CIDR Network Calculator
Calculate the network address, broadcast, mask and host range from an IP in CIDR notation. An essential tool for network and subnet administration.
Rede + Broadcast
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CIDR network and broadcast addresses
Take an IPv4 address with a CIDR mask. The network address falls out of a bitwise host AND mask, while the broadcast address comes from host OR (~mask). Run 192.168.1.50/24 through it and you get mask 255.255.255.0, network 192.168.1.0, broadcast 192.168.1.255, with 192.168.1.1–192.168.1.254 left over for hosts. A /26 like 10.0.5.130/26 lands on network 10.0.5.128 and broadcast 10.0.5.191. CIDR (RFC 1519) did away with the old classful A/B/C model. Prefixes can now be aggregated, which keeps the global routing table from ballooning.
Applications and context
These two addresses show up all over the place: routing decisions via longest-prefix match, firewall and ACL rules that allow or deny by subnet, VLAN configuration on switches, OSPF/BGP advertisements, sizing a DHCP scope, on-prem segmentation. The broadcast in particular matters for protocols like WoL (Wake-on-LAN) and the legacy NetBIOS discovery that still lingers in some networks.
FAQ
Can the broadcast address be assigned to a host? No. Anything sent to it floods every host on the subnet, so it can't serve as a unicast address.
What is the difference between directed and limited broadcast? A directed broadcast aims at one specific subnet, say 192.168.1.255. The limited broadcast, 255.255.255.255, never leaves the local link.
Does IPv6 have a broadcast? No. It drops the concept entirely and leans on multicast groups instead, like ff02::1 for all nodes on the link.
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The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.