These are a collection of free to use tools that you don't need to enter CAPTCHAs to use, have no ads on them, and have minimal or no rate limits.
Lookup Tools
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DNS lookup - DNS lookup (either forward or reverse). Put in an IP address to get the hostname and put in a hostname to get the IP.
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Who am I? - Shows HTTP headers with reverse DNS lookup
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Whois lookup - Works on domain names and IPv4 IPs. Additionally returns IPs of domain names. No CAPTCHA, full email addresses viewable, the only obstacle is you can only lookup one per minute.
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