string issue

[rbt]

Either I'm crazy and I'm missing the obvious here or there is something 
wrong with this code. Element 5 of this list says it doesn't contain the 
string 255, when that's *ALL* it contains... why would it think that???

import time

ips = ['255.255.255.255', '128.173.120.79', '198.82.247.98', 
'127.0.0.1', '255.0.0.0', '255', '128.173.255.34']

for ip in ips:
     if '255' in ip:
         try:
             print "Removing", ip
             ips.remove(ip)
         except Exception, e:
             print e

print ips
time.sleep(5)

Someone tell me I'm going crazy ;)