Querying The Hub for the external IP address withi...

As a programming challenge I'm trying to get the dynamic, external IP address of my broadband connection.
route -n -> returns routing information including the 192.168.1.254 gateway
nslookup "gateway" returns:
server: 192.168.1.254
address: 192.168.1.254#53
254.1.168.192.in-addr.arpa name BTHomehub.home.
254.1.168.192.in-addr.arpa name btbroadband.home.
254.1.168.192.in-addr.arpa name api.home.
using nslookup api.home (or any of the others) returns:
server: 192.168.1.254
address: 192.168.1.254#53
I want the external address not the internal. Can anyone help? I don't want to just use an ip finder website to get the address.
Thank You,
JvH

Thx for your help. Yes, I can login (via web page) and find the hubs external IP address but wanted to do it from within a script and wondered if it was possible without having to go down that road (login credentials, accessing right page, parsing the output).
route -n and looking for "G" under flags returns the gateway(s) and this gives me 192.168.1.254 which is the IP of the homehub, not my machine, so I'm querying the right device.
The annoying thing is; this used to work. I was running under Ubuntu 10, upgrading to 12 and it doesn't anymore. U12 has dnsmasq server which provides local DNS caching. I thought maybe this was the problem (it was handling the query from within the network and not asking the hub for the info) so I switched it off.
I'm going to try and create a USB boot drive with Ubuntu 10 on it (if I can) and see if the script still works from within that.
Finally, I'm not an expert and am happy for any useful criticism and advice. Tnx guys

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