diff --git a/include/functions b/include/functions
index 9626eb28..d13f8900 100644
--- a/include/functions
+++ b/include/functions
@@ -423,6 +423,8 @@
       {
         HOSTID="-"
         FIND=""
+        # Avoid some hashes (empty, only zeros)
+        BLACKLISTED_HASHES="6ef1338f520d075957424741d7ed35ab5966ae97 adc83b19e793491b1c6ea0fd8b46cd9f32e592fc"
         if [ ! "${SHA1SUMBINARY}" = "" -o ! "${OPENSSLBINARY}" = "" -o ! "${CSUMBINARY}" = "" ]; then
 
             case "${OS}" in
@@ -574,6 +576,15 @@
                         ReportException "GetHostID" "Can't create HOSTID as OS is not supported yet by this function"
                 ;;
             esac
+            # Remove HOSTID if it contains a default MAC address with a related hash value
+            if [ ! "${HOSTID}" = "" ]; then
+                for CHECKHASH in ${BLACKLISTED_HASHES}; do
+                    if [ "${CHECKHASH}" = "${HOSTID}" ]; then
+                        logtext "Result: hostid is a blacklisted value"
+                        HOSTID=""
+                    fi
+                done
+            fi
           else
             ReportException "GetHostID" "Can't create HOSTID as there is no SHA1 hash tool available (sha1, sha1sum, openssl)"
         fi