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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: 54.81.112.7 more
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Request header
Size: 276 bytes more
Server date / time
June 19, 2018, 9:58 PM
Your quotes
SilverBench · Very nice website, saves me the trouble of installing test programs. Thank you!
- Anonymous
Server performance
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