diff --git a/blocklist.sh b/blocklist.sh
index 8b13789..5fa5518 100644
--- a/blocklist.sh
+++ b/blocklist.sh
@@ -1 +1,24 @@
+#!/bin/bash
 
+IPTABLES_PATH="/sbin/iptables"
+IPSET_PATH="/sbin/ipset"
+SORT_PATH="/usr/bin/sort"
+GREP_PATH="/bin/grep"
+BLOCKLISTDE="https://lists.blocklist.de/lists/all.txt"
+CRWALERS="https://isc.sans.edu/api/threatcategory/research?json"
+
+
+if [ -f $IPTABLES_PATH ]; then echo "iptables OK"; else echo "Cannot find [ iptables ]. Is it installed? Exiting"; exit 1; fi;
+#hash iptables 2>/dev/null || { echo >&2 "I require iptables but it's not installed.  Aborting."; exit 1; }
+#more in https://stackoverflow.com/questions/592620/how-can-i-check-if-a-program-exists-from-a-bash-script
+if [ -f $IPSET_PATH ]; then echo "ipset OK"; else echo "Cannot find [ ipset ]. Is it installed? Exiting"; exit 1; fi;
+if [ -f $SORT_PATH ]; then echo "sort OK"; else echo "Cannot find [ sort ]. Is it installed? Exiting"; exit 1; fi;
+if [ ! -f $GREP_PATH ]; then echo "Cannot find [ grep ]. Is it installed? Exiting"; exit 1; fi;
+
+echo "Downloading the most recent IP list from $BLOCKLISTDE ... and adding them to ipset blocklistde"
+curl -s https://lists.blocklist.de/lists/all.txt | grep -E -o "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" | xargs -L1 ipset add blocklistde
+echo "Downloading the most recent IP list from $BLOCKLISTDE ... and adding them to ipset crawlers"
+curl -s https://isc.sans.edu/api/threatcategory/research?json | jq '.[] | {ipv4}' | grep ':' | awk '{ print $2 }' | tr -d '"' | xargs -L1 ipset add crawler_bots
+echo "Adding the iptables rules..."
+iptables -I INPUT -m set --match-set crawler_bots src -j DROP
+iptables -I INPUT -m set --match-set blocklistde src -j DROP
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