Subnet /16: Mask 255.255.0.0, 65,534 Hosts, Address Range
Calculate the network address, broadcast, subnet and wildcard masks, host range and usable host count for any IPv4 address and CIDR prefix.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
A /16 prefix splits an IPv4 address exactly in half: the first 16 bits name the network and the remaining 16 bits number the hosts. It is the classic size for corporate and campus networks — 10.20.0.0/16 or 172.16.0.0/16 — and the whole private 192.168.0.0/16 block is itself one /16 that home equipment usually carves into smaller /24 segments.
The subnet mask is 255.255.0.0: sixteen ones, sixteen zeros. Sixteen host bits give 2^16 = 65,536 addresses, and after reserving the network and broadcast addresses 2^16 − 2 = 65,534 usable hosts remain. For 172.16.0.0/16 the usable range runs from 172.16.0.1 to 172.16.255.254, with 172.16.255.255 as broadcast.
This page opens the subnet calculator with /16 preselected: enter any IPv4 address to see its network address, broadcast, wildcard mask 0.0.255.255 and the exact host range. The math is pure 32-bit integer arithmetic performed entirely in your browser — no data leaves the page, and it works offline after the first load.
Example. 172.16.5.20/20 resolves to network 172.16.0.0, broadcast 172.16.15.255, and 4094 usable hosts.
Limit. Only IPv4 addresses and CIDR prefixes are parsed.