.Dd March  24, 2022
.Dt WHOIS.JORDAN.IM 7
.Os "Alpine Linux"
.
.Sh NAME
.Nm asn
.Nd map hosts to their corresponding ASN over the WHOIS protocol

.Sh DESCRIPTION
.Lk https://git.jordan.im/asn "asn(1)"
is a WHOIS server which provides BGP announcement information sourced from
a local database cache generated using the
.Lk https://location.ipfire.org/ "IPFIRE"
dataset.
.Pp
.Sy whois.jordan.im
is a public
.Nm
instance for personal use.
.
.Sh USAGE
.
.Pp
.Lk https://man.openbsd.org/whois.1 "whois(1)"
can be used to communicate with the server using
.Ar --host
and
.Ar --port
arguments. Both hostnames and IP address are accepted.
.
.Bd -literal
$ whois -h whois.jordan.im google.com

IP Address               | AS Number | Country | AS Name | Announcement
-------------------------+-----------+---------+---------+--------------------
216.58.212.238           | 15169     | US      | GOOGLE  | 216.58.212.0/24
2a00:1450:4009:80b::200e | 15169     | IE      | GOOGLE  | 2a00:1450:4009::/48

$ whois -h whois.jordan.im 1.1.1.1

IP Address | AS Number | Country | AS Name       | Announcement
-----------+-----------+---------+---------------+-------------
1.1.1.1    | 13335     | AU      | CLOUDFLARENET | 1.1.1.0/24
.Ed
.
.Pp
If a hostname is provided, queries for each resolved A/AAAA record will be
returned. The dataset is regenerated daily to ensure response accuracy.

An instance of the
.Nm
HTTP component is hosted at
.Lk https://ip.jordan.im/ ip.jordan.im
which provides the requesting address's autonomous system information over HTTP
via JSON.
.
.Bd -literal
$ curl ip.jordan.im

{
  "host": "185.73.44.145",
  "hostname": "maple.jordan.im",
  "org": "AS8943 Jump Networks Ltd",
  "announcement": "185.73.44.0/22"
}
.Ed
.