ns.su29.ru has one IP number , which also has a corresponding reverse pointer. smtp.nsnbr.ru point to the same IP. cpx.ru, su29.ru, spfx.ru, dido.ru, ariol.ru and at least 48 other hosts use this as a nameserver. su29.ru is a domain controlled by two nameservers at su29.ru themselves. They are on different IP networks. Incoming mail for su29.ru is handled by one mailserver also at su29.ru. su29.ru has one IP number. ns.su29.ru is hosted on a server in Russian Federation.