We've written a Firefox Extension that displays the AS Number of every
website visited along with some additional interesting information. All
data is updated daily and the prefix to AS number mapping is from a DFZ
You can download the extension here (a screenshot is available too):
If you have any feedback, comments or feature requests please contact
me either directly or at <asnumber at networx.ch>. We are working on
a lot more information on the RIR IP address delegations but need fully
access to all RIR's whois records for that. I've completed all paperwork
last week and we should receive full access in the near future.
Another thing I want to do is to show the number of RBL (Spamhaus, etc)
listed IPs per AS. Contacting those RBLs is rather difficult and any help
to discuss this directly with the RBL administrators is appreciated.
Another request: So far we've got data servers in Europe and USA but
none in Asia-Pacific. If you are able to host either a dedicated or
shared (vmware/xen) FreeBSD server in Japan or South Korea with excellent
inter-Asia connectivity please contact me directly.
BGP Experts, Traffic & Network Engineering Gurus