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There are definitely large organizations who run split horizon DNS because back in the mists of time they made poor choices and assigned IP addresses that were
by seanhunter 5y ago
There are definitely large organizations who run split horizon DNS because back in the mists of time they made poor choices and assigned IP addresses that were in the public address namespace (ie not a 10. or 192.168.1. etc) that they didn't own randomly to a large number of legacy subnets within their network. It's now too painful to migrate them, so they are a wart that has to be lived with until they eventually retire.
In the meantime they have to use split dns so they are able to keep things kinda working.
I have personally worked at least a couple of large orgs that have this setup (ie 100s or 1000s of ancient devices on internal networks squatting on what are actually public IPs).