mail2.comnet.nl has one IP number , which also has a corresponding reverse pointer. mail.brandingbeach.nl point to the same IP. any.nl, wxx.nl, wxx.com, 1649.com, 10787.ch and at least 100 other hosts use this as a mailserver. comnet.nl is a domain controlled by two nameservers at comnet.nl themselves. They are on different IP networks. Incoming mail for comnet.nl is handled by two mailservers also at comnet.nl. They are on different IP networks. mail2.comnet.nl is hosted on a server in Netherlands.