--- !ruby/object:RDoc::RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:RDoc::Markup::Flow::P 
  :body: Returns a new ipaddr built by masking IP address with the given prefixlen/netmask. (e.g. 8, 64, &quot;255.255.255.0&quot;, etc.)
full_name: IPAddr#mask
is_singleton: false
name: mask
params: (prefixlen)
visibility: public
