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ebhs-129-33-164-73.tor.usf.ibm.com has one IP number , but the reverse is d.ca-servers.ca. ca05.cira.ca and d.ca-servers.ca point to the same IP. tor.usf.ibm.com is delegated to two nameservers, however two extra nameservers are listed in the zone. All nameservers are at tor.usf.ibm.com themselves. There are two duplicated IP numbers. Some of them are on the same IP network. ebhs-129-33-164-73.tor.usf.ibm.com is hosted on a server in United States.

ebhs-129-33-164-73.tor.usf.ibm.com
a records
 
+ 129.33.164.73 129.33.160.0/21 AS19152 d.ca-servers.ca
+ --- d.ca-servers.ca

tor.usf.ibm.com
ns-soa records
nm1.tor.usf.ibm.com
+ 129.33.184.20 129.33.184.0/21 AS19152 cadn101dn1.noc02.mebs.ihost.com
+ --- cadn101dn1.noc02.mebs.ihost.com
ns records
nm1.tor.usf.ibm.com
+ 129.33.184.20 129.33.184.0/21 AS19152 cadn101dn1.noc02.mebs.ihost.com
+ --- cadn101dn1.noc02.mebs.ihost.com
nm2.tor.usf.ibm.com
+ 129.33.184.21 129.33.184.0/21 AS19152 casm101sm1.noc02.mebs.ihost.com
+ --- casm101sm1.noc02.mebs.ihost.com
ns1.tor.usf.ibm.com
+ 129.33.184.20 129.33.184.0/21 AS19152 cadn101dn1.noc02.mebs.ihost.com
+ --- cadn101dn1.noc02.mebs.ihost.com
ns2.tor.usf.ibm.com
+ 129.33.184.21 129.33.184.0/21 AS19152 casm101sm1.noc02.mebs.ihost.com
+ --- casm101sm1.noc02.mebs.ihost.com
ip numbers of host
129.33.164.73
ptrs of ip numbers
d.ca-servers.ca
hostnames sharing ip with a-records
ca05.cira.ca
d.ca-servers.ca
domains using this as nameserver under another name
ca
ca-servers.ca
nameservers missing in parent delegation
nm1.tor.usf.ibm.com
nm2.tor.usf.ibm.com