asnmap
Map autonomous system numbers and IP ranges
TLDR
Lookup ASN for IP
$ asnmap -ip [8.8.8.8]
Lookup domain$ asnmap -d [google.com]
Lookup by ASN number$ asnmap -a [AS15169]
Lookup by organization$ asnmap -org "[Google LLC]"
Lookup targets from a file$ asnmap -f [targets.txt]
Output CIDR ranges as JSON$ asnmap -a [AS15169] -json
SYNOPSIS
asnmap [-ip ip] [-d domain] [-a asn] [-org name] [options]
DESCRIPTION
asnmap quickly maps ASN (Autonomous System Number) information. It can lookup ASN from IP addresses, domains, or organization names, and return associated IP ranges.This is useful for reconnaissance, network mapping, and understanding organizational IP allocations.
PARAMETERS
-ip address
Lookup ASN for IP address-d domain
Lookup ASN for domain-a asn
Get IP ranges for ASN-org name
Search by organization name-f, -file file
Read targets to lookup from a file-j, -json
Display output in JSON format-c, -csv
Display output in CSV format-v6
Display IPv6 CIDR ranges in CLI output-silent
Display silent output (results only)-o, -output file
Write output to a file-up, -update
Update asnmap to the latest version
INSTALL
sudo dnf install asnmap
yay -S asnmap
brew install asnmap
nix profile install nixpkgs#asnmap
CAVEATS
Data comes from public sources and may not be current. Some organizations have multiple ASNs. Results should be verified for security work.
HISTORY
asnmap was developed by ProjectDiscovery as part of their security reconnaissance toolkit.