ns4.tele3.us has no NS records.
NS records for this zone are defined at tele3.us.
NS records for this zone are defined at tele3.us.
Question and response
Question
dig ns4.tele3.us. NS
Answer
The response has no answer records.
Authority
tele3.us. 600 SOA ns1.tele3.cz. root.tele3.cz. 1763019164 28800 7200 1209600 43200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0