Summary
smtp.nyu.ch has one IP number , via cname to
ns0.ovh.net , which also has a corresponding reverse pointer.
mail.itg.gp,
pop3.nyu.ch,
mail.upg.ch,
mail.nyu.ch,
smtp.2in1.be and at least 100 other hosts point to the same IP.
nyu.ch is a domain controlled by two nameservers at
ovh.net. They are on different IP networks. Incoming mail for
nyu.ch is handled by three mailservers having a total of twelve IP numbers. All of them are on the same IP network.
nyu.ch has one IP number.
smtp.nyu.ch is hosted on a server in France even though the hostname implies Switzerland.