Add host

pages/common/host.md

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+# host
+
+Lookup Domain Name Server
+
+- Lookup A, AAAA, and MX records of a domain
+
+`host {{domain}}`
+
+- Lookup a field (CNAME, TXT,...) of a domain
+
+`host -t {{field}} {{domain}}`
+
+- Reverse lookup an IP
+
+`host {{ip_address}}`