I think what you're looking for is the
nslookup -ls my.domain | find "80"
Note though that neither
grep 80 nor
find "80" will only return those entries ending in
80. They will both return entries that contain
80. If you truly only want entries that end in
80 it would be better to use
findstr with the
/e flag (matches the pattern if at the end of a line) as well as including a leading period (otherwise you might get something like 10.21.37.180).
nslookup -ls my.domain | findstr /e ".80"
You can also use Cygwin, which is "a large collection of GNU and Open Source tools which provide functionality similar to a Linux distribution on Windows."
nslookup -ls my.domain is giving you an error, then you might try
echo ls my.domain | nslookup | find "80"
or if you really only want the ones that end in
echo ls my.domain | nslookup | findstr /e ".80"