40.223.128.in-addr.arpa is a domain controlled by two nameservers on the same IP network. co.gy, co.mz, ac.mz, co.ci, nic.do and at least 52 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.