check port the open in webside is2c-dojo.net,is2c-dojo.com and spentera.com with informasion gathering

i will explain informasion gathering which i working as active and passive.
you can use toos backtrack in informasion gathering for see port whatever the open.example tools i use nmap and dnsenum but many tools who you use.
first : prior i working as active
there i will gathering link is2c-dojo.net

there we can see IP webside mentioned whatever  average in web browser mentioned port, state,service version is 80/tcp, open, http, google http 2.0 and use service info : OS/linux CPE:/o: linux:kernel
number two : i will also gathering link is2c-dojo.com


there ip webside mentiond in blocking our ping  become we con't see what port the opened
number three : i will also gathering link spentera.com with IP 74.81.66.104

there we can see IP webside mentioned whatever  average in web browser mentioned one of port, state,service version is 21/tcp   open   ftp

Furthermore i will clarify a passive
i or you  can use webside who.is then write is2c-dojo.net in box search there raises informasion hit IP , Registrar: CV. JOGJACAMP, Whois Server: whois.resellercamp.com,Referral URL: http://www.resellercamp.com
Status: clientTransferProhibited, and Expiration Date: 2012-12-22,Creation Date: 2011-12-22, Last Update Date: 2011-12-22, also name Domain Name: IS2C-DOJO.NET as client,Registrant client, status,privateproted.
near same as above webside who.is then write is2c-dojo.com as above
and 
near same as above i or you  can use webside who.is then write spentera.com as above the difference in client