You would need to monitor the IP's in the logs and see if there is a pattern, then block the IP range if necessary. Here is info on the ip in your OP.
General IP Information
IP: 192.187.125.187
Decimal: 3233512891
Hostname: 192.187.125.187
ISP: DataShack, LC
Organization: DataShack, LC
Services: Recently reported forum spam source. (344)
Type: Corporate
Assignment: Static IP
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