SpamCop is a free, community-based spam email reporting service provided by Cisco. It analyzes reported spam, extracts details about the sending IP, the URLs contained in the spam, and the networks over which the spam message has transited. Spamcop has also been faithfully listing hijacked IP’s hijacked IP address. The IP 146.0.53.17 is legitimately allocated to an organization named Logfont Ltd located in Dublin, Ireland, operating under Autonomous System (AS) AS51677.”]
Source: https://blog.talosintelligence.com/2014/09/help-my-ip-address-has-been-hijacked.html