Yes, gateway pages can work, but since you can only submit your root url, you need to make sure you "direct" the spider to pages you want it to see - either by some cgi process or by including hidden links on your your homepage.
Air_: Possibly detected a typo or two in your list:
220.127.116.11 won't resolve under nslookup rwhois: Edu.com
18.104.22.168 won't resolve under nslookup rwhois: Edu.com
22.214.171.124 won't resolve under nslookup rwhois: Worldstreet
You sure you weren't going to write "247" for the first two? (Though it beats me where that Worldstreet IP would fit in then.) So our spiderScouts dept. may be wrong in which case we would be glad to stand corrected: could you, if so, include some log file data, please?