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

Results for*.eks.haystack.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-07-26T04:02:27.903	2019-07-15T00:00:00	2020-08-15T12:00:00	haystack.com	*.eks.haystack.com	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2019-07-26T04:02:27.903	2019-07-15T00:00:00	2020-08-15T12:00:00	haystack.com	*.eks.haystack.com	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2019-07-26T03:53:45.199	2019-07-15T00:00:00	2020-08-15T12:00:00	haystack.com	*.eks.haystack.com	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2019-07-26T03:53:45.199	2019-07-15T00:00:00	2020-08-15T12:00:00	haystack.com	*.eks.haystack.com	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2019-07-15T14:37:48.504	2019-07-15T00:00:00	2020-08-15T12:00:00	haystack.com	*.eks.haystack.com	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2019-07-15T14:37:48.504	2019-07-15T00:00:00	2020-08-15T12:00:00	haystack.com	*.eks.haystack.com	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2019-07-15T14:37:11.95	2019-07-15T00:00:00	2020-08-15T12:00:00	haystack.com	*.eks.haystack.com	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon
2019-07-15T14:37:11.95	2019-07-15T00:00:00	2020-08-15T12:00:00	haystack.com	*.eks.haystack.com	C=US, O=Amazon, OU=Server CA 1B, CN=Amazon