IPAddr.ntop

# File tmp/rubies/ruby-3.3.0/lib/ipaddr.rb, line 113
def self.ntop(addr)
  case addr.size
  when 4
    addr.unpack('C4').join('.')
  when 16
    IN6FORMAT % addr.unpack('n8')
  else
    raise AddressFamilyError, "unsupported address family"
  end
end