host-64-166-83.ubernet.com.bd was testing my security, so I thought I would out them. ubernet.com.bd is an IP telephone and ISP, out of Bangledesh.
This guy seems to have an older and a newer pattern. The older pattern starts with 220.47 and then appends the last 2 octets of the host name. The newer pattern starts with 45 and appends the last 3 octets of the host name.
host-161-148.ubernet.com.bd 184.108.40.206 220.127.116.11 – 18.104.22.168 22.214.171.124/21