Yes, there are several, but dyndns.com is the largest one.
I have a paid account and have several host names. At my
remote QTH, I have different ones on four devices, since my
router sometimes does not update. This allows me to have
fallback host names in case I can't reach my station.
Anyway, I just deactivated it in the RRC-1258 and then
reactivated it again, now it finally updated. If anyone was
using dyndns before 2.26, they need to apparently do this
in order to make it work again.
Thanks & 73,
Mitch DJ0QN / K7DX