Produces a list of IP prefixes for a given routing AS number (ASN).

nmap --script targets-asn --script-args targets-asn.asn=ASN-NUMBER

Example:

$> nmap --script targets-asn --script-args targets-asn.asn=27693
Starting Nmap 7.91 ( https://nmap.org ) at 2023-03-17 20:08 UTC
Pre-scan script results:
| targets-asn:
|   27693
|     131.255.24.0/22
|     179.109.16.0/20
|     179.109.16.0/21
|     179.109.24.0/21
|     186.236.64.0/21
|     186.236.64.0/20
|     186.236.80.0/20
|     189.127.0.0/20
|     189.127.0.0/21
|     189.127.0.0/22
|     189.127.8.0/21
|     200.220.128.0/20
|     200.220.128.0/21
|_    200.220.136.0/21
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 1.14 seconds