关于APNIC
全球IP地址块被IANA(Internet Assigned Numbers Authority)分配给全球三大地区性IP地址分配机构，它们分别是：
ARIN (American Registry for Internet Numbers)
负责北美、南美、加勒比以及非洲撒哈啦部分的IP地址分配。同时还要给全球NSP(Network Service Providers)分配地址。
RIPE (Reseaux IP Europeens)
负责欧洲、中东、北非、西亚部分地区(前苏联)
APNIC (Asia Pacific Network Information Center)
负责亚洲、太平洋地区
APNIC IP地址分配信息总表的获取：
APNIC提供了每日更新的亚太地区IPv4，IPv6，AS号分配的信息表：http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest
该文件的格式与具体内容参见：ftp://ftp.apnic.net/pub/apnic/stats/apnic/README.TXT
通过该文件我们能够得到APNIC辖下IPv4地址空间的分配情况。
脚本获取IP地址
#!/bin/bash
wget -c http://ftp.apnic.net/stats/apnic/delegated-apnic-latestcat delegated-apnic-latest | awk -F '|' '/CN/&&/ipv4/ {print $4 "/" 32-log($5)/log(2)}' | cat > ipv4.txtcat delegated-apnic-latest | awk -F '|' '/CN/&&/ipv6/ {print $4 "/" 32-log($5)/log(2)}' | cat > ipv6.txtcat delegated-apnic-latest | awk -F '|' '/HK/&&/ipv4/ {print $4 "/" 32-log($5)/log(2)}' | cat > ipv4-hk.txtcat delegated-apnic-latest | awk -F '|' '/HK/&&/ipv6/ {print $4 "/" 32-log($5)/log(2)}' | cat > ipv6-hk.txt
执行脚本：
[root@cby cby]# ./ip.sh
--2021-04-29 12:17:13-- http://ftp.apnic.net/stats/apnic/delegated-apnic-latest
Resolving ftp.apnic.net (ftp.apnic.net)... 203.119.102.40, 2001:dd8:8:701::40
Connecting to ftp.apnic.net (ftp.apnic.net)|203.119.102.40|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 3352151 (3.2M) [text/plain]
Saving to: ‘delegated-apnic-latest’delegated-apnic-latest 100%[=============================================================>] 3.20M 61.3KB/s in 44s 2021-04-29 12:17:58 (74.0 KB/s) - ‘delegated-apnic-latest’ saved [3352151/3352151]
[root@cby cby]# ls
delegated-apnic-latest index.html ip.sh ipv4-hk.txt ipv4.txt ipv6-hk.txt ipv6.txt每日凌晨十二点十分会进行同步，若需要IP地址，可以访问如下地址：
http://aliyun.chenby.cn/
定时任务：
[root@cby cby]# crontab -l
10 0 * * * /www/server/cron/3ab48c27ec99cb9787749c362afae517 >> /www/server/cron/3ab48c27ec99cb9787749c362afae517.log 2>&1
10 0 * * * rm -rf /www/wwwroot/www.chenby.cn/cby/ipv4.txt /www/wwwroot/www.chenby.cn/cby/ipv4-hk.txt /www/wwwroot/www.chenby.cn/cby/ipv6.txt /www/wwwroot/www.chenby.cn/cby/ipv6-hk.txt /www/wwwroot/www.chenby.cn/cby/delegated-apnic-latest
11 0 * * * /www/wwwroot/www.chenby.cn/cby/ip.sh >> /home/ip.txt
