using sed

I'm trying to use sed to append "/0.0.0.0" to the end of each line in a file

sed -i 's;$;/0.0.0.0;g' file.txt

problem is most of the time, "/0.0.0.0" is made as a new line after the existing ones, instead of being appended to the ends of the lines

so instead of:
text/0.0.0.0

I get:
text
/0.0.0.0

This is the file I'm trying to work with:
http://sites.google.com/site/rhershje5s/hosts.txt

It's an ad-blocking hosts file I'm trying to write a script to change into Dnsmasq form for my router.