This is how hard it is to find the Internet Vikings spam IP ranges:
- Google “Internet Vikings International AB
- Find ipinfo.io in the serp and click it
- Scroll down to the “IP Address Ranges” list
As you can see it’s trivial for any search engine to just flag all IP numbers owned by Internet Vikings International AB since they just contain SEO spam anyway. However, the sites are certainly already automatically detected as SEO spam.