That's a big question without any further information. There are plenty of universities that don't require a masters degree to get in, but it all depends on the program, the faculty, the university, your own experience etc.
You need to:
1) Determine what you want to study within computer science. I.e. what research projects do you want to undertake or what PhDs would you interview for?
2) Locate schools that have researchers who can supervise you or have PhDs you can interview for.
3) Determine the entrance requirements of those schools. Don't rule schools that provide an option to upgrade to a PhD program from a masters (that's what I did). You might start with a masters but finish with the PhD.