In the world of the glue that holds the web together, A is a DNS record that maps a domain name to an IPv4 address. AAAA is a DNS record that maps a domain name to an IPv6 address. A website without an AAAA can only be used over IPv4. (The opposite is also true, a website like http://ip6only.me/ that has only an IPv6 AAAA DNS record cannot be reached over IPv4.)

A user noticed that Reddit recently turned off its AAAA records, and posted asking why it was now an IPv4-only site.

Reddit used to have an AAAA (DNS IPv6-equivalent of an A record). They deleted the record. Users have noticed and posted.

> Yea, we found a couple of internal issues that need some debugging. Since it's a holiday week we decided to rollback. Better safe than sorry. > > It'll be back, don't worry.

Nothing to see here, really.

AAAA records are the type of DNS records for IPv6. I take this to mean that Reddit only has AA records (IPv4) addresses now.

They noted an issue with IPv6, and disabled it rather than troubleshoot it over the holiday weekend.

Looks like it defaults to old.Reddit.com now?

A type DNS records are used for looking up IPv4 addresses, AAAA records are for IPv6. This effectively takes Reddit off of the IPv6 internet and is a bit of a step backward.