It can be anything! An apex, subdomain, or even a URL.

Results for_sv1.bitrix24.com

Resolver

Location

TXT

Name	TTL	Value
_sv1.bitrix24.com	300	v=spf1 ip4:95.163.251.206 ip4:18.201.1.0 ip4:195.208.184.58 ip4:99.81.101.35 ip4:54.247.107.64 ip4:18.232.195.40 ip4:23.21.90.7 ip4:195.208.184.192 ip4:195.208.185.164 ip4:95.163.249.251 ip4:3.74.193.229 ip4:212.233.75.23 ip4:109.120.181.202 ~all