I have come to realize that a few of the websites do seem to use virtual hosting, i.e. multiple domains per IP, and I put a bit more manual effort into looking at known possible IPs that had a relatively small number of domains in them.
This led either to finding a few new domains, or placing existing domains in the same IP as another domains.
From now on I'll consider any IP with more than two hits to be an "IP range".
Furthermore, I now found new hits on nearby IPs of 209.162.192.49 rastadirect.net which was given by Reuters, thus establishing a new IP range there. Apparently I had simply failed to check IPs around one of the possible reverse IPs for it. The new finds are:

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