How to easily obtain CIDR blocks of China Netcom, China Telecom, and China tietong

Sometimes it is necessary to know the IP address segment distribution of telecom, China Netcom, China tietong and other telecom operators as accurate as possible for cross-network segment engineering and applications. However, there are few materials available on the Internet, in addition, it is often the expiration date of N months ago ......
APNIC is an organization that manages IP Address Allocation in the Asia Pacific region. It has a rich and accurate IP Address Allocation library, and this information is also made public to the public! Next let's take a look at how to obtain the IP address distribution of some telecom operators in Linux:
Shell> wget http://ftp.apnic.net/apnic/dbase/tools/ripe-dbase-client-v3.tar.gz
Shell> tar xzvf ripe-dbase-client-v3.tar.gz
Shell> cd whois-3.1
Shell>./configure
Shell> make
After completing the above compilation and installation, we start to get the IP address segment;
China Netcom:
Shell>./whois3-h whois.apnic.net-l-I mb MAINT-CNCGROUP>/var/cnc
China Telecom:
Shell>./whois3-h whois.apnic.net-l-I mb MAINT-CHINANET>/var/chinanet
China tietong:
Shell>./whois3-h whois.apnic.net-l-I mb MAINT-CN-CRTC>/var/crtc
When you open the obtained file, you can see that the information in it is very detailed, and even the owner, phone number, email, and other information of each branch. If you want to get a neat and clean IP address segment file, you only need to use grep and awk for simple filtering :)

An Automatic Acquisition script for conversion from CU:Copy codeThe Code is as follows :#! /Bin/sh
# Auto get the IP Table
# Get the newest delegated-apnic-latest
Rm delegated-apnic-latest

If type wget
Then wget http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest
Else fetch http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest
Fi
Grep 'apnic | CN | ipv4 'delegated-apnic-latest | cut-f 4, 5-d' | '| tr' | ''' | while read ip cnt
Do
Mask = $ (bc <END | tail-1
Pow = 32;
Define log2 (x ){
If (x <= 1) return (pow );
Pow --;
Return (log2 (x/2 ));
}
Log2 ($ cnt );
END
)
Echo $ ip/$ mask ';'> cnnet

Resultext = 'whois $ ip@whois.apnic.net | grep-e ^ netname-e ^ descr-e ^ role-e ^ mnt-by | cut-f 2-d ': '| sed's /*//''

If echo $ resultext | grep-I-e 'railcom'-e 'crtc '-e 'railway'
Then echo $ ip/$ mask ';'> crc
Elif echo $ resultext | grep-I-e 'cncgroup'-e 'netcom'
Then echo $ ip/$ mask ';'> cnc
If echo $ resultext | grep-I-e 'chinanet '-e 'chinatel'
Then echo $ ip/$ mask ';'> telcom_acl
Elif echo $ resultext | grep-I-e 'unicom'
Then echo $ ip/$ mask ';'> unicom
Elif echo $ resultext | grep-I-e 'cmtnet'
Then echo $ ip/$ mask ';'> cmnet
Else
Echo $ ip/$ mask ';'> other_acl
Fi

Done