As a network guy, you possinly need to check Internet Routing table for your IP range from time to time,especailly when you have some routing change in your network.

You can go to the link below and find one looking glass router to verify Internet routing information.

http://www.bgp4.as/looking-glasses

I like the AT&T one

$ telnet route-server.ip.att.net

username: rviews

password: rviews