If you have it, I prefer to use dig, it gives you rather more
information

$ dig  razzledazzle.it

; <<>> DiG 9.6.0-APPLE-P2 <<>> razzledazzle.it
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61546
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 3, ADDITIONAL: 1

;; QUESTION SECTION:
;razzledazzle.it.               IN      A

;; ANSWER SECTION:
razzledazzle.it.        86400   IN      A       75.101.163.44
razzledazzle.it.        86400   IN      A       119.252.176.47
razzledazzle.it.        86400   IN      A       174.129.212.2
razzledazzle.it.        86400   IN      A       75.101.145.87

;; AUTHORITY SECTION:
razzledazzle.it.        86400   IN      NS      ns1.instradns.com.
razzledazzle.it.        86400   IN      NS      ns2.instradns.com.
razzledazzle.it.        86400   IN      NS      ns3.instradns.com.

;; ADDITIONAL SECTION:
ns3.instradns.com.      56009   IN      A       78.129.204.66

;; Query time: 130 msec
;; SERVER: 194.72.238.4#53(194.72.238.4)
;; WHEN: Tue Feb  9 10:38:07 2010
;; MSG SIZE  rcvd: 180
==========

Note that one of the four A records in there points to instra.com

$ host 119.252.176.47
47.176.252.119.in-addr.arpa domain name pointer redirector.instra.com.

So you have a one in four chance of getting the redirector, instead of
one of the heroku machines.

You need to remove those additional A records.

Also, the 86400's are the TTL (Time To Live) of the records, in
seconds.  86,400 seconds is 24 hours.  So any change you make to the
records will take up to that time to expire.

You should be able to change the TTL of the records from within your
registrars control panel.  Normally the first thing you do before
moving a server is drop the TTL to a few minutes (some registrars
require a minimum of 15 minutes), and wait until that change has
propagated.  Once that has filtered down through the DNS system, you
can change records and see the results consistently after that period,
minimizing any downtime or parallel running you might have to do.

DNS changes are one of the reasons you have to plan server moves quite
carefully in advance.

I hope that helps

Paul Leader
--
li: http://uk.linkedin.com/in/paulleader
cv: http://paulleader.co.uk/paul_leader_cv.pdf

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