entropy.dns-oarc.netWeb-based DNS Randomness Test | DNS-OARC

Secondary Links Show — Secondary Links Hide — Secondary Links DSC DSC Grafana Mitigating DNS Denial of Service Attacks Primary Links Show — Primary Links Hide — Primary Links Member Portal Test Your DNS US-CERT’s Vulnerability Note VU#800113 describes deficiencies in the DNS protocol and implementations that can facilitate cache poisoning attacks. The answers from a poisoned nameserver cannot be trusted. You may be redirected to malicious web sites that will try to steal your identity or infect your computers with malware. Working exploits for this issue are already widely circulated! Upgrade your nameservers ASAP if you haven’t done so already! Additional details about these poisoning attacks are available in Dan Kaminsky ’s post of August 7, 2008. The essence of the problem is that DNS resolvers don’t always use enough randomness in their transaction IDs and query source ports. Increasing the amount of randomness increases the difficulty of a successful poisoning attack. This page exists to help you learn if your ISP’s nameservers are vulnerable to this type of attack. If you click on the button below, we will test the randomness of your ISP DNS resolver. The test takes a few seconds to complete. When its done you’ll see a page where the transaction ID and source port randomness will be rated either GREAT, GOOD, or POOR. If you see a POOR rating, we recommend that contact your ISP and ask if they have plans to upgrade their nameserver software. See porttest for another way to check your resolver from a Unix commandline. Hot News Items Introduction to DNS-OARC Joining and Participating in DNS-OARC OARC 33 Workshop, Online DNS-OARC Workshop Presentation Videos OARC on LinkedIn , GitHub Latest OARC Blog Posts Mitigating DNS Denial of Service Attacks DNS-OARC Conduct Policy Most Recent PostsContacting OARC Content Navigation Show — Content Navigation Hide — Content Navigation Services DNSVIZ OARC Mailing Lists ODVR Porttest Resolver Sharing Project TLDmon DNS Privacy Reply Size Test dlvtest Dont Probe AS112 Check My DNS Upcoming Workshops OARC 33, Online Past Workshops Software Development & Funding DNS Tools Catalog Data Catalog DSC RSSAC 002 DITL Zone File Repository Contributing Root Zone Archive About OARC Corporation - Board - Team OARC FAQ Mission Careers Programme Committee Contacting OARC Presentations Policies Search Search Tools Show — Tools Hide — Tools Recent content OARC’s Diamond Members Charter Communications ICANN VeriSign OARC’s Platinum Members Comcast Google Infoblox OARC’s Gold Members Akamai Nominet Oracle + Dyn RIPE NCC Salesforce OARC’s Silver Members AFNIC APNIC CIRA Cisco DENIC EURid Facebook ISC Neustar NIC.BR Public Interest Registry SIDN SWITCH OARC’s Bronze Members Afilias Alibaba Cloud Amazon Arnes auDA CentralNic CNNIC craigslist CZ.NIC Deteque DK Hostmaster DNS Belgium DNS.PT Farsight Fastly FICORA-Traficom GoDaddy Gransy IEDR InternetNZ ISOC ITESM - NIC-MX JPRS KISA/KRNIC LACNIC Microsoft MSK-IX Nameshield NetProtect NIC.AT NIC Chile No-IP Norid NS1 PowerDNS Shaw Communications SURFnet Swedish Internet Fnd Telus Tiggee Verizon DMS (OATH) zvelo OARC’s Blue Members Ethereum Name Service Hamburg TLD GmbH Hostmaster Ltd. ICSI ISOC-IL ISZT M3AAWG NASA Ames NIC.CR NLnet Labs PCH Quad9 RNIDS Snake Hill Labs University of Maryland USC/ISI OARC’s Supporters AFRINIC BRFidler BYU CAIDA CBN CENTR DePaul University DISA Double Shot Security Eesti Internet Feamster IDC IIFON JHU-APL LACTLD Michael Daly Mythic Beasts Netnod Nimbus NSRC - Univ. of Oregon ODU Ofcom PeeriX RTFM ShreshtaIT Sinodun SOX University Passo Fundo Univ. Grenoble Alpes US ARMY UTwente...