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For example, I want to find all domain names that are forwarded to bankofamerica.com.

I know that fleetbank.com and fleetboston.com both forward to bankofamerica.com.

How can I find ALL domain names that forward to bankofamerica.com?

(note that I'm interested in the general case, just using bankofamerica.com as the example)

Andrew B
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user211836
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1 Answers1

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www.fleetbank.com and www.fleetboston.com are CNAME records that point to www.bankofamerica.com, among other DNS entries.

This is not possible to track down through normal means. CNAME records are not known about by the destination nameservers, unless the records are hosted by the same nameserver. (in which case the nameserver will also respond with the corresponding A record to speed up resolving)

;; QUESTION SECTION:
;www.fleetbank.com.             IN      A

;; ANSWER SECTION:
www.fleetbank.com.      3600    IN      CNAME   www.bankofamerica.com.
www.bankofamerica.com.  250     IN      CNAME   wwwui.ecglb.bac.com.
wwwui.ecglb.bac.com.    26      IN      A       171.161.199.100

In this scenario, www.bankofamerica.com resides on a different nameserver, and wwwwui.ecglb.bac.com resides on the same nameserver. It provides an A record hint for wwwui.ecglb.bac.com, but not www.bankofamerica.com. The nameservers for Bank of America have no knowledge that this CNAME exists.

Andrew B
  • 33,868