nameserver100.coolcom.com has no SRV records.
Question and response
Question
dig nameserver100.coolcom.com. SRV
Answer
The response has no answer records.
Authority
nameserver100.coolcom.com. 86400 SOA ns7.coolcom.com. root.nameserver100.coolcom.com. 2026010100 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0