Summary
ns-ext.isc.org has one IP number , which also has a corresponding reverse pointer.
c.nic.so and
ns-ext.vix.com point to the same IP.
co.gy,
co.il,
ac.il,
co.zw,
org.np and at least 95 other hosts use this as a nameserver.
isc.org is a domain controlled by four nameservers. All of them are on different IP networks. Incoming mail for
isc.org is handled by two mailservers on different IP networks.
isc.org has one IP number.
ns-ext.isc.org is hosted on a server in United States.