Bonjour Overview

The mDNS command can be used to list Address Book Server services on your network as shown in the following two examples

Display all Address Book Servers

polaris:~ alex$ mDNS -B _addressbookserver._tcp
Browsing for _addressbookserver._tcp
Talking to DNS SD Daemon at Mach port 5123
Timestamp     A/R Flags Domain                   Service Type             Instance Name
20:28:12.016  Add     1 local.                   _addressbookserver._tcp. AddressBookServer  (Polaris.local:8080)

and similarly display all HTTP/WEB server on your network

polaris:~ alex$ mDNS -B _http._tcp
Browsing for _http._tcp
Talking to DNS SD Daemon at Mach port 5123
Timestamp     A/R Flags Domain                   Service Type             Instance Name
20:35:38.844  Add     1 local.                   _http._tcp.              AddressBookServer (Polaris.local:8080)

Address Book Server publishes itself as both HTTP/WEB and Address Book Server service.