<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">On Apr 26, 2016, at 9:30 AM, Joseph Goldman <<a href="mailto:joe@apcs.com.au" class="">joe@apcs.com.au</a>> wrote:<br class=""><div><blockquote type="cite" class=""><br class="Apple-interchange-newline"><div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); float: none; display: inline !important;" class="">Follow the AS Path - start with the network themselves, contact their NOC or whoever is on the whois, if no reasonable response, go to the next AS up, rinse and repeat, would be my approach. You are likely to hit a Tier 1 provider at some point and as long as you can prove you are the owner of the range (or acting on behalf of them) then one of the AS's on the way should block it.</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" class=""></div></blockquote></div><br class=""><div class="">Good luck getting a tier 1 to get itself involved in one of those fights.</div><div class=""><br class=""></div><div class=""> - mark</div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>