sb.tech.org has one IP number , which also has a corresponding reverse pointer. tech.org, eb.tech.org, trulove.org, babythai.com, babythai.net and at least 61 other hosts use this as a mailserver. tech.org is a domain controlled by two nameservers at tech.org themselves. They are on different IP networks. Incoming mail for tech.org is handled by two mailservers also at tech.org. They are on different IP networks. tech.org has one IP number. sb.tech.org is hosted on a server in United States.