centrex.msk.ru.itoolabs.net has no SRV records.
Question and response
Question
dig centrex.msk.ru.itoolabs.net. SRV
Answer
The response has no answer records.
Authority
msk.ru.itoolabs.net. 600 SOA dns1.itoolabs.net. noc.itoolabs.net. 2026020501 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0