Reporting abuse and spam
Use the APNIC Whois Database to obtain network contacts
You can use the APNIC Whois Database to obtain the registration details of the IP addresses APNIC has delegated. If the those IP addresses have been further assigned to other networks, you may also see the registration details of these assignments.
Contact the network
The admin-c and tech-c fields contain network contact information.
If you are able to obtain the registration details for the network in question, just click on either the admin-c or tech-c links of your search result shown in your browser for the contact information stored in these attributes.
Report invalid contacts
APNIC requires that organizations register valid contact details in the whois database, but we are not automatically notified if those details later cease to be valid.
Use the Report invalid contacts in the APNIC Whois Database form to report invalid contact details in the APNIC Whois Database. APNIC will take appropriate steps to try and have the database objects updated.
For further help on how to complain to the spammer's ISP, see: How to Complain to the Spammer's Provider.