Summary
6.223.128.in-addr.arpa is a domain controlled by four nameservers. Some of them are on the same IP network.
co.gy,
co.mz,
ac.mz,
co.ci,
nic.do and at least 74 other hosts share nameservers with this domain.
223.128.in-addr.arpa is delegated to four nameservers, however one extra nameserver is listed in the zone. Some of them are on the same IP network.