read the blog here: www.dutchosintguy.com/post/osint-a...
New Blog:
Fatigue is the invisible corruption of intelligence work.
It dulls intuition, erodes skepticism, and makes analysts trust tools more than their own reasoning.
#OSINT doesn’t fail when data runs out.
It fails when curiosity does.
Read: www.dutchosintguy.com/post/black-s...
Fatigue is the invisible corruption of intelligence work.
It dulls intuition, erodes skepticism, and makes analysts trust tools more than their own reasoning.
#OSINT doesn’t fail when data runs out.
It fails when curiosity does.
Read: www.dutchosintguy.com/post/black-s...
November 4, 2025 at 10:47 AM
New Blog:
Fatigue is the invisible corruption of intelligence work.
It dulls intuition, erodes skepticism, and makes analysts trust tools more than their own reasoning.
#OSINT doesn’t fail when data runs out.
It fails when curiosity does.
Read: www.dutchosintguy.com/post/black-s...
Fatigue is the invisible corruption of intelligence work.
It dulls intuition, erodes skepticism, and makes analysts trust tools more than their own reasoning.
#OSINT doesn’t fail when data runs out.
It fails when curiosity does.
Read: www.dutchosintguy.com/post/black-s...
Tip: Space #OSINT ✨🛰️📡 KeepTrack Space is a free, open-source web tool for visualizing and analysing objects in Earth orbit (satellites, debris, launches & more) app.keeptrack.space
October 20, 2025 at 7:32 AM
Tip: Space #OSINT ✨🛰️📡 KeepTrack Space is a free, open-source web tool for visualizing and analysing objects in Earth orbit (satellites, debris, launches & more) app.keeptrack.space
New blog: Beyond Dashboards: OSINT’s Next Two Decades
Explore the future of OSINT with AI as I (try to) delve into the next two decades of advancements. Discover how OSINT and AI will redefine tradecraft.
www.dutchosintguy.com/post/beyond-...
#OSINT #AI #Tradecraft #future
Explore the future of OSINT with AI as I (try to) delve into the next two decades of advancements. Discover how OSINT and AI will redefine tradecraft.
www.dutchosintguy.com/post/beyond-...
#OSINT #AI #Tradecraft #future
September 29, 2025 at 9:52 AM
New blog: Beyond Dashboards: OSINT’s Next Two Decades
Explore the future of OSINT with AI as I (try to) delve into the next two decades of advancements. Discover how OSINT and AI will redefine tradecraft.
www.dutchosintguy.com/post/beyond-...
#OSINT #AI #Tradecraft #future
Explore the future of OSINT with AI as I (try to) delve into the next two decades of advancements. Discover how OSINT and AI will redefine tradecraft.
www.dutchosintguy.com/post/beyond-...
#OSINT #AI #Tradecraft #future
Some people online are claiming that #Kirk was shot up close by a man standing next/close to him.
This is not true.
After the impact you can clearly see his right hand is empty, NO GUN. #OSINT #CharlieKirk
This is not true.
After the impact you can clearly see his right hand is empty, NO GUN. #OSINT #CharlieKirk
September 11, 2025 at 9:46 AM
Some people online are claiming that #Kirk was shot up close by a man standing next/close to him.
This is not true.
After the impact you can clearly see his right hand is empty, NO GUN. #OSINT #CharlieKirk
This is not true.
After the impact you can clearly see his right hand is empty, NO GUN. #OSINT #CharlieKirk
Morning coffee, skimming the news. This article about the arrest of a serial killer caught my attention : nypost.com/2025/09/08/u...
Decided to use our #OSINT enterprise solution @shadowdragonio.bsky.social to see if I could learn about the suspect. Couple of minutes I was able to uncover A LOT !
Decided to use our #OSINT enterprise solution @shadowdragonio.bsky.social to see if I could learn about the suspect. Couple of minutes I was able to uncover A LOT !
September 10, 2025 at 9:56 AM
Morning coffee, skimming the news. This article about the arrest of a serial killer caught my attention : nypost.com/2025/09/08/u...
