diff --git a/pkgs/tools/networking/netmask/default.nix b/pkgs/tools/networking/netmask/default.nix
new file mode 100644
index 00000000000..52727163704
--- /dev/null
+++ b/pkgs/tools/networking/netmask/default.nix
@@ -0,0 +1,24 @@
+{ stdenv, fetchFromGitHub, autoreconfHook, texinfo }:
+
+stdenv.mkDerivation rec {
+  name = "netmask-${version}";
+  version = "2.4.3";
+
+  src = fetchFromGitHub {
+    owner = "tlby";
+    repo = "netmask";
+    rev = "v${version}";
+    sha256 = "1n6b9f60j7hfdbpbppgkhz3lr7pg963bxnfrq95i1d49xmx41f87";
+  };
+
+  buildInputs = [ texinfo ];
+  nativeBuildInputs = [ autoreconfHook ];
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/tlby/netmask;
+    description = "An IP address formatting tool ";
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.jensbin ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 5fa9d8cfe48..a2993b0647e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2658,6 +2658,8 @@ with pkgs;
 
   ipcalc = callPackage ../tools/networking/ipcalc {};
 
+  netmask = callPackage ../tools/networking/netmask {};
+
   ipv6calc = callPackage ../tools/networking/ipv6calc {};
 
   ipxe = callPackage ../tools/misc/ipxe { };