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When I use that with the grep statement, I get:
38.101.48.170
38.101.48.0-38.101.48.255
146.20.0.0-146.20.255.255
What do you get?

Can you provide examples of valid entries that are removed?

Check if your grep has the -o option (what is your OS?). If so, you could try:
grep -Eo '([0-9]+\.){3}[0-9]+(-([0-9]+\.){3}[0-9]+)?' file