You can intercept both lines individually using their respective event handlers. The first is a notice and its information can be grabbed through the following method:
on ^*:notice:DCC Send *:?:{
echo $color(i) -ea $nick $4 is preparing to DCC Send you $3
haltdef
}
The ^ event prefix works with the /haltdef command to hide the notice you would normally see, should you want to hide it.
To grab the next set of information you simply use a CTCP event with "DCC Send" as matchtext:
ctcp *:DCC Send:*:{ echo $color(i) -ea $nick ( $+ $longip($4) $+ ) is now sending you $3 ( $+ $bytes($6).suf $+ ) on port $5 }
As you can see, I used that number you were referring to (211801718 in your case) and turned it into an IP Address. This is known as the long value of an IP address and you can convert it both ways using the $longip identifier.
Of course there is another method of parsing this information through means of the /debug -i command which I can offer information upon should you require it.
