Add whosthere

alex/core.nix

@@ -1,5 +1,11 @@
 { config, pkgs, inputs, ... }:
 
+let
+  unstable = import inputs.nixpkgs-unstable {
+    system = pkgs.stdenv.hostPlatform.system;
+    config.allowUnfree = true;
+  };
+in
 {
   home.username = "alex";
   home.homeDirectory = "/home/alex";
@@ -54,6 +60,7 @@
 
     # networking tools
     dig
+    unstable.whosthere
     # iperf3
     # dnsutils  # `dig` + `nslookup`
     # ldns # replacement of `dig`, it provide the command `drill`