iperf.ficolo.net has no TXT records.
Question and response
Question
dig iperf.ficolo.net. TXT
Answer
The response has no answer records.
Authority
ficolo.net. 3600 SOA dns1.ficolo.net. hostmaster.ficolo.net. 2020091400 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0