Network Tools
Calculate subnets, address ranges and network masks, and inspect or format IP and MAC addresses. They are built for network engineers, sysadmins and students planning address space. These are pure calculators: they do not scan, probe or contact any host.
10 tools
Popular tools
CIDR Calculator
Type a network such as 192.168.1.0/24 and get every subnet detail at once: masks, host range, address counts and class.
Network Tools
Subnet Calculator
Divide a network such as 192.168.0.0/24 into 4 subnets, or into /26 blocks, and get a ready-to-use allocation table.
Network Tools
CIDR Range Calculator
Turn an arbitrary start–end IP range into the smallest exact set of CIDR blocks, or expand CIDR blocks into their first and last address.
Network Tools
IPv4 Address Validator
Paste one or many IPv4 addresses to see whether each is valid, why not if it is not, and what kind of address it is.
Network Tools
IPv6 Address Validator
Check an IPv6 address, then see its canonical short form, its full 32-digit form and what kind of address it is.
Network Tools
IP to Binary Converter
See any IP address as bits, for example 192.168.1.1 → 11000000.10101000.00000001.00000001.
Network Tools
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Frequently asked questions
What does the number after the slash in CIDR mean?
It is the prefix length: how many leading bits identify the network. For example /24 leaves 8 bits for hosts, giving 256 addresses, of which 254 are usable on a typical IPv4 subnet.
Do these tools scan or ping addresses?
No. They only do arithmetic on the values you type. Nothing is sent over the network, and the site deliberately offers no port scanners or similar utilities.
Is IPv6 supported?
The calculators handle common IPv4 subnet tasks and IP address formats. Where a tool supports IPv6, it is stated on that tool's page, and IPv6 prefixes are typically far larger than IPv4 ones.