Summary
3.21.196.in-addr.arpa is delegated to three nameservers, however all three delegated nameservers are missing in the zone. Two of them are on the same IP network.
ac.za,
co.zw,
co.ls,
mil.gh,
gov.za and at least 83 other hosts share nameservers with this domain.
21.196.in-addr.arpa is a domain controlled by four nameservers. All of them are on different IP networks.