diff --git a/back/srv/dashboard/add b/back/srv/dashboard/add
index 214ea24..220fe6e 100755
--- a/back/srv/dashboard/add
+++ b/back/srv/dashboard/add
@@ -70,10 +70,9 @@ hostnames="$(<<<"${peers}" awk '{print $1}' | cut -d'.' -f1)"
 ipv4s="$(<<<"${peers}" awk '{print $2}')"
 ipv6s="$(<<<"${peers}" awk '{print $3}')"
 usernumber="$(<<<"${ipv4s}" head -n1 | cut -d'.' -f3)"
-used_ips="$(<<<"${ipv4s}" cut -d'.' -f3)\n$(<<<"${ipv6s}" cut -d'.' -f3)"
-used_hostnumbers="$(<<<"${used_ips}" sort | uniq)"
-hostnumber=1
-while printf '%s' "${used_hostnumbers}" | grep "${hostnumber}"
+# Increment hostnumber from 1 until an unused one is found
+used_hostnumbers="$(<<<"${ipv4s}" cut -d'.' -f4 | sort | uniq)"
+hostnumber=1; while printf <<<"${used_hostnumbers}" grep "${hostnumber}"
 	do ((hostnumber++))
 done
 ipv4="${IPV4_NET%.*.*}.${usernumber}.${hostnumber}"