NAME

asn — map hosts to their corresponding ASN over the WHOIS protocol

DESCRIPTION

asn(1) is a WHOIS server which provides BGP announcement information sourced from a local database cache generated using the IPFIRE dataset.

whois.jordan.im is a public asn instance for personal use.

USAGE

whois(1) can be used to communicate with the server using --host and --port arguments. Both hostnames and IP address are accepted.

$ whois -h whois.jordan.im google.com

AS Number | Country | AS Name | Announcement
----------+---------+---------+--------------------
15169     | US      | GOOGLE  | 142.250.0.0/15
15169     | IE      | GOOGLE  | 2a00:1450:4009::/48

$ whois -h whois.jordan.im 1.1.1.1

AS Number | Country | AS Name       | Announcement
----------+---------+---------------+-------------
13335     | AU      | CLOUDFLARENET | 1.1.1.0/24

If a hostname is provided, queries for each resolved A/AAAA record will be returned. The dataset is regenerated daily to ensure response accuracy.