Tip Anonymous 11/03/2017 (Fri) 23:08:16 No. 11660 del
I did a correlation between the major Ad networks and have found that they converge to unique autonomous networks used for this purpose. Can you guess who controls it?

In order:
1. AS16509
2. AS15169
3. AS14618
4. AS54113
5. AS13335
6. AS14061

You can look for yourself on radb.net or using whois(1).
If you want to block those, use this command and put on your router firewall:

$ whois -h whois.radb.net -- '-i origin ASxxxxx' | grep ^route