_ranges-asn4ip.sh: for IPv4 output ASN prefix range list (not definit…

…ive)

_ranges-asn4ip.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+if [ "$1" = "" ]; then
+  echo "List IPv4 ranges assigned to ASN for IP address";
+  echo "usage: $(basename $0) 192.168.1.12";
+  exit;
+fi;
+
+IP="$(echo "$1" | grep -E -o "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}")";
+
+# make sure IPv4 is at least valid
+C=$(echo "$IP" | wc -c);
+D=$(echo "$IP" | cut -d \. -f 4);
+if [ $C -lt 7 -o -z "$D" ]; then
+  echo "error: not IPv4: $IP";
+  exit;
+fi;
+
+A="$(curl -s https://freeapi.dnslytics.net/v1/ip2asn/$IP)";
+
+# check if the results are an announced IP address
+# and therefore has an ASN
+if [ "$(echo "$A" | grep true)" = "" ]; then
+  echo "announced: false";
+  exit;
+fi;
+
+CIDR="$(echo "$A" | cut -d \" -f 10)";
+ASN="$(echo "$A" | cut -d \" -f 13 | grep -E -o "[0-9]{3,6}")";
+
+curl -s "https://www.dan.me.uk/bgplookup?asn=$ASN" | grep '^<tr><td' | grep -v : | cut -d \  -f 4 ;
+