Some rules i use to get some IPv4 only sites to use the IPv6 CDNs they have, primarily reddit, twitch and the BBC. I currently use this with dnscrypt-proxy

IPv6_cloaking_rules.txt

## Reddit IPv6 Force
*.reddit.com dualstack.reddit.map.fastly.net

redditmedia.com dualstack.reddit.map.fastly.net
*.redditmedia.com dualstack.reddit.map.fastly.net


redditstatic.com dualstack.reddit.map.fastly.net
*.redditstatic.com dualstack.reddit.map.fastly.net

redd.it dualstack.reddit.map.fastly.net
*.redd.it dualstack.reddit.map.fastly.net



redditstatic.s3.amazonaws.com redditstatic.s3.dualstack.us-east-1.amazonaws.com
redditgifts.s3.amazonaws.com redditgifts.s3.dualstack.us-east-1.amazonaws.com
reddit-image.s3.amazonaws.com reddit-image.s3.dualstack.us-east-1.amazonaws.com

reddit-uploaded-media.s3-accelerate.amazonaws.com 2600:9000:2043:8000:f:70b9:3388:3ee1
d160uhrw1ev0bq.cloudfront.net 2600:9000:20fe:6a00:c:d3e7:bf80:93a1


## BBC
www.bbc.co.uk 2a04:4e42::81

## Twitch
# This only makes aspects of the site served over the CDN use IPv6, the twitch api is already IPv6. Chat and vieo will only use IPv4 at the moment
www.twitch.tv 2a04:4e42::726
www.twitch.tv 2a04:4e42:200::726
www.twitch.tv 2a04:4e42:400::726
www.twitch.tv 2a04:4e42:600::726

api.twitch.tv 2a04:4e42::726
api.twitch.tv 2a04:4e42:200::726
api.twitch.tv 2a04:4e42:400::726
api.twitch.tv 2a04:4e42:600::726

static.twitchcdn.net 2a04:4e42::726
static.twitchcdn.net 2a04:4e42:200::726
static.twitchcdn.net 2a04:4e42:400::726
static.twitchcdn.net 2a04:4e42:600::726

twitch.map.fastly.net 2a04:4e42::726
twitch.map.fastly.net 2a04:4e42:200::726
twitch.map.fastly.net 2a04:4e42:400::726
twitch.map.fastly.net 2a04:4e42:600::726

desktop-assets.twitchcdn.net 2a04:4e42::726

vod-storyboards.twitch.tv 2a04:4e42::726