s5.plasa.com has one IP number , which also has a corresponding reverse pointer. onh.co.id, ptbju.com, jsm.co.id, cbk.co.id, ptpgl.com and at least 100 other hosts point to the same IP. plasa.com is a domain controlled by five nameservers at plasa.com themselves. All of them are on different IP networks. Incoming mail for plasa.com is handled by two mailservers at mail.plasa.com. They are on the same IP network. plasa.com has one IP number. s5.plasa.com is hosted on a server in Indonesia.