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Free online network tools & utilities

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Subnet Calc - compute network subnet (dotted decimal or CIDR notation) mask for IP address or range, or vice versa. Determine number of hosts, broadcast address and host class.


8.8.8.8 or 192.0.34.164


Select 255.255.255.0 · /24 or 255.0.0.0 · /8

What is your IP? Whois?
IP: 54.198.247.44 more
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Request header
Size: 257 bytes more
Server date / time
September 20, 2017, 12:15 PM
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SilverBench · Great resource allowing us to compare our computers. Helps reassure me that I bought a great performing pc. Thanks!
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