Find child domains of a URL

Question

Is there a way to find all the child domains of a URL?

e.g. parent url: www.example.com

Sample child domains:

• www.a.example.com
• www.abracadabra.example.com
• www.zoo.example.com

Answer 1

Only if the DNS server allows DNS zone Transfer, which almost no servers do for security reasons.

That is the only way.

Answer 2

Try doing site:websiteaddress.com in a Google search. It will let you find any subdomains that are public somewhere.

Answer 3

U can use diff online services. One of them is http://www.magic-net.info/dns-and-ip-tools.dnslookup