ntl
----------
82.0.0.0 - 82.31.255.255
80.0.0.0 - 80.7.255.255
217.137.0.0 - 217.137.249.255
81.96.0.0 - 81.111.255.255
213.104.0.0 - 213.107.255.255
62.252.0.0 - 62.255.255.255
194.168.0.0 - 194.168.255.255
Thats all the ranges I have, and it picks up every single ntl: user thats ever visited my site (a good 4,000+ already).
I have a tool available, where if you enter an IP address, it will show you what ISP the user is on! (As long as its a UK ISP)
Its available at:
www.dslzoneuk.net/isp_check.php