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Need to find with a reverse DNS lookup if the subdomain matches the domain that owns it.

I have a script that gets me the reverse DNS lookup for the IP but not quite sure how to check if the subdomain matches the domain that owns it.

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dig example.com then dig subdomain.example.com and compare? –  ceejayoz Feb 1 '13 at 20:45
    
how to find the domain that owns the IP ? –  ks_1010 Feb 1 '13 at 21:01
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nslookup #.#.#.#? –  ceejayoz Feb 1 '13 at 21:01
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What do you think "domain that owns the IP" means? Domains don't own IPs, so it's not clear what you're talking about. WHOIS by IP might be what you want. –  David Schwartz Feb 2 '13 at 2:02

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