diff --git a/lib.nix b/lib.nix
index 5ce67c2..931de7c 100644
--- a/lib.nix
+++ b/lib.nix
@@ -31,7 +31,13 @@ let
   getDomainPostgresqlServer = domain:
     getHostFqdn entities.domains."${domain}".postgresql-server;
 
+  getSiteHosts = site:
+    attrNames (filterAttrs (_: hostOpts: hostOpts.site == site) entities.hosts);
+  getDomainHosts = domain:
+    attrNames
+    (filterAttrs (_: hostOpts: hostOpts.domain == domain) entities.domain);
 in {
   inherit getHostSite getHostDomain getHostRealm getHostFqdn getHostIpv4
-    getHostIpv6 getHostIps getDomainPostgresqlServer;
+    getHostIpv6 getHostIps getDomainPostgresqlServer getSiteHosts
+    getDomainHosts;
 }