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Start your Tor client, then connect to the control port and ask for setevents STATUS_CLIENT.

Then torify wget 128.31.0.34

And on the control port you'll get

650 STATUS_CLIENT WARN DANGEROUS_SOCKS PROTOCOL=SOCKS5 ADDRESS=128.31.0.34:80

That warn event happens if you use the current socks5 variant, but you give it a fqdn that happens to be an IP address:

          if (string_is_valid_ipv4_address(req->address) ||
              string_is_valid_ipv6_address(req->address)) {
            log_unsafe_socks_warning(5,req->address,req->port,safe_socks);

This bug went in to Tor 0.2.6.2-alpha during commit 2862b769.

Bug noticed because of #10165 (moved).