CIDR / Subnet Calculator
Network engineering, firewall / routing config and address planning constantly need a CIDR (e.g. 10.0.0.0/22) broken down into network, broadcast, mask and usable hosts. This calculator does it instantly.
Note: a whole /24 is the so-called “C-class block.” In IP reputation, a C-block shares fate — if anyone in it spams or gets flagged as proxy / abuse, the whole block's reputation often suffers. This site lets you view the neighbors and risk profile of your IP's /24 directly.
Network192.168.1.0
Broadcast192.168.1.255
Netmask255.255.255.0
Wildcard0.0.0.255
Usable hosts192.168.1.1 – 192.168.1.254
Total addresses256
Usable count254
Computed locally, never uploaded. A /24 is one “C-class block” — if anyone in it spams or gets flagged, the whole block's reputation often suffers.
See my IP's /24 neighbors and reputation profile →