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

Results forwww.dev.str.st

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2017-04-12T23:32:05.836	2016-08-12T03:57:11	2019-08-12T03:57:11	dev.str.st	*.dev.str.st	C=IL, O=StartCom Ltd., OU=StartCom Certification Authority, CN=StartCom Class 3 OV Server CA
2016-08-12T04:47:59.749	2016-08-12T03:57:11	2019-08-12T03:57:11	dev.str.st	*.dev.str.st	C=IL, O=StartCom Ltd., OU=StartCom Certification Authority, CN=StartCom Class 3 OV Server CA
2016-08-12T04:09:29.987	2016-08-12T03:42:20	2019-08-12T03:42:20	*.dev.str.st	*.dev.str.st	C=IL, O=StartCom Ltd., OU=StartCom Certification Authority, CN=StartCom Class 3 OV Server CA
2016-08-11T13:13:17.436	2016-08-11T12:29:58	2019-08-11T12:29:58	*.dev.str.st	*.dev.str.st	C=IL, O=StartCom Ltd., OU=StartCom Certification Authority, CN=StartCom Class 3 OV Server CA
2016-08-11T13:03:00.874	2016-08-11T12:40:53	2019-08-11T12:40:53	*.dev.str.st	*.dev.str.st	C=IL, O=StartCom Ltd., OU=StartCom Certification Authority, CN=StartCom Class 3 OV Server CA