[technonerd]

>He right-clicked on the page and chose “View page source” from the resulting menu.

>...

>He spotted what he was looking for almost instantly: an IP address. In fact, to Gambaryan’s

>surprise, every thumbnail image on the site seemed to display, within the site’s HTML, the IP >address of the server where it was physically hosted: 121.185.153.64.

That is indeed an opsec failure, along with using that same IP on an exchange. Which later turns out to be a computer aka the abuse website in the guys apartment.

[Kadin]

Well, he only ended up doing 6 months in jail -- maybe not the strongest motivation for "OPSEC".