End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
IPAddr#netmask
netmask
lib/ipaddr.rb
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# File tmp/rubies/ruby-3.1.3/lib/ipaddr.rb, line 463
def netmask
_to_string(@mask_addr)
end
Returns the netmask in string format e.g. 255.255.0.0