Summary
ns1.imp.ch has one IP number , which also has a corresponding reverse pointer.
ns.imp.ch point to the same IP.
bl.ch,
imp.ch,
ecv.ch,
v-1.ch,
smj.ch and at least 100 other hosts use this as a nameserver.
imp.ch is a domain controlled by four nameservers. Two of them are on the same IP network. Incoming mail for
imp.ch is handled by one mailserver at
imp.ch themselves.
ns1.imp.ch is hosted on a server in Switzerland.