Large organizations have recognizable IP address ranges registered in ARIN and other regional internet registries. A visit from IBM.com's IP range to a startup's website is visibly different from anonymous traffic in server logs. Even without named IP registration, IP-to-company mapping databases maintained by commercial services like MaxMind, IPinfo, and Clearbit allow websites to identify corporate visitors in real time through their server-side analytics.
Google Analytics, Clearbit Reveal, and similar products actively notify website owners about corporate visitors. Many B2B websites alert their sales teams when a specific named company visits pricing pages, accesses technical documentation, or spends extended time on specific product pages. These analytics products are specifically marketed as "identify your anonymous visitors" tools.
For competitive intelligence research that includes competitor pricing, product evaluations, and technical specification analysis, conducting research from a VPS accessed through Tor eliminates the corporate IP signature. The competitor's analytics see Tor exit traffic (or residential VPS traffic), not the researching company's IP range.