To find out which actual server is responding to your anycast queries, use the UNIX dig command, as in:

	dig @prisoner.iana.org hostname.as112.net any

The response should look something like this:

	;; ANSWER SECTION:
	$ORIGIN hostname.as112.net.
	@ 15S	TXT	"Internet Software Consortium, Inc." "Palo Alto, CA, USA"
		TXT	"See http://as112.net/ for more information."
		NS	blackhole-1.iana.org.
		NS	blackhole-2.iana.org.
		SOA	hazel.isc.org. hostmaster.isc.org. (
			2002050100	; serial
			1H		; refresh
			10M		; retry
			4w2d		; expiry
			15S )		; minimum

Where the SOA RR MNAME tells the host name of the answering anycast server, the SOA RR RNAME tells the e-mail address of the server's administrator, and some unordered TXT RR's tell other information which may be of interest. (Note: the whole response must fit in a 512 octet DNS/UDP datagram without depending on EDNS0 for slack.)

If one would like, one could also insert a geographic RR (LOC) to aid in future visualization projects, such as in this example:

$TTL    1W
@               IN      SOA     flo.gigafed.net. dns.ryouko.imsb.nrc.ca. (
                                1               ; serial number
                                1W              ; refresh
                                1M              ; retry
                                1W              ; expire
                                1W )            ; negative caching TTL

                        NS      blackhole-2.iana.org.
                        NS      blackhole-1.iana.org.

                        TXT     "See http://as112.net/ for more information."
                        TXT     "Federal GigaPOP" "Ottawa, Canada"
                        LOC     45 25 0.000 N 75 42 0.000 W 80.00m 1m 10000m 10m