While we are working on a comprehensive list of domains associated with DDNS traffic, here is a list of over 100 Dynamic DNS vendors with various levels of information available on the website.
http://www.dnsdynamic.org/
http://www.changeip.com/
http://www.no-ip.com/
http://freedns.afraid.org/
http://www.dyndns.com/
http://www.zonomi.com/
http://www.3322.org/
http://www.oray.com/
http://www.darsite.com/eng
http://www.ddns.nu/
http://dns2go.deerfield.com/
http://www.dhis.org/
http://www.dhs.org/
http://www.dns4biz.de/
http://www.dnsexit.com/
http://www.dnsmadeeasy.com/
http://www.dnspark.com/services/dynamicDNS.php
http://www.dtdns.com/
http://www.dyn.ee/
http://www.dynaccess.de
http://www.dynamip.com/
http://www.dyn.ro/
http://dyndns.dk/
http://www.dyndsl.com/
http://www.dynip.com/
http://dyns.cx/
http://www.dynup.net/
https://web.easydns.com/
http://www.homepc.org/
http://www.hldns.com/
http://www.microtech.co.gg/dns/
http://www.minidns.net/
http://www.myserver.org/
http://www.nettica.com/
http://www.ods.org/
http://www.planetdns.net/
http://www.powerdns.com/
http://www.prout.be/dns/
http://www.sitelutions.com/info/sldns
http://www.staticcling.org/
https://hub.turnkeylinux.org/
http://www.tzo.com/
http://www.whyi.org/
http://www.xname.org/
http://dns.widge.net/
http://www.worldwidedns.net/
http://activedns.co.za
https://www.dyndnsservices.com/tech.htm
http://zonomi.com
http://www.zerigo.com
http://www.yi.org
http://totaluptime.com/solutions/cloud-dns-service/
http://thebbs.org/dns/
http://www.thatip.com
https://system-ns.com
http://www.staticcling.org
http://spdns.de
http://www.planetdns.net
https://nubem.com/free-dynamic-dns/
http://www.noip.com
http://nicolas.cx
http://www.myserver.org/services.asp
http://myonlineportal.net
http://www.minidns.net
http://www.homepc.org
http://hn.org
https://www.easydns.com
http://www.dynup.net
http://www.dynu.com
http://www.dyns.cx
http://www.dynip.com
http://dynfree.com
http://dyndns.dk
http://dyndns.berlin/en/
http://www.dynamip.com
http://www.dynamicdomain.net
https://www.duiadns.net
http://www.duckdns.org
http://www.dtdns.com
http://domain-dns.com
http://www.dnsexit.com
http://www.dnsdynamic.org
http://www.dns2go.com
http://www.dnspark.com
http://www.dnsmadeeasy.com
http://www.bcu.cc
http://www.changeip.com
http://www.ddns.nu
http://dhcp.io
http://www.dhis.org
http://www.dhs.org
