diff --git a/ent/admn/ip.go b/ent/admn/ip.go
new file mode 100644
index 0000000..95f90c0
--- /dev/null
+++ b/ent/admn/ip.go
@@ -0,0 +1,15 @@
+package admn
+
+import (
+	"sourcecode.social/reiver/go-opt"
+	"sourcecode.social/reiver/go-nul"
+)
+
+// IP represents a Mastodon API "Admin::Ip".
+//
+// See:
+// https://docs.joinmastodon.org/entities/Admin_Ip/
+type IP struct {
+	IP     opt.Optional[string] `json:"ip"` // ip-address
+	UsedAt opt.Optional[string] `json:"used_at"`
+}