Zone apex
Start of authority
Email
Serial
2026012103
Refresh
3h
Retry
30m
Expire
7d
Negative cache TTL
1h
Question and response
Question
dig mx.jon.cz. SOA
Answer
The response has no answer records.
Authority
jon.cz. 3600 SOA ns.dns4.cz. hostmaster.active24.cz. 2026012103 10800 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0