go
ca02.cira.ca and ca.lax.icann.org point to 208.77.191.231.

ca.lax.icann.org
a records
 
+ 208.77.191.231 208.77.188.0/22 AS40528 f.ca-servers.ca
+ --- f.ca-servers.ca

ca02.cira.ca
a records
 
+ 208.77.191.231 208.77.188.0/22 AS40528 f.ca-servers.ca
+ --- f.ca-servers.ca

f.ca-servers.ca
ptr records
 
+ 208.77.191.231 208.77.188.0/22 AS40528 -
+ --- -
ip numbers of host
208.77.191.231
ptrs of ip numbers
f.ca-servers.ca
hostnames sharing ip with a-records
ca.lax.icann.org
ca02.cira.ca