If your domain name is sensitive, replace it with an example domain name. The example domain names are specified in RFC 6761, section 6.5RFC 6761, section 6.5:
10.0.0.0/8
,172.16.0.0/12
,192.168.0.0/16
defined in RFC 1918RFC 1918100.64.0.0/10
defined in RFC 6598RFC 6598fc00::/7
defined in RFC 4193RFC 4193
192.0.2.0/24
,198.51.100.0/24
,203.0.113.0/24
defined in RFC 5737RFC 57372001:db8::/32
defined in RFC 3849RFC 3849