mx03.solcon.nl has one IP number , which also has a corresponding reverse pointer. ms1.solcon.nl and mxsol3.cgmv.nl point to the same IP. a2.nl, dch.nl, gmc.nl, gee.st, flb.nl and at least 100 other hosts use this as a mailserver. solcon.nl is a domain controlled by three nameservers at solcon.nl themselves. All of them are on the same IP network. Incoming mail for solcon.nl is handled by four mailservers also at solcon.nl. All of them are on the same IP network. solcon.nl has one IP number. mx03.solcon.nl is hosted on a server in Netherlands.