2 ms·

A bit off-track question (pls excuse): Is there way to find all domains with an A record pointing to a particular IP? Need it for some market research related

• tialaramex 5y ago
  In one sense, No. This question is effectively equivalent to questions like "Is there a way to find out everybody who likes cheese?". You're going to need to ask everybody, which is not practical. However, you can get fairly close, at some expense. You need "passive DNS" which is a product aggregated from large DNS services containing the set of DNS questions and answers they saw over some period (but not who asked the question) If you can afford to buy this, you can process that data (or your service provider might offer a neat database query that can do it) to find all the A questions whose answer was some particular dotted quad in some period (e.g. last 7 days). Since it's apparently a market research question you likely have a budget and will find this affordable. If it's "market research" only in the sense that somebody in your sales department was idly wondering, well, the answer is they need to pay $$$ to somebody.
• d0gsg0w00f 5y ago
  I have to do something similar to this at work to find out if people are still using thousands of AWS ELBs. The only way I found was to find the DNS guy and ask him for a CNAME extract from our external DNS provider.