ns4.strato.com has no NS records.
NS records for this zone are defined at strato.com.
NS records for this zone are defined at strato.com.
Question and response
Question
dig ns4.strato.com. NS
Answer
The response has no answer records.
Authority
strato.com. 3600 SOA karlsruhe.nic.xlink.net. hostmaster.cronon-isp.net. 2026022500 3600 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0