dhs.org
dns.lightningwirelabs.com
dnspark.com
+ domopoli.de
dtdns.com
dyndns.org
+ dyns.cx|net
dynu.com
easydns.com
+ enom.com
+ entrydns.net
freedns.afraid.org
+ myonlineportal.net
namecheap.com
no-ip.com
+ nsupdate.info
+ opendns.com
ovh.com
regfish.com
selfhost.de
udmedia.de
variomedia.de
zoneedit.com
+ zzzz.io
+
+Also supports DNS updates via the ISC BIND nsupdate utility.