Turn any IPv4/CIDR like 192.168.10.34/24 into a clear network map: network address, mask, broadcast, host range and counts — all computed in your browser. Ready to decode the first piece?
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Why subnetting matters
Subnetting slices an IP block into smaller networks to simplify routing, isolate traffic, and reduce wasted addresses. One change to the prefix can reshape your addressing plan — want to see how?
CIDR and prefix lengths explained
CIDR uses a slash and a number to mark how many bits are network vs host. A larger prefix shrinks host space; a smaller one expands it. Next, watch that number turn into a mask.
Subnet masks and wildcard masks
A subnet mask translates the prefix into dotted decimal (for example 255.255.255.0). The wildcard mask flips those bits and helps with access rules. See how they reveal broadcast and host ranges.
Broadcast, host range & address counts
The network address sets host bits to zero and the broadcast sets them to one; usable hosts sit between. Use 2^(hostbits)-2 to count addresses and spot exceptions. Ready to test an address?
Read the full subnet guide
Step-by-step examples, an in-browser subnet calculator, and troubleshooting tips to map any IPv4 subnet instantly.