Summary
ns1.is.nl has one IP number , which also has a corresponding reverse pointer.
is.nl,
a1.nu,
ci.nl,
21c.nl,
acp.nl and at least 100 other hosts use this as a nameserver.
is.nl is a domain controlled by two nameservers at
is.nl themselves. They are on different IP networks. Incoming mail for
is.nl is handled by one mailserver at
overalenaltijd.nl.
is.nl has one IP number.
ns1.is.nl is hosted on a server in Netherlands.