localhost subdomain wildcard

Question

I'm trying to have *.localhost pointing at 127.0.0.1.

I read this post which is quite recent and looks promising but dnsmasq can't bind port 53:

* Starting DNS forwarder and DHCP server dnsmasq                                                                                                              
 dnsmasq: failed to create listening socket for port 53: Adresse déjà utilisée

Does anyone know what's wrong or any other way of achieving? Thank you.

Answer 1

Another program is already using port 53. Maybe dnsmasq is already running or you have another DNS server installed.

What does

sudo fuser -v 53/tcp 53/udp

print?