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Determine in php script if connected to internet?
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How do I know my IP address?
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Check if Internet Connection Exists with jQuery?
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Limiting sessions to one IP at a time
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How can I check if my DNS server is working?
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Allow Ubuntu Server Access only from specific IP's
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Block IPs if they access a resource
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How do I find out which program and process ID accesses a given IP address in Windows?
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Checking network connection
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Understanding IP . The requested URL was not found on this server
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Get Host-IPs of wireless network
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How to force Windows 7 to ask for a "fresh" IP address from DHCP server?
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Getting the IP address of the current machine using Java
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get region/city from ip
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How can I hide or show a different IP to a website?