When you're looking at a company like CoStar, the question isn't really 'is it a scam?' — it's 'is this the right service for my real estate data needs?' CoStar is one of the most established names in commercial real estate information, and our analysis backs that up. The domain has been registered since 1994, the site is hosted on Akamai's enterprise infrastructure, and it passes all major security and reputation checks.
That said, even trusted sites have room for improvement. CoStar loads 53 external scripts, which is on the high side — while it's common for a data-heavy platform with analytics and marketing tools, it's worth noting that any third-party script can introduce risk. The site also doesn't set some common browser security headers that would protect against clickjacking or cross-site scripting. For a company that handles logins and sensitive property data, that's a small but real gap.
If you're a real estate professional considering a subscription, you can be confident that CoStar is a legitimate, long-standing business. For the safest experience, use a strong password and enable two-factor authentication if available. And if you ever run into a suspicious link or email supposedly from CoStar, double-check the sender — that's good advice for any website, no matter how trusted.