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asn: map hosts to their corresponding ASN via WHOIS
usage: asn.py [-h] [--host HOST] [--port PORT] [--ipv6] [--update] [--populate]
optional arguments:
-h, --help show this help message and exit
--host HOST IP address to listen on
--port PORT Port to listen on
--ipv6 Support queries for IPv6 hosts
--update Update dataset submodule and create/populate cache
--populate Create and populate cache from current dataset
INSTALL
$ git submodule init
$ git submodule update --recursive --remote
$ doas apk add py3-gitpython (Alpine)
$ ./asn.py --populate
$ ./asn.py --host 0.0.0.0 --port 4343
optional: forward traffic destined for port 43 (WHOIS default) back to 4343
$ iptables -A PREROUTING -t nat -p tcp --dport 43 -j REDIRECT --to-ports 4343
USAGE
$ whois -h whois.jordan.im 1.1.1.1
AS13335 AU CLOUDFLARENET 1.1.1.0/24
$ whois -h whois.jordan.im jordan.im
AS8943 GB Jump Networks Ltd 185.73.44.0/22
AS8943 GB Jump Networks Ltd 2001:ba8::/32
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