I am sure that somebody have noticed this but 'fbi.gov' and 'cia.gov' and maybe otherz doesn't work if you write it without the 'www' while 'whitehouse.com' works without the 'www'

pleaz execuse me it this issue has been discussed before but I was surprised, what I know is that the 'www' doesn't matter, I don't know

thank you

Xenia