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Sorry, we have no information about f.ca-servers.ca. ca-servers.ca is a domain controlled by five nameservers at ca-servers.ca themselves. All of them are on different IP networks. Incoming mail for ca-servers.ca is handled by three mailservers. Two of them are on the same IP network.

ca-servers.ca
ns-soa records
 
+   AS?  
+ ---  
ns records
a.ca-servers.ca
+ 192.228.27.11 192.228.27.0/24 AS27299 -
+ --- -
b.ca-servers.ca
+ 192.228.25.45 192.228.25.0/24 AS27299 -
c.ca-servers.ca
+ 192.228.28.9 192.228.28.0/24 AS13768 -
d.ca-servers.ca
+ 129.33.164.73 129.33.160.0/21 AS19152 -
e.ca-servers.ca
+ 192.228.30.9 192.228.30.0/24 AS13768 -
mx records
mail.cira.ca
+ 192.228.29.17 192.228.29.0/24 AS27299 -
+ --- -
mail01.tor.cira.ca
+ 192.228.26.135 192.228.26.0/24 AS27299 -
mail02.tor.cira.ca
+ 192.228.26.136 192.228.26.0/24 AS27299 -
ip numbers using ptr to this host
208.77.191.231