ASLOOKUP is the tool which searches the sequence of the AS number specified
with the parameter from IRR and indicates the first line of Description
of the AS Object.

Advantages:
You can search many AS Numbers at once.
You can use result of "show ip bgp" command with a CISCO router.
You can search to ARIN, JPNIC and APNIC whois database.
You can search AS Number from IP Addresses.

WWW: http://aslookup.bgpview.org/index-e.html