diff --git a/wireguard-install.sh b/wireguard-install.sh
index a0f5b6f..c3f1bce 100644
--- a/wireguard-install.sh
+++ b/wireguard-install.sh
@@ -148,11 +148,13 @@ read -rp "Public interface: " -e -i "$SERVER_PUB_NIC" SERVER_PUB_NIC
 SERVER_WG_NIC="wg0"
 read -rp "WireGuard interface name: " -e -i "$SERVER_WG_NIC" SERVER_WG_NIC
 
-SERVER_WG_IPV4="10.66.66.1"
-read -rp "Server's WireGuard IPv4: " -e -i "$SERVER_WG_IPV4" SERVER_WG_IPV4
+until [[ "$SERVER_WG_IPV4" =~ ^([0-9]{1,3}\.){3}1$ ]]; do
+	read -rp "Server's WireGuard IPv4 [x.x.x.1]: " -e -i 10.66.66.1 SERVER_WG_IPV4
+done
 
-SERVER_WG_IPV6="fd42:42:42::1"
-read -rp "Server's WireGuard IPv6: " -e -i "$SERVER_WG_IPV6" SERVER_WG_IPV6
+until [[ "$SERVER_WG_IPV6" =~ ^([a-f0-9]{1,4}:){3,4}:1$ ]]; do
+	read -rp "Server's WireGuard IPv6 [x:x:x::1]: " -e -i fd42:42:42::1 SERVER_WG_IPV6
+done
 
 # Generate random number within private ports range
 SERVER_PORT=$(shuf -i49152-65535 -n1)