ns2.gns.se has one IP number , which also has a corresponding reverse pointer. ns2.gortex.se and srv2-bazaar.ma point to the same IP. agh.se, 4it.se, apm.nu, gns.se, sql.nu and at least 100 other hosts use this as a nameserver. gns.se is a domain controlled by two nameservers at gns.se themselves. They are on the same IP network. Incoming mail for gns.se is handled by two mailservers also at gns.se. They are on the same IP network. gns.se has one IP number. ns2.gns.se is hosted on a server in Sweden.