diff --git a/public_suffix_list.dat b/public_suffix_list.dat
index 295ad3ef3..6505ac586 100644
--- a/public_suffix_list.dat
+++ b/public_suffix_list.dat
@@ -13594,6 +13594,15 @@ häkkinen.fi
 // Submitted by William Harrison <psl@hrsn.net>
 hrsn.dev
 
+// Harrison Network - PSL Sandbox : https://sandbox.psl.hrsn.dev
+// Submitted by William Harrison <psl@hrsn.net>
+!ignored.sub.wc.psl.hrsn.dev  
+!ignored.wc.psl.hrsn.dev
+!ignored.sub.psl.hrsn.dev  
+*.sub.wc.psl.hrsn.dev  
+*.wc.psl.hrsn.dev  
+sub.psl.hrsn.dev
+
 // Hashbang : https://hashbang.sh
 hashbang.sh