Summary
*.nic.pr has one IP number , which is the same as for
nic.pr, but the reverse is
elwyn2.nic.pr.
us.pr,
do.pr,
jm.pr,
tc.pr,
au.pr and at least 77 other hosts point to the same IP.
nic.pr is a domain controlled by five nameservers. Some of them are on the same IP network. Incoming mail for
nic.pr is handled by one mailserver at
nic.pr themselves.
*.nic.pr is hosted on a server in Puerto Rico.