从APNIC下载中国IP，并挑出免费地址

apnic_pku.sh

#!/bin/bash

echo "Downloading IP list from APNIC...."
apniclist=`wget -q -O- http://ftp.apnic.net/stats/apnic/delegated-apnic-latest |grep "apnic|CN|ipv4|"`

echo "Checking blocks..."
rm cidr.txt
for ipblock in ${apniclist[@]}
do
    ip=`echo $ipblock | cut -d "|" -f4`
	block=`echo $ipblock | cut -d "|" -f5`
	testtrace=`traceroute -n -m 10 -w 1 $ip |awk 'NR>1{print $2}'|grep "162.105.252."`
	if [[ $testtrace == *"162.105.252."* ]]
	then
		block_cidr=`printf "%.0f\n" $(echo "32-l($block)/l(2)" |bc -l)`
		echo "block:$ip/$block_cidr available"
		echo "$ip/$block_cidr" >>cidr.txt
	else
		echo "block:$ip/$block_cidr unavailable"
	fi
	if [[ $ip == *"162.105."* ]]
	then
		echo "special block:$ip/$block_cidr available"
		echo "$ip/$block_cidr" >>cidr.txt
		continue
	fi
done

特殊处理了下162.105段，还没来得及测试