from twisted.names import client
from twisted.internet import reactor

def result(dns):
  print dns

d = client.lookupService('_xmpp-client._tcp.gmail.com')
d.addCallback(result)

reactor.run()

spike411@itsuki:~$ python pyco.py 
([<RR name=_xmpp-client._tcp.gmail.com type=SRV class=IN ttl=78377s auth=False>, <RR name=_xmpp-client._tcp.gmail.com type=SRV class=IN ttl=78377s auth=False>, <RR name=_xmpp-client._tcp.gmail.com type=SRV class=IN ttl=78377s auth=False>, <RR name=_xmpp-client._tcp.gmail.com type=SRV class=IN ttl=78377s auth=False>, <RR name=_xmpp-client._tcp.gmail.com type=SRV class=IN ttl=78377s auth=False>], [<RR name=gmail.com type=NS class=IN ttl=336493s auth=False>, <RR name=gmail.com type=NS class=IN ttl=336493s auth=False>, <RR name=gmail.com type=NS class=IN ttl=336493s auth=False>, <RR name=gmail.com type=NS class=IN ttl=336493s auth=False>], [<RR name=talk3.l.google.com type=A class=IN ttl=1764s auth=False>, <RR name=talk4.l.google.com type=A class=IN ttl=1764s auth=False>, <RR name=talk.l.google.com type=A class=IN ttl=130s auth=False>, <RR name=talk1.l.google.com type=A class=IN ttl=1764s auth=False>, <RR name=talk2.l.google.com type=A class=IN ttl=1764s auth=False>, <RR name=ns1.google.com type=A class=IN ttl=163650s auth=False>, <RR name=ns2.google.com type=A class=IN ttl=163650s auth=False>, <RR name=ns3.google.com type=A class=IN ttl=163650s auth=False>, <RR name=ns4.google.com type=A class=IN ttl=163650s auth=False>])

spike411@itsuki:~$ dig +short srv _xmpp-client._tcp.gmail.com
20 0 5222 talk2.l.google.com.
20 0 5222 talk3.l.google.com.
20 0 5222 talk4.l.google.com.
5 0 5222 talk.l.google.com.
20 0 5222 talk1.l.google.com.

spike411@itsuki:~$ dig srv _xmpp-client._tcp.gmail.com

; <<>> DiG 9.3.4 <<>> srv _xmpp-client._tcp.gmail.com
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48005
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 4, ADDITIONAL: 9

;; QUESTION SECTION:
;_xmpp-client._tcp.gmail.com.   IN      SRV

;; ANSWER SECTION:
_xmpp-client._tcp.gmail.com. 78353 IN   SRV     20 0 5222 talk1.l.google.com.
_xmpp-client._tcp.gmail.com. 78353 IN   SRV     20 0 5222 talk2.l.google.com.
_xmpp-client._tcp.gmail.com. 78353 IN   SRV     20 0 5222 talk3.l.google.com.
_xmpp-client._tcp.gmail.com. 78353 IN   SRV     20 0 5222 talk4.l.google.com.
_xmpp-client._tcp.gmail.com. 78353 IN   SRV     5 0 5222 talk.l.google.com.

;; AUTHORITY SECTION:
gmail.com.              336469  IN      NS      ns1.google.com.
gmail.com.              336469  IN      NS      ns2.google.com.
gmail.com.              336469  IN      NS      ns3.google.com.
gmail.com.              336469  IN      NS      ns4.google.com.

;; ADDITIONAL SECTION:
talk1.l.google.com.     1740    IN      A       72.14.253.125
talk2.l.google.com.     1740    IN      A       209.85.137.125
talk3.l.google.com.     1740    IN      A       216.239.51.125
talk4.l.google.com.     1740    IN      A       209.85.163.125
talk.l.google.com.      106     IN      A       209.85.137.125
ns1.google.com.         163626  IN      A       216.239.32.10
ns2.google.com.         163626  IN      A       216.239.34.10
ns3.google.com.         163626  IN      A       216.239.36.10
ns4.google.com.         163626  IN      A       216.239.38.10

;; Query time: 15 msec
;; SERVER: 192.168.16.1#53(192.168.16.1)
;; WHEN: Sun May 13 21:02:08 2007
;; MSG SIZE  rcvd: 488