Look up an IP address
Find out who an IP address belongs to, convert IP address to DNS hostname, find the location of an IPv4 or IPv6 address on a map. Includes unix tools like ping, traceroute, nslookup, dig and others
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Robtex Domain/IP Lookup
Get detailed information about an Internet host. Enter an IP address (64.233.167.99), domain name (google.com), hostname (py-in-f99.google.com), or AS-number (AS15169) to get detailed dns information including reverse dns and forwards, whois information, who hosts the machine, and if it's listed in any RBLs (black lists). -
ARIN WHOIS Database Search
ARIN's WHOIS service gives contact and registration information for IP addresses, autonomous system numbers (ASN), organizations or customers that are associated with these resources, and related Points of Contact (POC). Doesn't include info on domain names or military networks. -
Wolfram|Alpha
Enter a question or calculation and Wolfram|Alpha uses its built-in algorithms and data to get the answer. A huge set of information and tons of models, methods, and algorithms that make it possible to compute whatever can be computed about anything -
DuckDuckGo
Nice, clean web search results with more privacy than Google, fewer ads and spam. A little known gem. -
just-ping
Check any Internet host's reachability and how much latency there is in communicating with it from 50 locations worldwide -
PSyon IP Address Converter
Convert an IP address from 8/8/8/8-bit dotted-decimal format (dot-seperated, like 127.0.0.1) to 8/8/16-bit, 8/24-bit, and 32-bit notations in decimal, octal and hexadecimal.