Find your last resolver:
kdig TXT resolver-ip.dynamic.estada.ch
kdig TXT resolver-ip.dynamic.estada.ch @dynamic.estada.ch
Get the current time in UTC, with the remaining valid time beeing the remaining seconds of the minute.
kdig TXT time.dynamic.estada.ch
This will reply an IPv6 in the format:
fe80::Year:Month:Day:Hour:Minute:Second
where the numbers are formated to be read as decimal but are represented as hex
This will reply an IPv4 in the format:
127.Hour.Minute.Second
all in decimal
See who is increasing the TTL on the way by comparing a source query with your upstream resolver
kdig TXT dynamic.estada.ch
kdig TXT dynamic.estada.ch @dynamic.estada.ch
kdig TXT long.dynamic.estada.ch
Responds with a longer TTL
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