diff --git a/nixos/default.nix b/nixos/default.nix
index 7ce3804f..d42bc3a8 100644
--- a/nixos/default.nix
+++ b/nixos/default.nix
@@ -55,6 +55,7 @@
     bat          # Like cat, but with syntax highlighting
     openssl      # Used to generate certs, random strings, etc
     tree         # CLI directory display software
+    nmap         # network mapping / discovery software
   ];
 
   # Select internationalisation properties.