NetAddr.subnet_mask

You're seeing just the function subnet_mask, go back to NetAddr module for more information.
Link to this function

subnet_mask(ipv4_netaddr)

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Specs

subnet_mask(NetAddr.IPv4.t()) :: String.t()

Returns a human-readable address mask for ipv4_netaddr.

Examples

iex> NetAddr.subnet_mask %NetAddr.IPv4{address: <<192, 0, 2, 1>>, length: 24}
"255.255.255.0"