I finally got the output that I was looking for:
$ avahi-browse -kprt _apt_proxy._tcp +;eth0;IPv6;Squid\032deb\032proxy;_apt_proxy._tcp;local +;eth0;IPv4;Squid\032deb\032proxy;_apt_proxy._tcp;local =;eth0;IPv6;Squid\032deb\032proxy;_apt_proxy._tcp;local;top.local;fe80::6ef0:49ff:fe1f:bd4b;8000; =;eth0;IPv4;Squid\032deb\032proxy;_apt_proxy._tcp;local;top.local;fe80::6ef0:49ff:fe1f:bd4b;8000;
Note that the IPv4 address does not really look like a ipv4 address.
I finally got the output that I was looking for:
$ avahi-browse -kprt _apt_proxy._tcp IPv6;Squid\ 032deb\ 032proxy; _apt_proxy. _tcp;local IPv4;Squid\ 032deb\ 032proxy; _apt_proxy. _tcp;local IPv6;Squid\ 032deb\ 032proxy; _apt_proxy. _tcp;local; top.local; fe80::6ef0: 49ff:fe1f: bd4b;8000; IPv4;Squid\ 032deb\ 032proxy; _apt_proxy. _tcp;local; top.local; fe80::6ef0: 49ff:fe1f: bd4b;8000;
+;eth0;
+;eth0;
=;eth0;
=;eth0;
Note that the IPv4 address does not really look like a ipv4 address.