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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.

Processing... 0%
Parsing IPv4 address
Applying subnet mask
Computing host range
Done

Result

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.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Network address, broadcast address, subnet mask and wildcard mask for any IPv4/CIDR pair.
  • First and last usable host plus usable-host and total-address counts (2^(32−p) − 2 arithmetic).
  • IP class note for the entered address and a one-click copy of the full result summary.

Key Benefits

✓ One input pair — IP address and prefix — returns everything at once: network, broadcast, both masks, host range and address counts.
✓ Pure 32-bit integer math computed locally in your browser: no server round-trip, no lookup tables, correct for every prefix from /8 to /30.
✓ The IP class note explains what the first octet implies — classful history, loopback and reserved ranges — so the numbers come with context.

Use Cases

  • • Size a VLAN or office LAN: check how many usable hosts a /23 or /24 really gives before assigning the range.
  • • Fill in firewall or ACL rules with the exact network address, wildcard mask and broadcast for any IP/prefix pair.
  • • Practice CIDR arithmetic for networking exams by verifying your hand-calculated masks, ranges and host counts.