If you need all ip prefixes announced by AS number for routing, filtering or info purposes, you can use whois client from Linux with args ‘-i origin -T route’
Example:
root@ns:~# whois AS9009 -i origin -T route |grep 'route:' route: 128.0.1.0/24 route: 138.99.211.0/24 route: 172.111.129.0/24 route: 172.111.130.0/24 route: 172.111.138.0/24 route: 172.111.140.0/24 route: 172.111.141.0/24 route: 172.111.148.0/24 route: 172.111.178.0/24 ..............
I use the default whois server: whois.ripe.net; You can bypass or change the whois server with ‘-h whois_server’.
For more filtered display:
root@ns:~# whois AS9009 -i origin -T route |grep 'route:' |grep 'route:' |awk '{print $2}'
128.0.1.0/24
138.99.211.0/24
172.111.129.0/24
172.111.130.0/24
172.111.138.0/24
172.111.140.0/24
....
Also, you can add as a bash function in ‘~/.bashrc’ or ‘~/.bash_profile’ file and use the command ‘routes ‘
function routes() {
whois $1 -i origin -T route|grep 'route:' | grep 'route:' |awk '{print $2}'
}
Example (after adding the function routes):
root@ns:~# routes AS9009 128.0.1.0/24 138.99.211.0/24 172.111.129.0/24 172.111.130.0/24 172.111.138.0/24 172.111.140.0/24 .......
More info: