Enter an IPv4 address with a prefix, for example 192.168.1.34/24, to see its network boundaries, mask and address range.
Calculated locally in your browser. Supports IPv4 prefixes /0 to /32.
The prefix tells you how many leading bits identify the network. In ordinary /0 to /30 subnets, the first address is the network address and the last is broadcast; usable host addresses lie between them. /31 and /32 are special: /31 is used for point-to-point links and /32 represents a single address.
The calculation follows RFC 4632 and the /31 exception in RFC 3021. It does not inspect your live router or firewall settings.
A /24 prefix means the first 24 bits of the IPv4 address identify the network and the remaining 8 bits identify addresses within it. The mask is 255.255.255.0.
The calculator applies the prefix bitmask. The network address is the first address of the block and the broadcast address the last, for ordinary prefixes from /0 to /30.
A /24 block has 256 addresses. In a typical subnet the network and broadcast addresses are reserved, leaving 254 usable host addresses.
RFC 3021 permits /31 on point-to-point links where both addresses can be used. A /32 represents a single IPv4 address with no host range.
No. The entire calculation runs in your browser and never sends the input to the splet.me application.
