[kmlx]

my task was to rectify an issue in one of these crowd sourced lists of ad servers.

they were blocking a whole domain instead of blocking the ad-serving subdomain.

the issue was rectified, the main domain was replaced by the ad-serving subdomain.

[hathawsh]

Still, as pbhjpbhj suggested, if I were publishing both content and ads, I would consider publishing the ads on a different domain (not just a subdomain) to reduce technical issues. Domains with ugly names are very cheap.

[kmlx]

of course, and this is a valid proposal. but that was outside the remit.