diff --git a/lib/numbers.sh b/lib/numbers.sh
new file mode 100644
index 0000000..c7612be
--- /dev/null
+++ b/lib/numbers.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+function generate_random_number {
+    local digits="$1"
+    tr -dc '0-9' </dev/urandom | head -c "$digits"
+}
+
+function find_mac {
+    id="${1}"
+    ip="${2}"
+
+    cat "/etc/dnsmasq.d/${id}.conf"  | grep "${ip}" | cut -d, -f 1 | cut -d= -f2
+}
\ No newline at end of file