Decided to use our #OSINT enterprise solution @shadowdragonio.bsky.social to see if I could learn about the suspect. Couple of minutes I was able to uncover A LOT !
Decided to use our #OSINT enterprise solution @shadowdragonio.bsky.social to see if I could learn about the suspect. Couple of minutes I was able to uncover A LOT !
New Blog: Discover how graffiti serves as modern hieroglyphics in #OSINT. Explore graffiti's role in gang communication and territorial markers today.
www.dutchosintguy.com/post/osint-r...
www.dutchosintguy.com/post/osint-r...
September 5, 2025 at 9:21 AM
New Blog: Discover how graffiti serves as modern hieroglyphics in #OSINT. Explore graffiti's role in gang communication and territorial markers today.
www.dutchosintguy.com/post/osint-r...
www.dutchosintguy.com/post/osint-r...
ICYMI ⬇️
New Blog: Most people doing #OSINT aren’t doing OSINT.
They’re just Googling with extra steps, screenshotting dashboards, and calling it “intelligence.”
That’s not tradecraft. That’s cosplay.
Let’s talk about what OSINT is not: www.dutchosintguy.com/post/stop-ca...
They’re just Googling with extra steps, screenshotting dashboards, and calling it “intelligence.”
That’s not tradecraft. That’s cosplay.
Let’s talk about what OSINT is not: www.dutchosintguy.com/post/stop-ca...
August 30, 2025 at 8:09 AM
ICYMI ⬇️
New Blog: Most people doing #OSINT aren’t doing OSINT.
They’re just Googling with extra steps, screenshotting dashboards, and calling it “intelligence.”
That’s not tradecraft. That’s cosplay.
Let’s talk about what OSINT is not: www.dutchosintguy.com/post/stop-ca...
They’re just Googling with extra steps, screenshotting dashboards, and calling it “intelligence.”
That’s not tradecraft. That’s cosplay.
Let’s talk about what OSINT is not: www.dutchosintguy.com/post/stop-ca...
August 22, 2025 at 9:41 AM
New Blog: Most people doing #OSINT aren’t doing OSINT.
They’re just Googling with extra steps, screenshotting dashboards, and calling it “intelligence.”
That’s not tradecraft. That’s cosplay.
Let’s talk about what OSINT is not: www.dutchosintguy.com/post/stop-ca...
They’re just Googling with extra steps, screenshotting dashboards, and calling it “intelligence.”
That’s not tradecraft. That’s cosplay.
Let’s talk about what OSINT is not: www.dutchosintguy.com/post/stop-ca...
Cooking up a new sun and moon shadow-cast calculator for #OSINT investigations. Looking for input for (advanced) features.... anyone? See screenshots of work in progress:
August 18, 2025 at 2:27 PM
Cooking up a new sun and moon shadow-cast calculator for #OSINT investigations. Looking for input for (advanced) features.... anyone? See screenshots of work in progress:
ICYMI: Authentic8 recently invited me on their Needle Stack podcast. We had a great conversation about #OSINT, tradecraft, #AI and more. You can watch/listen here: www.youtube.com/watch?v=BiWU...
Intelligence tradecraft in the digital age | E87
YouTube video by Authentic8
www.youtube.com
August 14, 2025 at 8:34 AM
ICYMI: Authentic8 recently invited me on their Needle Stack podcast. We had a great conversation about #OSINT, tradecraft, #AI and more. You can watch/listen here: www.youtube.com/watch?v=BiWU...
Recently a lot of #AI / #LLM models like #ChatGPT 5 #GROK #Claude got updates but after thourough testing my blog is still accurate: shadowdragon.io/blog/the-slo...
#OSINT #Intelligence
#OSINT #Intelligence
August 10, 2025 at 9:19 AM
Recently a lot of #AI / #LLM models like #ChatGPT 5 #GROK #Claude got updates but after thourough testing my blog is still accurate: shadowdragon.io/blog/the-slo...
#OSINT #Intelligence
#OSINT #Intelligence
Tip: Recently I was investigating an old cold case and an old newspaper gave me the breakthrough that helped solved the case. Use newspaperarchive.com (paid) or news.google.com/newspapers (free) for local newspaper #OSINT.
