Tracking 2 uses scripts to collect an active IP from a large proxy list.
This means the IP for the challenge could possibly change daily.
If your answer isn't accepted, it's quite possible that:
1) You're entering details that have expired.
2) The IP comes from a country that can have various spellings. (i.e UK / United Kingdom / England)
If this happens and you're positive you've entered the correct details, please try the challenge again the next day.
I've read this, but the Ip hasnt changed. May I send you what I have?