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The answer to a lookup arrives after the command has returned, so the console of the web interface never shows it. Plain "dns" now prints the name and the address, or whether it is still pending or failed.
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DNS
The switch can resolve host names to IPv4 addresses, for the NTP client and for anything else that is given a name instead of an address.
dns server <ip> [<ip>] # one or two servers, 0.0.0.0 removes them
dns lookup <name> # resolve a name and print the address
dns # show the servers and the last lookup
The answer to a lookup arrives after the command has returned, so it is
printed on the serial console and in the syslog. In the console of the web
interface, run dns afterwards to see it.
Without a configured server the resolver uses the one handed out by DHCP. Only address records are looked up; a query goes to the servers in turn, every two seconds, and gives up after six tries. A name that already is a dotted address is taken as it is, without a query.
The DNS servers are set in the Network card of the System page as well. Settings made there or on the console are kept only once the configuration is saved.