Represents an IPv4 Classless Inter-Domain Routing (CIDR) subnet block.
Normalizes the network base address upon initialization and provides subnet slicing.
Constructors
new(network :
IPv4Address, prefix :
Int32)
Initializes an IPv4CIDR with a network address and prefix (0..32).
Normalizes host bits in the network address to 0.
parse(cidr_str :
String) :
IPv4CIDR Parses a CIDR string (e.g. "192.168.1.0/24") into an IPv4CIDR struct.
Class methods
Computes the 32-bit subnet mask for a given prefix length.
Instance methods
broadcast
Returns the broadcast address for this subnet.
contains?(address :
IPv4Address) :
Bool Returns true if this CIDR block contains the specified IPv4Address.
contains?(other :
IPv4CIDR) :
Bool Returns true if this CIDR block completely encloses another IPv4CIDR.
first_usable
Returns the first usable host IP in the subnet.
host_at(offset :
Int) :
IPv4Address Calculates the IP address at a specific numerical offset within the subnet.
last_usable
Returns the last usable host IP in the subnet.
netmask
Returns the subnet mask as an IPv4Address.
overlaps?(other :
IPv4CIDR) :
Bool Returns true if this CIDR block overlaps with another IPv4CIDR.
Slices this subnet into child subnets of prefix new_prefix without intermediate allocations.
Outputs CIDR string representation (e.g. "192.168.1.0/24").
total_hosts
Computes total host addresses in this subnet (including network and broadcast).
usable_hosts
Computes usable host count taking RFC 3021 (/31) and /32 into account.
wildcard_mask
Returns the wildcard mask (inverted subnet mask) as an IPv4Address.