Handy for firewall rules, ACLs, VLAN design and cloud VPC planning. Examples: 192.168.10.37/26 or 10.0.0.1 255.255.252.0
How it works
- Network = IP AND mask
- Broadcast = network OR (NOT mask)
- Usable hosts = 2^(32 − prefix) − 2 (/31 has 2, /32 has 1)
- Wildcard = 255.255.255.255 − mask
Results are estimates for reference only. Please confirm important decisions with the relevant authority or a professional.