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This is literally the opposite of true. The OS-supplied resolver supports TCP DNS on all of the most popular desktop and mobile OSes and has for ages. I'd estim

This is literally the opposite of true. The OS-supplied resolver supports TCP DNS on all of the most popular desktop and mobile OSes and has for ages. I'd estimate a minimum of 90% of users have setups that support it, and I'm only hedging the 10% because I'm not sure how prevalent horribly misconfigured corporate firewalls are. By not supporting TCP DNS you are the odd one out.

toast0 5y ago
The OS supplied resolver may support it, but many networks block TCP DNS.
- tptacek 5y ago
  Many networks also block AAAA DNS, because middleboxes are stupid. That doesn't mean it's OK for libc not to implement AAAA.