ASN/CIDR
ASN
An autonomous system number (ASN) is a unique identifier that allows its autonomous system to exchange routing information with other systems.
The five regional Internet registries are:
African Network Information Center (AFRINIC)
American Registry for Internet Numbers (ARIN)
Asia-Pacific Network Information Centre (APNIC)
Latin American and Caribbean Network Information Centre (LACNIC)
Réseaux IP Européens Network Coordination Centre (RIPE NCC)
Obtaining an ASN (autonomous system number)
By Organization Name
ASN Lookup tools
- https://www.bigdatacloud.com/asn-lookup/{ASN}
- https://bgp.he.net/{ASN}
- https://ipinfo.io/{ASN}
- https://bgpview.io/asn/{ASN}
- https://whois.ipip.net/{ASN}
CIDR analysis
- https://whois.ipip.net/cidr/
- https://rdnsdb.com/
- https://www.robtex.com/
- https://bgp.tools/
- https://rapiddns.io/
CIDR range to IP list
# https://github.com/robertdavidgraham/masscan
masscan -iL list-of-cidrs -oG output --rate 10000 -p 80,8443,443,8080
Reverse CIDRs, IPs to domains
# https://github.com/projectdiscovery/tlsx
cat list | tlsx -san -cn -silent -resp-only