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Howdy,
I'd try some forensic DNS testing from a Linux shell.
Try out:
dig +trace sub1.domain.tld
host -a sub1.domain.tld
between those two you should be able to pin it down.
As for working insta-fast on subdomains, it depends on if you've ever looked up the sub before you added it. If you kick open a browser to subdomain.domain.tld before you add it, you're going to be left with a no host in your DNS cache, and likely your ISP's DNS cache. You won't be able to see the subdomain until the cache clears in some cases.
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