Perfect for verifying people, crimes, or old business data.
Perfect for verifying people, crimes, or old business data.
NewspaperArchive 1700s - 2025 | NewspaperArchive
Search through 16,491 historic newspaper archives to do genealogy and family history. Find obituaries, marriage and birth announcements, and other local and national news for over 9.3 billion people!
newspaperarchive.com
July 6, 2025 at 5:57 PM
Tip: Recently I was investigating an old cold case and an old newspaper gave me the breakthrough that helped solved the case. Use newspaperarchive.com (paid) or news.google.com/newspapers (free) for local newspaper #OSINT.
Perfect for verifying people, crimes, or old business data.
Perfect for verifying people, crimes, or old business data.
Great read!
It all started with a Twitter account, some ChatGPT quotes, and someone looking for a good time. This is the breakdown of how a guy convinced Rolling Stone he was the rep for a suddenly popular AI band, Velvet Sundown.
www.bullshithunting.com/p/a-free-osi...
www.bullshithunting.com/p/a-free-osi...
A Free OSINT Lesson: The "Velvet Sundown" Squatter Who Duped the News Media
Andrew Frelon: A fake band manager pretending to manage a band that doesn't exist. How Avant-garde.
www.bullshithunting.com
July 3, 2025 at 4:14 PM
Great read!
Showcasing the power #OSINT with @shadowdragonio.bsky.social Horizon. Recently a suspect was arrested who has been identified as being the person behind "Intelbroker". 1/2
June 26, 2025 at 8:10 AM
Showcasing the power #OSINT with @shadowdragonio.bsky.social Horizon. Recently a suspect was arrested who has been identified as being the person behind "Intelbroker". 1/2
Quick Note for Media:
I’m grateful for the interest DM’s, emails, calls, but I’m not available for comments on #OSINT findings related to conflict zones or war incidents. If I uncover anything important, I’ll share it with the proper authorities — not publicly. Thanks for understanding.
I’m grateful for the interest DM’s, emails, calls, but I’m not available for comments on #OSINT findings related to conflict zones or war incidents. If I uncover anything important, I’ll share it with the proper authorities — not publicly. Thanks for understanding.
June 22, 2025 at 3:09 PM
Quick Note for Media:
I’m grateful for the interest DM’s, emails, calls, but I’m not available for comments on #OSINT findings related to conflict zones or war incidents. If I uncover anything important, I’ll share it with the proper authorities — not publicly. Thanks for understanding.
I’m grateful for the interest DM’s, emails, calls, but I’m not available for comments on #OSINT findings related to conflict zones or war incidents. If I uncover anything important, I’ll share it with the proper authorities — not publicly. Thanks for understanding.
Had a great week teaching the 6 day SANS Institute SEC497 #OSINT course. The teams performed extremely well during the final CTF and one was the clear winner of the challenge coin.
June 21, 2025 at 12:29 PM
Had a great week teaching the 6 day SANS Institute SEC497 #OSINT course. The teams performed extremely well during the final CTF and one was the clear winner of the challenge coin.
At ShadowDragon we listen to our customers. This is why we have built Horizon Identity.
• Simplifies complex identity investigations
• Uncovers connections that manual #OSINT can miss
• No scraping, no guesswork—just clarity
Ask for a demo or learn more here: shadowdragon.io/horizon-iden...
• Simplifies complex identity investigations
• Uncovers connections that manual #OSINT can miss
• No scraping, no guesswork—just clarity
Ask for a demo or learn more here: shadowdragon.io/horizon-iden...
June 9, 2025 at 9:44 AM
At ShadowDragon we listen to our customers. This is why we have built Horizon Identity.
• Simplifies complex identity investigations
• Uncovers connections that manual #OSINT can miss
• No scraping, no guesswork—just clarity
Ask for a demo or learn more here: shadowdragon.io/horizon-iden...
• Simplifies complex identity investigations
• Uncovers connections that manual #OSINT can miss
• No scraping, no guesswork—just clarity
Ask for a demo or learn more here: shadowdragon.io/horizon-iden...