Could you try visiting https://api.ipdata.co. I'm positive the API is up https://status.ipdata.co
% curl --header "Accept: application/json" https://api.ipdata.co
{"message": "Internal server error"}
Also, this request doesn't seem to return valid JSON: % curl --header "Accept: application/json" https://api.ipdata.co/224.0.0.1
224.0.0.1 is a bogon address.Please email me your IP address at jonathan at ipdata dot co and I'll help you out.