[fsh]

Any decent home router will automatically add the hostname of all DHCP(v6)-configured devices to its DNS service. You shouldn't need raw addresses at all.

[msh]

I have not seen any routers that do it, my ubiquity amplifi router certainly does not do that.

[lmm]

That's very strange given that every cheapo ISP router I've had does that. How did you confirm that it doesn't?