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

Results for*.devst.io

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-05-15T21:21:17.638	2019-05-15T20:21:16	2019-08-13T20:21:16	devst.io	*.devst.io	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-15T21:21:17.638	2019-05-15T20:21:16	2019-08-13T20:21:16	devst.io	*.devst.io	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-15T21:21:16.992	2019-05-15T20:21:16	2019-08-13T20:21:16	devst.io	*.devst.io	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-05-15T21:21:16.992	2019-05-15T20:21:16	2019-08-13T20:21:16	devst.io	*.devst.io	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-21T01:19:58.642	2019-02-21T00:19:58	2019-05-22T00:19:58	revendedoroboticario.com.br	*.devst.io	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-21T01:19:58.642	2019-02-21T00:19:58	2019-05-22T00:19:58	revendedoroboticario.com.br	*.devst.io	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-21T01:19:58.092	2019-02-21T00:19:58	2019-05-22T00:19:58	revendedoroboticario.com.br	*.devst.io	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3
2019-02-21T01:19:58.092	2019-02-21T00:19:58	2019-05-22T00:19:58	revendedoroboticario.com.br	*.devst.io	C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3