org.pn
edu.pn
net.pn

// post : https://www.iana.org/domains/root/db/post.html
post

// pr : http://www.nic.pr/index.asp?f=1
pr
com.pr
net.pr
org.pr
gov.pr
edu.pr
isla.pr
pro.pr
biz.pr
info.pr
name.pr
// these aren't mentioned on nic.pr, but on https://www.iana.org/domains/root/db/pr.html
est.pr
prof.pr
ac.pr

// pro : http://registry.pro/get-pro