First do a nslookup to find out the public ip address of the org. nslookup sslwireless.com Now copy the public ip address and go to the following link. https://whatismyipaddress.com Paste your ip address here to find out the ASN number of yours. Copy that ASN number. Now go to this link: https://bgp.he.net In the search box, paste the ASN number and click search. Then go to the Prefixes v4 tab to see the public ip block of that organization. Avi