I think they do have their own but sense I'm running tomato firmware I don't think i can use it. I'm gonna try to find a version or update with Tomato that I can possibly use. If not I will just use no-ip.
EDIT: Upon searching my router setting I found this origionally it said refresh every 28 days. However, if I change it to 0 it disables it. I think this might work. What the quickest way to see if it worked? Unplug my router?