diff --git a/pkgs/tools/networking/what/default.nix b/pkgs/tools/networking/what/default.nix
new file mode 100644
index 00000000000..943ee07fd42
--- /dev/null
+++ b/pkgs/tools/networking/what/default.nix
@@ -0,0 +1,30 @@
+{ lib, fetchFromGitHub, rustPlatform }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "what";
+  version = "0.5.1";
+
+  src = fetchFromGitHub {
+    owner = "imsnif";
+    repo = pname;
+    rev = version;
+    sha256 = "1q926w6c4hhf6gim6dn3jfcibgj5zbsgwnf5crmh8wv6a8fg6pxg";
+  };
+
+  cargoSha256 = "1rixpljqddwhryddzni5l6m4sjyn1krrj0ig0rzc701am7srhg3a";
+
+  meta = with lib; {
+    description = "A CLI utility for displaying current network utilization";
+    longDescription = ''
+      what sniffs a given network interface and records IP packet size, cross
+      referencing it with the /proc filesystem on linux or lsof on MacOS. It is
+      responsive to the terminal window size, displaying less info if there is
+      no room for it. It will also attempt to resolve ips to their host name in
+      the background using reverse DNS on a best effort basis.
+    '';
+    homepage = "https://github.com/imsnif/what";
+    license = licenses.mit;
+    maintainers = with maintainers; [ filalex77 ];
+    platforms = platforms.unix;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 921557ecd9c..ebe7ef61b77 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7307,6 +7307,8 @@ in
     libpsl = null;
   };
 
+  what = callPackage ../tools/networking/what { };
+
   which = callPackage ../tools/system/which { };
 
   woeusb = callPackage ../tools/misc/woeusb { };