In reply to a post by jchamier:

In reply to a post by Oliver341:

Yes, automatic. The router also creates DNS records for smartphones connected to it

Its quite easy to do with open source software on Linux, but it is interesting the router designers actually bothered to do it!

At least a couple of the popular DNS forwarders that are used by the various Linux based consumer routers just have it built in (some of them also handle the DHCP side in the same daemon).

In reply to a post by Oliver341:

Yes, as I understand it the Sky router uses the hostname sent by the device's DHCP client to create the DNS record.

Yes, and that's how it works in corporate systems, when laptops move around the company's buildings the IP address changes, and as DHCP provides the new address, the DNS gets updated automatically.

This would be the same regardless of MAC address randomisation as long as the device does not randomise its hostname too!

I'm unclear how android devices are named, but macOS, Windows, Linux and iPhone/iPad are quite easy, and the name doesnt' change.

In reply to a post by jchamier:

In reply to a post by Oliver341:

Yes. Here I am querying my router's DNS server directly for the hostname of one of my PC's on the network:

And on my Asus, I get:
*** No internal type for both IPv4 and IPv6 Addresses (A+AAAA) records available for <hostname>.

All my Asus routers resolve internal IP's to hostnames and vice versa with an nslookup.

If you go to System Log / DHCP Leases, then you can see all the LAN devices connected and which ones have hostnames set.

Maybe it requires hostname and domain name to be set in the Asus for this to work (under LAN / LAN IP). It's a setting I always configure.
Not all devices have a hostname configured but any that are missing can be added via the DHCP manual assignment option

In reply to a post by j0hn83:

All my Asus routers resolve internal IP's to hostnames and vice versa with an nslookup.

Ahh interesting. My AC-AX88U isn't currently.

If you go to System Log / DHCP Leases, then you can see all the LAN devices connected and which ones have hostnames set.

Yeah, I have some devices with static MAC to IPv4 mapping set up.

Maybe it requires hostname and domain name to be set in the Asus for this to work (under LAN / LAN IP). It's a setting I always configure.

I don't have a domain, so I will do some research, maybe an invalid.local in my future.

In reply to a post by j0hn83:

All my Asus routers resolve internal IP's to hostnames and vice versa with an nslookup.

I now have this working, and its really simple when you know. Thank you!