[sgjohnson]

You could also use AAAA records to exfil data. Whole 128 bits at a time.

Of course there are far more practical ways of going about it.

[hnlmorg]

CNAME too. I dont know what the max field length for CNAME is though.

[comprev]

between 1 and 63 characters I think is the min/max

[wiml]

63 bytes per label, but the name can be longer than that.