This is a text-only version of the following page on https://raymii.org:
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Title       :   Get all IP ranges from an AS number
Author      :   Remy van Elst
Date        :   04-01-2015
URL         :   https://raymii.org/s/snippets/Get_all_IP_ranges_from_an_AS_number.html
Format      :   Markdown/HTML
---



One of my clients wanted to block a few social networking websites. Since they
have no IPv6 (yet) I figured the simplest way was to block access to the entire
IP range. This won't work for all the CDN networks they use, but it does get you
started.

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To find all the ranges beloning to an AS number you can query the
`whois.radb.net` server with the AS number.

For Facebook for example:



   whois -h whois.radb.net '!gAS32934'
   A1063
   204.15.20.0/22 69.63.176.0/20 66.220.144.0/20 66.220.144.0/21 69.63.184.0/21 69.63.176.0/21 74.119.76.0/22 69.171.255.0/24 173.252.64.0/18 69.171.224.0/19 69.171.224.0/20 103.4.96.0/22 69.63.176.0/24 173.252.64.0/19 173.252.70.0/24 31.13.64.0/18 31.13.24.0/21 66.220.152.0/21 66.220.159.0/24 69.171.239.0/24 69.171.240.0/20 31.13.64.0/19 31.13.64.0/24 31.13.65.0/24 31.13.67.0/24 31.13.68.0/24 31.13.69.0/24 31.13.70.0/24 31.13.71.0/24 31.13.72.0/24 31.13.73.0/24 31.13.74.0/24 31.13.75.0/24 31.13.76.0/24 31.13.77.0/24 31.13.96.0/19 31.13.66.0/24 173.252.96.0/19 69.63.178.0/24 31.13.78.0/24 31.13.79.0/24 31.13.80.0/24 31.13.82.0/24 31.13.83.0/24 31.13.84.0/24 31.13.85.0/24 31.13.86.0/24 31.13.87.0/24 31.13.88.0/24 31.13.89.0/24 31.13.90.0/24 31.13.91.0/24 31.13.92.0/24 31.13.93.0/24 31.13.94.0/24 31.13.95.0/24 69.171.253.0/24 69.63.186.0/24 31.13.81.0/24 179.60.192.0/22 179.60.192.0/24 179.60.193.0/24 179.60.194.0/24 179.60.195.0/24 185.60.216.0/22 45.64.40.0/22 204.15.20.0/22 69.63.176.0/20 69.63.176.0/21 69
63.184.0/21 66.220.144.0/20 69.63.176.0/20


For CloudVPS:



   whois -h whois.radb.net '!gAS35470'
   A248
   194.60.207.0/24 79.170.88.0/21 89.31.96.0/21 217.170.21.0/24 193.138.204.0/22 178.18.80.0/20 31.3.96.0/21 141.138.192.0/20 212.32.226.0/24 37.34.48.0/21 37.230.96.0/21 93.191.128.0/21 185.21.188.0/22 213.187.240.0/21 85.222.224.0/21 185.3.208.0/22


To find an AS number, you can query this whois server with the IP address.
Linode for example:



   $ whois -h whois.radb.net  178.79.155.1
   route:          178.79.128.0/18
   descr:          Linode-2
   origin:         AS15830
   mnt-by:         Linode-mnt
   changed:        [email protected] 20100510
   source:         RIPE
   remarks:        ****************************
   remarks:        * THIS OBJECT IS NOT VALID
   remarks:        * Please note that all personal data has been removed from this object.
   remarks:        * To view the original object, please query the RIPE Database at:
   remarks:        * http://www.ripe.net/whois
   remarks:        ****************************


And then their AS number:



   $ whois -h whois.radb.net '!gAS15830'
   A3937
   217.68.16.0/22 217.20.46.0/24 [...] 213.52.183.0/24 213.52.182.0/24 212.111.40.0/24


A block can then be issued with the following `iptables` command:



   iptables -A INPUT -d 217.68.16.0/22 -j DROP


Where `-d` is the destination you want to make unreachable.

If you have the `ipset` extension enabled you can create a set of all the
ranges:



   ipset -N blocked_nets nethash
   ipset -A blocked_nets 194.60.207.0/24
   ipset -A blocked_nets 79.170.88.0/21
   ipset -A blocked_nets 89.31.96.0/21
   ipset -A blocked_nets 217.170.21.0/24
   ipset -A blocked_nets 193.138.204.0/22
   ipset -A blocked_nets 178.18.80.0/20
   ipset -A blocked_nets 31.3.96.0/21
   ipset -A blocked_nets 141.138.192.0/20
   ipset -A blocked_nets 212.32.226.0/24
   ipset -A blocked_nets 37.34.48.0/21
   ipset -A blocked_nets 37.230.96.0/21
   ipset -A blocked_nets 93.191.128.0/21
   ipset -A blocked_nets 185.21.188.0/22
   ipset -A blocked_nets 213.187.240.0/21
   ipset -A blocked_nets 85.222.224.0/21
   ipset -A blocked_nets 185.3.208.0/22


And create the rules to filter based on the `ipset`, which is faster when you
have a large amount of IP's and ranges.



   iptables -I INPUT -m set --match-set blocked_nets src,dst -j DROP


  [1]: https://www.digitalocean.com/?refcode=7435ae6b8212

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